ITSSTOOLS/core/dbobject.class.php

<?php
// Copyright (C) 2010-2017 Combodo SARL
//
//   This file is part of iTop.
//
//   iTop is free software; you can redistribute it and/or modify	
//   it under the terms of the GNU Affero General Public License as published by
//   the Free Software Foundation, either version 3 of the License, or
//   (at your option) any later version.
//
//   iTop is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//   GNU Affero General Public License for more details.
//
//   You should have received a copy of the GNU Affero General Public License
//   along with iTop. If not, see <http://www.gnu.org/licenses/>

/**
 * All objects to be displayed in the application (either as a list or as details)
 * must implement this interface.
 */
interface iDisplay
{

	/**
	 * Maps the given context parameter name to the appropriate filter/search code for this class
	 * @param string $sContextParam Name of the context parameter, i.e. 'org_id'
	 * @return string Filter code, i.e. 'customer_id'
	 */
	public static function MapContextParam($sContextParam);
	/**
	 * This function returns a 'hilight' CSS class, used to hilight a given row in a table
	 * There are currently (i.e defined in the CSS) 4 possible values HILIGHT_CLASS_CRITICAL,
	 * HILIGHT_CLASS_WARNING, HILIGHT_CLASS_OK, HILIGHT_CLASS_NONE
	 * To Be overridden by derived classes
	 * @param void
	 * @return String The desired higlight class for the object/row
	 */
	public function GetHilightClass();
	/**
	 * Returns the relative path to the page that handles the display of the object
	 * @return string
	 */
	public static function GetUIPage();
	/**
	 * Displays the details of the object
	 */
	public function DisplayDetails(WebPage $oPage, $bEditMode = false);
}

/**
 * Class dbObject: the root of persistent classes
 *
 * @copyright   Copyright (C) 2010-2016 Combodo SARL
 * @license     http://opensource.org/licenses/AGPL-3.0
 */

require_once('metamodel.class.php');
require_once('deletionplan.class.inc.php');
require_once('mutex.class.inc.php');


/**
 * A persistent object, as defined by the metamodel 
 *
 * @package     iTopORM
 */
abstract class DBObject implements iDisplay
{
	private static $m_aMemoryObjectsByClass = array();

  	private static $m_aBulkInsertItems = array(); // class => array of ('table' => array of (array of <sql_value>))
  	private static $m_aBulkInsertCols = array(); // class => array of ('table' => array of <sql_column>)
  	private static $m_bBulkInsert = false;

	private $m_bIsInDB = false; // true IIF the object is mapped to a DB record
	private $m_iKey = null;
	private $m_aCurrValues = array();
	protected $m_aOrigValues = array();

	protected $m_aExtendedData = null;

	private $m_bDirty = false; // Means: "a modification is ongoing"
										// The object may have incorrect external keys, then any attempt of reload must be avoided
	private $m_bCheckStatus = null; // Means: the object has been verified and is consistent with integrity rules
													//        if null, then the check has to be performed again to know the status
	protected $m_bSecurityIssue = null;
	protected $m_aCheckIssues = null;
	protected $m_aDeleteIssues = null;

	private $m_bFullyLoaded = false; // Compound objects can be partially loaded
	private $m_aLoadedAtt = array(); // Compound objects can be partially loaded, array of sAttCode
	protected $m_aTouchedAtt = array(); // list of (potentially) modified sAttCodes
	protected $m_aModifiedAtt = array(); // real modification status: for each attCode can be: unset => don't know, true => modified, false => not modified (the same value as the original value was set)
	protected $m_aSynchroData = null; // Set of Synch data related to this object
	protected $m_sHighlightCode = null;
	protected $m_aCallbacks = array();

	// Use the MetaModel::NewObject to build an object (do we have to force it?)
	public function __construct($aRow = null, $sClassAlias = '', $aAttToLoad = null, $aExtendedDataSpec = null)
	{
		if (!empty($aRow))
		{
			$this->FromRow($aRow, $sClassAlias, $aAttToLoad, $aExtendedDataSpec);
			$this->m_bFullyLoaded = $this->IsFullyLoaded();
			$this->m_aTouchedAtt = array();
			$this->m_aModifiedAtt = array();
			return;
		}
		// Creation of a brand new object
		//

		$this->m_iKey = self::GetNextTempId(get_class($this));

		// set default values
		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode=>$oAttDef)
		{
			$this->m_aCurrValues[$sAttCode] = $oAttDef->GetDefaultValue($this);
			$this->m_aOrigValues[$sAttCode] = null;
			if ($oAttDef->IsExternalField() || ($oAttDef instanceof AttributeFriendlyName))
			{
				// This field has to be read from the DB
				// Leave the flag unset (optimization) 
			}
			else
			{
				// No need to trigger a reload for that attribute
				// Let's consider it as being already fully loaded
				$this->m_aLoadedAtt[$sAttCode] = true;
			}
		}
	}

	// Read-only <=> Written once (archive)
	public function RegisterAsDirty()
	{
		// While the object may be written to the DB, it is NOT possible to reload it
		// or at least not possible to reload it the same way
		$this->m_bDirty = true;	
	}

	public function IsNew()
	{
		return (!$this->m_bIsInDB);
	}

	// Returns an Id for memory objects
	static protected function GetNextTempId($sClass)
	{
		$sRootClass = MetaModel::GetRootClass($sClass);
		if (!array_key_exists($sRootClass, self::$m_aMemoryObjectsByClass))
		{
			self::$m_aMemoryObjectsByClass[$sRootClass] = 0;
		}
		self::$m_aMemoryObjectsByClass[$sRootClass]++;
		return (- self::$m_aMemoryObjectsByClass[$sRootClass]);
	}

	public function __toString()
	{
		$sRet = '';
		$sClass = get_class($this);
		$sRootClass = MetaModel::GetRootClass($sClass);
		$iPKey = $this->GetKey();
		$sRet .= "<b title=\"$sRootClass\">$sClass</b>::$iPKey<br/>\n";
		$sRet .= "<ul class=\"treeview\">\n";
		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode=>$oAttDef)
		{
			$sRet .= "<li>".$oAttDef->GetLabel()." = ".$this->GetAsHtml($sAttCode)."</li>\n";
		}
		$sRet .= "</ul>";
		return $sRet;
	}
	
	// Restore initial values... mmmm, to be discussed
	public function DBRevert()
	{
		$this->Reload();
	}

	protected function IsFullyLoaded()
	{
		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode=>$oAttDef)
		{
			if (!$oAttDef->LoadInObject()) continue;
			if (!isset($this->m_aLoadedAtt[$sAttCode]) || !$this->m_aLoadedAtt[$sAttCode])
			{
				return false;
			}
		}
		return true;
	}

	/**
	 * @param bool $bAllowAllData DEPRECATED: the reload must never fail!
	 * @throws CoreException
	 */
	public function Reload($bAllowAllData = false)
	{
		assert($this->m_bIsInDB);
		$aRow = MetaModel::MakeSingleRow(get_class($this), $this->m_iKey, false /* must be found */, true /* AllowAllData */);
		if (empty($aRow))
		{
			throw new CoreException("Failed to reload object of class '".get_class($this)."', id = ".$this->m_iKey);
		}
		$this->FromRow($aRow);

		// Process linked set attributes
		//
		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode=>$oAttDef)
		{
			if (!$oAttDef->IsLinkSet()) continue;

			// Load the link information
			$sLinkClass = $oAttDef->GetLinkedClass();
			$sExtKeyToMe = $oAttDef->GetExtKeyToMe();

			// The class to target is not the current class, because if this is a derived class,
			// it may differ from the target class, then things start to become confusing
			$oRemoteExtKeyAtt = MetaModel::GetAttributeDef($sLinkClass, $sExtKeyToMe);
			$sMyClass = $oRemoteExtKeyAtt->GetTargetClass();

			$oMyselfSearch = new DBObjectSearch($sMyClass);
			$oMyselfSearch->AddCondition('id', $this->m_iKey, '=');

			$oLinkSearch = new DBObjectSearch($sLinkClass);
			$oLinkSearch->AddCondition_PointingTo($oMyselfSearch, $sExtKeyToMe);
			$oLinks = new DBObjectSet($oLinkSearch);

			$this->m_aCurrValues[$sAttCode] = $oLinks;
			$this->m_aOrigValues[$sAttCode] = clone $this->m_aCurrValues[$sAttCode];
			$this->m_aLoadedAtt[$sAttCode] = true;
		}

		$this->m_bFullyLoaded = true;
		$this->m_aTouchedAtt = array();
		$this->m_aModifiedAtt = array();
	}

	protected function FromRow($aRow, $sClassAlias = '', $aAttToLoad = null, $aExtendedDataSpec = null)
	{
		if (strlen($sClassAlias) == 0)
		{
			// Default to the current class
			$sClassAlias = get_class($this);
		}

		$this->m_iKey = null;
		$this->m_bIsInDB = true;
		$this->m_aCurrValues = array();
		$this->m_aOrigValues = array();
		$this->m_aLoadedAtt = array();
		$this->m_bCheckStatus = true;

		// Get the key
		//
		$sKeyField = $sClassAlias."id";
		if (!array_key_exists($sKeyField, $aRow))
		{
			// #@# Bug ?
			throw new CoreException("Missing key for class '".get_class($this)."'");
		}

		$iPKey = $aRow[$sKeyField];
		if (!self::IsValidPKey($iPKey))
		{
			if (is_null($iPKey))
			{
				throw new CoreException("Missing object id in query result (found null)");
			}
			else
			{
				throw new CoreException("An object id must be an integer value ($iPKey)");
			}
		}
		$this->m_iKey = $iPKey;

		// Build the object from an array of "attCode"=>"value")
		//
		$bFullyLoaded = true; // ... set to false if any attribute is not found
		if (is_null($aAttToLoad) || !array_key_exists($sClassAlias, $aAttToLoad))
		{
			$aAttList = MetaModel::ListAttributeDefs(get_class($this));
		}
		else
		{
			$aAttList = $aAttToLoad[$sClassAlias];
		}
		
		foreach($aAttList as $sAttCode=>$oAttDef)
		{
			// Skip links (could not be loaded by the mean of this query)
			if ($oAttDef->IsLinkSet()) continue;

			if (!$oAttDef->LoadInObject()) continue;

			unset($value);
			$bIsDefined = false;
			if ($oAttDef->LoadFromDB())
			{
				// Note: we assume that, for a given attribute, if it can be loaded,
				// then one column will be found with an empty suffix, the others have a suffix
				// Take care: the function isset will return false in case the value is null,
				// which is something that could happen on open joins
				$sAttRef = $sClassAlias.$sAttCode;

				if (array_key_exists($sAttRef, $aRow))
				{
					$value = $oAttDef->FromSQLToValue($aRow, $sAttRef);
					$bIsDefined = true;
				}
			}
			else
			{
				$value = $oAttDef->ReadValue($this);
				$bIsDefined = true;
			}

			if ($bIsDefined)
			{
				$this->m_aCurrValues[$sAttCode] = $value;
				if (is_object($value))
				{
					$this->m_aOrigValues[$sAttCode] = clone $value;
				}
				else
				{
					$this->m_aOrigValues[$sAttCode] = $value;
				}
				$this->m_aLoadedAtt[$sAttCode] = true;
			}
			else
			{
				// This attribute was expected and not found in the query columns
				$bFullyLoaded = false;
			}
		}
		
		// Load extended data
		if ($aExtendedDataSpec != null)
		{
			$aExtendedDataSpec['table'];
			foreach($aExtendedDataSpec['fields'] as $sColumn)
			{
				$sColRef = $sClassAlias.'_extdata_'.$sColumn;
				if (array_key_exists($sColRef, $aRow))
				{
					$this->m_aExtendedData[$sColumn] = $aRow[$sColRef];
				}
			}
		}
		return $bFullyLoaded;
	}
	
	public function Set($sAttCode, $value)
	{
		if ($sAttCode == 'finalclass')
		{
			// Ignore it - this attribute is set upon object creation and that's it
			return false;
		}
		
		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		if ($this->m_bIsInDB && !$this->m_bFullyLoaded && !$this->m_bDirty)
		{
			// First time Set is called... ensure that the object gets fully loaded
			// Otherwise we would lose the values on a further Reload
			//           + consistency does not make sense !
			$this->Reload();
		}

		if ($oAttDef->IsExternalKey())
		{
			if (is_object($value))
			{
				// Setting an external key with a whole object (instead of just an ID)
				// let's initialize also the external fields that depend on it
				// (useful when building objects in memory and not from a query)
				if ( (get_class($value) != $oAttDef->GetTargetClass()) && (!is_subclass_of($value, $oAttDef->GetTargetClass())))
				{
					throw new CoreUnexpectedValue("Trying to set the value of '$sAttCode', to an object of class '".get_class($value)."', whereas it's an ExtKey to '".$oAttDef->GetTargetClass()."'. Ignored");
				}

				foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sCode => $oDef)
				{
					if (($oDef->IsExternalField() || ($oDef instanceof AttributeFriendlyName)) && ($oDef->GetKeyAttCode() == $sAttCode))
					{
						$this->m_aCurrValues[$sCode] = $value->Get($oDef->GetExtAttCode());
						$this->m_aLoadedAtt[$sCode] = true;
					}
				}
			}
			else if ($this->m_aCurrValues[$sAttCode] != $value)
			{
				// Setting an external key, but no any other information is available...
				// Invalidate the corresponding fields so that they get reloaded in case they are needed (See Get())
				foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sCode => $oDef)
				{
					if (($oDef->IsExternalField() || ($oDef instanceof AttributeFriendlyName)) && ($oDef->GetKeyAttCode() == $sAttCode))
					{
						$this->m_aCurrValues[$sCode] = $oDef->GetDefaultValue($this);
						unset($this->m_aLoadedAtt[$sCode]);
					}
				}
			}
		}
		if($oAttDef->IsLinkSet())
		{
			if (is_null($value))
			{
				// Normalize
				$value = DBObjectSet::FromScratch($oAttDef->GetLinkedClass());
			}
			else
			{
				if ((get_class($value) != 'DBObjectSet') && !is_subclass_of($value, 'DBObjectSet'))
				{
					throw new CoreUnexpectedValue("expecting a set of persistent objects (found a '".get_class($value)."'), setting default value (empty list)");
				}
			}

			$oObjectSet = $value;
			$sSetClass = $oObjectSet->GetClass();
			$sLinkClass = $oAttDef->GetLinkedClass();
			// not working fine :-(   if (!is_subclass_of($sSetClass, $sLinkClass))
			if ($sSetClass != $sLinkClass)
			{
				throw new CoreUnexpectedValue("expecting a set of '$sLinkClass' objects (found a set of '$sSetClass'), setting default value (empty list)");
			}
		}

		$realvalue = $oAttDef->MakeRealValue($value, $this);

		$this->m_aCurrValues[$sAttCode] = $realvalue;
		$this->m_aTouchedAtt[$sAttCode] = true;
		unset($this->m_aModifiedAtt[$sAttCode]);

		foreach (MetaModel::ListMetaAttributes(get_class($this), $sAttCode) as $sMetaAttCode => $oMetaAttDef)
		{
			$this->Set($sMetaAttCode, $oMetaAttDef->MapValue($this));
		}

		// The object has changed, reset caches
		$this->m_bCheckStatus = null;

		// Make sure we do not reload it anymore... before saving it
		$this->RegisterAsDirty();

		// This function is eligible as a lifecycle action: returning true upon success is a must
		return true;
	}

	public function SetTrim($sAttCode, $sValue)
	{
		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		$iMaxSize = $oAttDef->GetMaxSize();
		if ($iMaxSize && (strlen($sValue) > $iMaxSize))
		{
			$sValue = substr($sValue, 0, $iMaxSize);
		}
		$this->Set($sAttCode, $sValue);
	}

	public function GetLabel($sAttCode)
	{
		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		return $oAttDef->GetLabel();
	}

	public function Get($sAttCode)
	{
		if (($iPos = strpos($sAttCode, '->')) === false)
		{
			return $this->GetStrict($sAttCode);
		}
		else
		{
			$sExtKeyAttCode = substr($sAttCode, 0, $iPos);
			$sRemoteAttCode = substr($sAttCode, $iPos + 2);
			if (!MetaModel::IsValidAttCode(get_class($this), $sExtKeyAttCode))
			{
				throw new CoreException("Unknown external key '$sExtKeyAttCode' for the class ".get_class($this));
			}

			$oExtFieldAtt = MetaModel::FindExternalField(get_class($this), $sExtKeyAttCode, $sRemoteAttCode);
			if (!is_null($oExtFieldAtt))
			{
				return $this->GetStrict($oExtFieldAtt->GetCode());
			}
			else
			{
				$oKeyAttDef = MetaModel::GetAttributeDef(get_class($this), $sExtKeyAttCode);
				$sRemoteClass = $oKeyAttDef->GetTargetClass();
				$oRemoteObj = MetaModel::GetObject($sRemoteClass, $this->GetStrict($sExtKeyAttCode), false);
				if (is_null($oRemoteObj))
				{
					return '';
				}
				else
				{
					return $oRemoteObj->Get($sRemoteAttCode);
				}
			}
		}
	}

	public function GetStrict($sAttCode)
	{
		if ($sAttCode == 'id')
		{
			return $this->m_iKey;
		}

		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);

		if (!$oAttDef->LoadInObject())
		{
			$value = $oAttDef->GetValue($this);
		}
		else
		{
			if (isset($this->m_aLoadedAtt[$sAttCode]))
			{
				// Standard case... we have the information directly
			}
			elseif ($this->m_bIsInDB && !$this->m_bDirty)
			{
				// Lazy load (polymorphism): complete by reloading the entire object
				// #@# non-scalar attributes.... handle that differently?
				$oKPI = new ExecutionKPI();
				$this->Reload();
				$oKPI->ComputeStats('Reload', get_class($this).'/'.$sAttCode);
			}
			elseif ($sAttCode == 'friendlyname')
			{
				// The friendly name is not computed and the object is dirty
				// Todo: implement the computation of the friendly name based on sprintf()
				// 
				$this->m_aCurrValues[$sAttCode] = '';
			}
			else
			{
				// Not loaded... is it related to an external key?
				if ($oAttDef->IsExternalField() || ($oAttDef instanceof AttributeFriendlyName))
				{
					// Let's get the object and compute all of the corresponding attributes
					// (i.e not only the requested attribute)
					//
					$sExtKeyAttCode = $oAttDef->GetKeyAttCode();
	
					if (($iRemote = $this->Get($sExtKeyAttCode)) && ($iRemote > 0)) // Objects in memory have negative IDs
					{
						$oExtKeyAttDef = MetaModel::GetAttributeDef(get_class($this), $sExtKeyAttCode);
						// Note: "allow all data" must be enabled because the external fields are always visible
						//       to the current user even if this is not the case for the remote object
						//       This is consistent with the behavior of the lists
						$oRemote = MetaModel::GetObject($oExtKeyAttDef->GetTargetClass(), $iRemote, true, true);
					}
					else
					{
						$oRemote = null;
					}
	
					foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sCode => $oDef)
					{
						if (($oDef->IsExternalField() || ($oDef instanceof AttributeFriendlyName)) && ($oDef->GetKeyAttCode() == $sExtKeyAttCode))
						{
							if ($oRemote)
							{
								$this->m_aCurrValues[$sCode] = $oRemote->Get($oDef->GetExtAttCode());
							}
							else
							{
								$this->m_aCurrValues[$sCode] = $oDef->GetDefaultValue($this);
							}
							$this->m_aLoadedAtt[$sCode] = true;
						}
					}
				}
			}
			$value = $this->m_aCurrValues[$sAttCode];
		}

		if ($value instanceof DBObjectSet)
		{
			$value->Rewind();
		}
		return $value; 
	}

	public function GetOriginal($sAttCode)
	{
		if (!array_key_exists($sAttCode, MetaModel::ListAttributeDefs(get_class($this))))
		{
			throw new CoreException("Unknown attribute code '$sAttCode' for the class ".get_class($this));
		}
		return $this->m_aOrigValues[$sAttCode];
	}

	/**
	 * Returns data loaded by the mean of a dynamic and explicit JOIN
	 */	 
	public function GetExtendedData()
	{
		return $this->m_aExtendedData;
	}
	
	/**
	 * Set the HighlightCode if the given code has a greater rank than the current HilightCode
	 * @param string $sCode
	 * @return void
	 */
	protected function SetHighlightCode($sCode)
	{
		$aHighlightScale = MetaModel::GetHighlightScale(get_class($this));
		$fCurrentRank = 0.0;
		if (($this->m_sHighlightCode !== null) && array_key_exists($this->m_sHighlightCode, $aHighlightScale))
		{
			$fCurrentRank = $aHighlightScale[$this->m_sHighlightCode]['rank'];
		}
				
		if (array_key_exists($sCode, $aHighlightScale))
		{
			$fRank = $aHighlightScale[$sCode]['rank'];
			if ($fRank > $fCurrentRank)
			{
				$this->m_sHighlightCode = $sCode;
			}
		}
	}
	
	/**
	 * Get the current HighlightCode
	 * @return string The Hightlight code (null if none set, meaning rank = 0)
	 */
	protected function GetHighlightCode()
	{
		return $this->m_sHighlightCode;
	}
	
	protected function ComputeHighlightCode()
	{
		// First if the state defines a HiglightCode, apply it
		$sState = $this->GetState();
		if ($sState != '')
		{
			$sCode = MetaModel::GetHighlightCode(get_class($this), $sState);
			$this->SetHighlightCode($sCode);
		}
		// The check for each StopWatch if a HighlightCode is effective
		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode => $oAttDef)
		{
			if ($oAttDef instanceof AttributeStopWatch)
			{
				$oStopWatch = $this->Get($sAttCode);
				$sCode = $oStopWatch->GetHighlightCode();
				if ($sCode !== '')
				{
					$this->SetHighlightCode($sCode);
				}
			}
		}
		return $this->GetHighlightCode();
	}

	/**
	 * Updates the value of an external field by (re)loading the object
	 * corresponding to the external key and getting the value from it
	 * 	 
	 * UNUSED ?
	 * 	 
	 * @param string $sAttCode Attribute code of the external field to update
	 * @return void
	 */
	protected function UpdateExternalField($sAttCode)
	{
		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		if ($oAttDef->IsExternalField())
		{
			$sTargetClass = $oAttDef->GetTargetClass();
			$objkey = $this->Get($oAttDef->GetKeyAttCode());
			// Note: "allow all data" must be enabled because the external fields are always visible
			//       to the current user even if this is not the case for the remote object
			//       This is consistent with the behavior of the lists
			$oObj = MetaModel::GetObject($sTargetClass, $objkey, true, true);
			if (is_object($oObj))
			{
				$value = $oObj->Get($oAttDef->GetExtAttCode());
				$this->Set($sAttCode, $value);
			}
		}
	}
	
	public function ComputeValues()
	{
	}

	// Compute scalar attributes that depend on any other type of attribute
	final public function DoComputeValues()
	{
		// TODO - use a flag rather than checking the call stack -> this will certainly accelerate things

		// First check that we are not currently computing the fields
		// (yes, we need to do some things like Set/Get to compute the fields which will in turn trigger the update...)
		foreach (debug_backtrace() as $aCallInfo)
		{
			if (!array_key_exists("class", $aCallInfo)) continue;
			if ($aCallInfo["class"] != get_class($this)) continue;
			if ($aCallInfo["function"] != "ComputeValues") continue;
			return; //skip!
		}
		
		// Set the "null-not-allowed" datetimes (and dates) whose value is not initialized
		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode => $oAttDef)
		{
			// AttributeDate is derived from AttributeDateTime
			if (($oAttDef instanceof AttributeDateTime) && (!$oAttDef->IsNullAllowed()) && ($this->Get($sAttCode) == $oAttDef->GetNullValue()))
			{
				$this->Set($sAttCode, date($oAttDef->GetInternalFormat()));
			}
		}
		
		$this->ComputeValues();
	}

	public function GetAsHTML($sAttCode, $bLocalize = true)
	{
		$sClass = get_class($this);
		$oAtt = MetaModel::GetAttributeDef($sClass, $sAttCode);

		if ($oAtt->IsExternalKey(EXTKEY_ABSOLUTE))
		{
			//return $this->Get($sAttCode.'_friendlyname');
			$sTargetClass = $oAtt->GetTargetClass(EXTKEY_ABSOLUTE);
			$iTargetKey = $this->Get($sAttCode);
			if ($iTargetKey < 0)
			{
				// the key points to an object that exists only in memory... no hyperlink points to it yet
				return '';
			}
			else
			{
				$sHtmlLabel = htmlentities($this->Get($sAttCode.'_friendlyname'), ENT_QUOTES, 'UTF-8');
				return $this->MakeHyperLink($sTargetClass, $iTargetKey, $sHtmlLabel);
			}
		}

		// That's a standard attribute (might be an ext field or a direct field, etc.)
		return $oAtt->GetAsHTML($this->Get($sAttCode), $this, $bLocalize);
	}

	public function GetEditValue($sAttCode)
	{
		$sClass = get_class($this);
		$oAtt = MetaModel::GetAttributeDef($sClass, $sAttCode);

		if ($oAtt->IsExternalKey())
		{
			$sTargetClass = $oAtt->GetTargetClass();
			if ($this->IsNew())
			{
				// The current object exists only in memory, don't try to query it in the DB !
				// instead let's query for the object pointed by the external key, and get its name
				$targetObjId = $this->Get($sAttCode);
				$oTargetObj = MetaModel::GetObject($sTargetClass, $targetObjId, false); // false => not sure it exists
				if (is_object($oTargetObj))
				{
					$sEditValue = $oTargetObj->GetName();
				}
				else
				{
					$sEditValue = 0;
				}					
			}
			else
			{
				$sEditValue = $this->Get($sAttCode.'_friendlyname');
			}
		}
		else
		{
			$sEditValue = $oAtt->GetEditValue($this->Get($sAttCode), $this);
		}
		return $sEditValue;
	}

	public function GetAsXML($sAttCode, $bLocalize = true)
	{
		$oAtt = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		return $oAtt->GetAsXML($this->Get($sAttCode), $this, $bLocalize);
	}

	public function GetAsCSV($sAttCode, $sSeparator = ',', $sTextQualifier = '"', $bLocalize = true, $bConvertToPlainText = false)
	{
		$oAtt = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		return $oAtt->GetAsCSV($this->Get($sAttCode), $sSeparator, $sTextQualifier, $this, $bLocalize, $bConvertToPlainText);
	}

	public function GetOriginalAsHTML($sAttCode, $bLocalize = true)
	{
		$oAtt = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		return $oAtt->GetAsHTML($this->GetOriginal($sAttCode), $this, $bLocalize);
	}

	public function GetOriginalAsXML($sAttCode, $bLocalize = true)
	{
		$oAtt = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		return $oAtt->GetAsXML($this->GetOriginal($sAttCode), $this, $bLocalize);
	}

	public function GetOriginalAsCSV($sAttCode, $sSeparator = ',', $sTextQualifier = '"', $bLocalize = true, $bConvertToPlainText = false)
	{
		$oAtt = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		return $oAtt->GetAsCSV($this->GetOriginal($sAttCode), $sSeparator, $sTextQualifier, $this, $bLocalize, $bConvertToPlainText);
	}

	/**
	 * @param $sObjClass
	 * @param $sObjKey
	 * @param string $sHtmlLabel Label with HTML entities escaped (< escaped as &lt;)
	 * @param null $sUrlMakerClass
	 * @param bool|true $bWithNavigationContext
	 * @return string
	 * @throws DictExceptionMissingString
	 */
	public static function MakeHyperLink($sObjClass, $sObjKey, $sHtmlLabel = '', $sUrlMakerClass = null, $bWithNavigationContext = true)
	{
		if ($sObjKey <= 0) return '<em>'.Dict::S('UI:UndefinedObject').'</em>'; // Objects built in memory have negative IDs

		// Safety net
		//
		if (empty($sHtmlLabel))
		{
			// If the object if not issued from a query but constructed programmatically
			// the label may be empty. In this case run a query to get the object's friendly name
			$oTmpObj = MetaModel::GetObject($sObjClass, $sObjKey, false);
			if (is_object($oTmpObj))
			{
				$sHtmlLabel = $oTmpObj->GetName();
			}
			else
			{
				// May happen in case the target object is not in the list of allowed values for this attribute
				$sHtmlLabel = "<em>$sObjClass::$sObjKey</em>";
			}
		}
		$sHint = MetaModel::GetName($sObjClass)."::$sObjKey";
		$sUrl = ApplicationContext::MakeObjectUrl($sObjClass, $sObjKey, $sUrlMakerClass, $bWithNavigationContext);
		if (strlen($sUrl) > 0)
		{
			return "<a href=\"$sUrl\" title=\"$sHint\">$sHtmlLabel</a>";
		}
		else
		{
			return $sHtmlLabel;
		}
	}

	public function GetHyperlink($sUrlMakerClass = null, $bWithNavigationContext = true)
	{
		return self::MakeHyperLink(get_class($this), $this->GetKey(), $this->GetName(), $sUrlMakerClass, $bWithNavigationContext);
	}
	
	public static function ComputeStandardUIPage($sClass)
	{
		static $aUIPagesCache = array(); // Cache to store the php page used to display each class of object
		if (!isset($aUIPagesCache[$sClass]))
		{
			$UIPage = false;
			if (is_callable("$sClass::GetUIPage"))
			{
				$UIPage = eval("return $sClass::GetUIPage();"); // May return false in case of error
			}
			$aUIPagesCache[$sClass] = $UIPage === false ? './UI.php' : $UIPage;
		}
		$sPage = $aUIPagesCache[$sClass];
		return $sPage;
	}

	public static function GetUIPage()
	{
		return 'UI.php';
	}


	// could be in the metamodel ?
	public static function IsValidPKey($value)
	{
		return ((string)$value === (string)(int)$value);
	}

	public function GetKey()
	{
		return $this->m_iKey;
	}
	public function SetKey($iNewKey)
	{
		if (!self::IsValidPKey($iNewKey))
		{
			throw new CoreException("An object id must be an integer value ($iNewKey)");
		}
		
		if ($this->m_bIsInDB && !empty($this->m_iKey) && ($this->m_iKey != $iNewKey))
		{
			throw new CoreException("Changing the key ({$this->m_iKey} to $iNewKey) on an object (class {".get_class($this).") wich already exists in the Database");
		}
		$this->m_iKey = $iNewKey;
	}
	/**
	 * Get the icon representing this object
	 * @param boolean $bImgTag If true the result is a full IMG tag (or an emtpy string if no icon is defined)
	 * @return string Either the full IMG tag ($bImgTag == true) or just the URL to the icon file
	 */
	public function GetIcon($bImgTag = true)
	{
		$sCode = $this->ComputeHighlightCode();
		if($sCode != '')
		{
			$aHighlightScale = MetaModel::GetHighlightScale(get_class($this));
			if (array_key_exists($sCode, $aHighlightScale))
			{
				$sIconUrl = $aHighlightScale[$sCode]['icon'];
				if($bImgTag)
				{
					return "<img src=\"$sIconUrl\" style=\"vertical-align:middle\"/>";
				}
				else
				{
					return $sIconUrl;
				}
			}
		}		
		return MetaModel::GetClassIcon(get_class($this), $bImgTag);
	}

	/**
	 * Gets the name of an object in a safe manner for displaying inside a web page
	 * @return string
	 */
	public function GetName()
	{
		return htmlentities($this->GetRawName(), ENT_QUOTES, 'UTF-8');
	}

	/**
	 * Gets the raw name of an object, this is not safe for displaying inside a web page
	 * since the " < > characters are not escaped and the name may contain some XSS script
	 * instructions.
	 * Use this function only for internal computations or for an output to a non-HTML destination
	 * @return string
	 */
	public function GetRawName()
	{
		return $this->Get('friendlyname');
	}

	public function GetState()
	{
		$sStateAttCode = MetaModel::GetStateAttributeCode(get_class($this));
		if (empty($sStateAttCode))
		{
			return '';
		}
		else
		{
			return $this->Get($sStateAttCode);
		}
	}

	public function GetStateLabel()
	{
		$sStateAttCode = MetaModel::GetStateAttributeCode(get_class($this));
		if (empty($sStateAttCode))
		{
			return '';
		}
		else
		{
			$sStateValue = $this->Get($sStateAttCode);
			return MetaModel::GetStateLabel(get_class($this), $sStateValue);
		}
	}

	public function GetStateDescription()
	{
		$sStateAttCode = MetaModel::GetStateAttributeCode(get_class($this));
		if (empty($sStateAttCode))
		{
			return '';
		}
		else
		{
			$sStateValue = $this->Get($sStateAttCode);
			return MetaModel::GetStateDescription(get_class($this), $sStateValue);
		}
	}

	/**
	 * Overridable - Define attributes read-only from the end-user perspective
	 * 	 
	 * @return array List of attcodes
	 */	 	  	 	
	public static function GetReadOnlyAttributes()
	{
		return null;
	}


	/**
	 * Overridable - Get predefined objects (could be hardcoded)
	 * The predefined objects will be synchronized with the DB at each install/upgrade
	 * As soon as a class has predefined objects, then nobody can create nor delete objects	 
	 * @return array An array of id => array of attcode => php value(so-called "real value": integer, string, ormDocument, DBObjectSet, etc.)
	 */	 	  	 	
	public static function GetPredefinedObjects()
	{
		return null;
	}

	/**
	 * Returns the set of flags (OPT_ATT_HIDDEN, OPT_ATT_READONLY, OPT_ATT_MANDATORY...)
	 * for the given attribute in the current state of the object
	 * @param $sAttCode string $sAttCode The code of the attribute
	 * @param $aReasons array To store the reasons why the attribute is read-only (info about the synchro replicas)
	 * @param $sTargetState string The target state in which to evalutate the flags, if empty the current state will be used
	 * @return integer Flags: the binary combination of the flags applicable to this attribute
	 */	 	  	 	
	public function GetAttributeFlags($sAttCode, &$aReasons = array(), $sTargetState = '')
	{
		$iFlags = 0; // By default (if no life cycle) no flag at all

		$aReadOnlyAtts = $this->GetReadOnlyAttributes();
		if ($aReadOnlyAtts != null)
		{
			if (in_array($sAttCode, $aReadOnlyAtts))
			{
				return OPT_ATT_READONLY;
			}
		}

		$sStateAttCode = MetaModel::GetStateAttributeCode(get_class($this));
		if (!empty($sStateAttCode))
		{
			if ($sTargetState != '')
			{
				$iFlags = MetaModel::GetAttributeFlags(get_class($this), $sTargetState, $sAttCode);			
			}
			else
			{
				$iFlags = MetaModel::GetAttributeFlags(get_class($this), $this->Get($sStateAttCode), $sAttCode);
			}
		}
		$aReasons = array();
		$iSynchroFlags = 0;
		if ($this->InSyncScope())
		{
			$iSynchroFlags = $this->GetSynchroReplicaFlags($sAttCode, $aReasons);
		}
		return $iFlags | $iSynchroFlags; // Combine both sets of flags
	}

    /**
     * Returns the set of flags (OPT_ATT_HIDDEN, OPT_ATT_READONLY, OPT_ATT_MANDATORY...)
     * for the given attribute in a transition
     * @param $sAttCode string $sAttCode The code of the attribute
     * @param $sStimulus string The stimulus code to apply
     * @param $aReasons array To store the reasons why the attribute is read-only (info about the synchro replicas)
     * @param $sOriginState string The state from which to apply $sStimulus, if empty current state will be used
     * @return integer Flags: the binary combination of the flags applicable to this attribute
     */
    public function GetTransitionFlags($sAttCode, $sStimulus, &$aReasons = array(), $sOriginState = '')
    {
        $iFlags = 0; // By default (if no lifecycle) no flag at all

        $sStateAttCode = MetaModel::GetStateAttributeCode(get_class($this));
        // If no state attribute, there is no lifecycle
        if (empty($sStateAttCode))
        {
            return $iFlags;
        }

        // Retrieving current state if necessary
        if ($sOriginState === '')
        {
            $sOriginState = $this->Get($sStateAttCode);
        }

        // Retrieving attribute flags
        $iAttributeFlags = $this->GetAttributeFlags($sAttCode, $aReasons, $sOriginState);

        // Retrieving transition flags
        $iTransitionFlags = MetaModel::GetTransitionFlags(get_class($this), $sOriginState, $sStimulus, $sAttCode);

        // Merging transition flags with attribute flags
        $iFlags = $iTransitionFlags | $iAttributeFlags;

        return $iFlags;
    }

    /**
     * Returns an array of attribute codes (with their flags) when $sStimulus is applied on the object in the $sOriginState state.
     * Note: Attributes (and flags) from the target state and the transition are combined.
     *
     * @param $sStimulus string
     * @param $sOriginState string Default is current state
     * @return array
     */
    public function GetTransitionAttributes($sStimulus, $sOriginState = null)
    {
        $sObjClass = get_class($this);

        // Defining current state as origin state if not specified
        if($sOriginState === null)
        {
            $sOriginState = $this->GetState();
        }

        $aAttributes = MetaModel::GetTransitionAttributes($sObjClass, $sStimulus, $sOriginState);

        return $aAttributes;
    }

	/**
	 * Returns the set of flags (OPT_ATT_HIDDEN, OPT_ATT_READONLY, OPT_ATT_MANDATORY...)
	 * for the given attribute for the current state of the object considered as an INITIAL state
	 * @param string $sAttCode The code of the attribute
	 * @return integer Flags: the binary combination of the flags applicable to this attribute
	 */	 	  	 	
	public function GetInitialStateAttributeFlags($sAttCode, &$aReasons = array())
	{
		$iFlags = 0;
		$sStateAttCode = MetaModel::GetStateAttributeCode(get_class($this));
		if (!empty($sStateAttCode))
		{
			$iFlags = MetaModel::GetInitialStateAttributeFlags(get_class($this), $this->Get($sStateAttCode), $sAttCode);
		}
		return $iFlags; // No need to care about the synchro flags since we'll be creating a new object anyway
	}

	// check if the given (or current) value is suitable for the attribute
	// return true if successfull
	// return the error desciption otherwise
	public function CheckValue($sAttCode, $value = null)
	{
		if (!is_null($value))
		{
			$toCheck = $value;
		}
		else
		{
			$toCheck = $this->Get($sAttCode);
		}

		$oAtt = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		if (!$oAtt->IsWritable())
		{
			return true;
		}
		elseif ($oAtt->IsNull($toCheck))
		{
			if ($oAtt->IsNullAllowed())
			{
				return true;
			}
			else
			{
				return "Null not allowed";
			}
		}
		elseif ($oAtt->IsExternalKey())
		{
			if (!MetaModel::SkipCheckExtKeys())
			{
				$sTargetClass = $oAtt->GetTargetClass();
				$oTargetObj = MetaModel::GetObject($sTargetClass, $toCheck, false /*must be found*/, true /*allow all data*/);
				if (is_null($oTargetObj))
				{
					return "Target object not found ($sTargetClass::$toCheck)";
				}
			}
			if ($oAtt->IsHierarchicalKey())
			{
				// This check cannot be deactivated since otherwise the user may break things by a CSV import of a bulk modify
				if ($toCheck == $this->GetKey())
				{
					return "An object can not be its own parent in a hierarchy (".$oAtt->Getlabel()." = $toCheck)";
				}
			}
		}
		elseif ($oAtt->IsScalar())
		{
			$aValues = $oAtt->GetAllowedValues($this->ToArgsForQuery());
			if (count($aValues) > 0)
			{
				if (!array_key_exists($toCheck, $aValues))
				{
					return "Value not allowed [$toCheck]";
				}
			}
			if (!is_null($iMaxSize = $oAtt->GetMaxSize()))
			{
				$iLen = strlen($toCheck);
				if ($iLen > $iMaxSize)
				{
					return "String too long (found $iLen, limited to $iMaxSize)";
				}
			}
			if (!$oAtt->CheckFormat($toCheck))
			{
				return "Wrong format [$toCheck]";
			}
		}
		else
		{
			return $oAtt->CheckValue($this, $toCheck);
		}
		return true;
	}
	
	// check attributes together
	public function CheckConsistency()
	{
		return true;
	}
	
	// check integrity rules (before inserting or updating the object)
	// a displayable error is returned
	public function DoCheckToWrite()
	{
		$this->DoComputeValues();

		$aChanges = $this->ListChanges();

		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode=>$oAttDef)
		{
			$res = $this->CheckValue($sAttCode);
			if ($res !== true)
			{
				// $res contains the error description
				$this->m_aCheckIssues[] = "Unexpected value for attribute '$sAttCode': $res";
			}
		}
		if (count($this->m_aCheckIssues) > 0)
		{
			// No need to check consistency between attributes if any of them has
			// an unexpected value
			return;
		}
		$res = $this->CheckConsistency();
		if ($res !== true)
		{
			// $res contains the error description
			$this->m_aCheckIssues[] = "Consistency rules not followed: $res";
		}

		// Synchronization: are we attempting to modify an attribute for which an external source is master?
		//
		if ($this->m_bIsInDB && $this->InSyncScope() && (count($aChanges) > 0))
		{
			foreach($aChanges as $sAttCode => $value)
			{
				$iFlags = $this->GetSynchroReplicaFlags($sAttCode, $aReasons);
				if ($iFlags & OPT_ATT_SLAVE)
				{
					// Note: $aReasonInfo['name'] could be reported (the task owning the attribute)
					$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
					$sAttLabel = $oAttDef->GetLabel();
					foreach($aReasons as $aReasonInfo)
					{
						// Todo: associate the attribute code with the error
						$this->m_aCheckIssues[] = Dict::Format('UI:AttemptingToSetASlaveAttribute_Name', $sAttLabel);
					}
				}
			}
		}
	}

	final public function CheckToWrite()
	{
		if (MetaModel::SkipCheckToWrite())
		{
			return array(true, array());
		}
		if (is_null($this->m_bCheckStatus))
		{
			$this->m_aCheckIssues = array();

			$oKPI = new ExecutionKPI();
			$this->DoCheckToWrite();
			$oKPI->ComputeStats('CheckToWrite', get_class($this));
			if (count($this->m_aCheckIssues) == 0)
			{
				$this->m_bCheckStatus = true;
			}
			else
			{
				$this->m_bCheckStatus = false;
			}
		}
		return array($this->m_bCheckStatus, $this->m_aCheckIssues, $this->m_bSecurityIssue);
	}

	// check if it is allowed to delete the existing object from the database
	// a displayable error is returned
	protected function DoCheckToDelete(&$oDeletionPlan)
	{
		$this->m_aDeleteIssues = array(); // Ok

		if ($this->InSyncScope())
		{

			foreach ($this->GetSynchroData() as $iSourceId => $aSourceData)
			{
				foreach ($aSourceData['replica'] as $oReplica)
				{
					$oDeletionPlan->AddToDelete($oReplica, DEL_SILENT);
				}
				$oDataSource = $aSourceData['source'];
				if ($oDataSource->GetKey() == SynchroExecution::GetCurrentTaskId())
				{
					// The current task has the right to delete the object
					continue;
				}
				$oReplica = reset($aSourceData['replica']); // Take the first one
				if ($oReplica->Get('status_dest_creator') != 1)
				{
					// The object is not owned by the task
					continue;
				}

				$sLink = $oDataSource->GetName();
				$sUserDeletePolicy = $oDataSource->Get('user_delete_policy');
				switch($sUserDeletePolicy)
				{
				case 'nobody':
					$this->m_aDeleteIssues[] = Dict::Format('Core:Synchro:TheObjectCannotBeDeletedByUser_Source', $sLink);
					break;

				case 'administrators':
					if (!UserRights::IsAdministrator())
					{
						$this->m_aDeleteIssues[] = Dict::Format('Core:Synchro:TheObjectCannotBeDeletedByUser_Source', $sLink);
					}
					break;

				case 'everybody':
				default:
					// Ok
					break;
				}
			}
		}
	}

  	public function CheckToDelete(&$oDeletionPlan)
  	{
		$this->MakeDeletionPlan($oDeletionPlan);
		$oDeletionPlan->ComputeResults();
		return (!$oDeletionPlan->FoundStopper());
	} 

	protected function ListChangedValues(array $aProposal)
	{
		$aDelta = array();
		foreach ($aProposal as $sAtt => $proposedValue)
		{
			if (!array_key_exists($sAtt, $this->m_aOrigValues))
			{
				// The value was not set
				$aDelta[$sAtt] = $proposedValue;
			}
			elseif(!array_key_exists($sAtt, $this->m_aTouchedAtt) || (array_key_exists($sAtt, $this->m_aModifiedAtt) && $this->m_aModifiedAtt[$sAtt] == false))
			{
				// This attCode was never set, cannot be modified
				// or the same value - as the original value - was set, and has been verified as equivalent to the original value
				continue;
			}
			else if (array_key_exists($sAtt, $this->m_aModifiedAtt) && $this->m_aModifiedAtt[$sAtt] == true)
			{
				// We already know that the value is really modified
				$aDelta[$sAtt] = $proposedValue;
			}
			elseif(is_object($proposedValue))
			{
				$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAtt);
				// The value is an object, the comparison is not strict
				if (!$oAttDef->Equals($this->m_aOrigValues[$sAtt], $proposedValue))
				{
					$aDelta[$sAtt] = $proposedValue;
					$this->m_aModifiedAtt[$sAtt] = true; // Really modified
				}
				else
				{
					$this->m_aModifiedAtt[$sAtt] = false; // Not really modified
				}
			}
			else
			{
				// The value is a scalar, the comparison must be 100% strict
				if($this->m_aOrigValues[$sAtt] !== $proposedValue)
				{	
					//echo "$sAtt:<pre>\n";
					//var_dump($this->m_aOrigValues[$sAtt]);
					//var_dump($proposedValue);
					//echo "</pre>\n";
					$aDelta[$sAtt] = $proposedValue;
					$this->m_aModifiedAtt[$sAtt] = true; // Really modified
				}
				else
				{
					$this->m_aModifiedAtt[$sAtt] = false; // Not really modified
				}
			}
		}
		return $aDelta;
	} 

	// List the attributes that have been changed
	// Returns an array of attname => currentvalue
	public function ListChanges()
	{
		if ($this->m_bIsInDB)
		{
			return $this->ListChangedValues($this->m_aCurrValues);
		}
		else
		{
			return $this->m_aCurrValues;
		}
	}

	// Tells whether or not an object was modified since last read (ie: does it differ from the DB ?)
	public function IsModified()
	{
		$aChanges = $this->ListChanges();
		return (count($aChanges) != 0);
	}

	public function Equals($oSibling)
	{
		if (get_class($oSibling) != get_class($this))
		{
			return false;
		}
		if ($this->GetKey() != $oSibling->GetKey())
		{
			return false;
		}
		if ($this->m_bIsInDB)
		{
			// If one has changed, then consider them as being different
			if ($this->IsModified() || $oSibling->IsModified())
			{
				return false;
			}
		}
		else
		{
			// Todo - implement this case (loop on every attribute)
			//foreach(MetaModel::ListAttributeDefs(get_class($this) as $sAttCode => $oAttDef)
			//{
					//if (!isset($this->m_CurrentValues[$sAttCode])) continue;
					//if (!isset($this->m_CurrentValues[$sAttCode])) continue;
					//if (!$oAttDef->Equals($this->m_CurrentValues[$sAttCode], $oSibling->m_CurrentValues[$sAttCode]))
					//{
						//return false;
					//}
			//}
			return false;
		}
		return true;
	}

	// used only by insert
	protected function OnObjectKeyReady()
    {
        // Meant to be overloaded
    }

	// used both by insert/update
	private function DBWriteLinks()
	{
		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode=>$oAttDef)
		{
			if (!$oAttDef->IsLinkSet()) continue;
			if (!array_key_exists($sAttCode, $this->m_aTouchedAtt)) continue;
			if (array_key_exists($sAttCode, $this->m_aModifiedAtt) && ($this->m_aModifiedAtt[$sAttCode] == false)) continue;
				
			// Note: any change to this algorithm must be reproduced into the implementation of AttributeLinkSet::Equals()
			$sExtKeyToMe = $oAttDef->GetExtKeyToMe();
			$sAdditionalKey = null;
			if ($oAttDef->IsIndirect() && !$oAttDef->DuplicatesAllowed())
			{
				$sAdditionalKey = $oAttDef->GetExtKeyToRemote();
			}
			$oComparator = new DBObjectSetComparator($this->m_aOrigValues[$sAttCode], $this->Get($sAttCode), array($sExtKeyToMe), $sAdditionalKey);
			$aChanges = $oComparator->GetDifferences();
			
			foreach($aChanges['added'] as $oLink)
			{
				// Make sure that the objects in the set point to "this"
				$oLink->Set($oAttDef->GetExtKeyToMe(), $this->m_iKey);
				$id = $oLink->DBWrite();
			}
			
			foreach($aChanges['modified'] as $oLink)
			{
				// Objects in the set either remain attached or have been detached -> leave the link as is
				$oLink->DBWrite();
			}
			
			foreach($aChanges['removed'] as $oLink)
			{
				$oLink->DBDelete();
			}
		}
	}

	// used both by insert/update
	private function WriteExternalAttributes()
	{
		foreach (MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode => $oAttDef)
		{
			if (!$oAttDef->LoadInObject()) continue;
			if ($oAttDef->LoadFromDB()) continue;
			if (!array_key_exists($sAttCode, $this->m_aTouchedAtt)) continue;
			if (array_key_exists($sAttCode, $this->m_aModifiedAtt) && ($this->m_aModifiedAtt[$sAttCode] == false)) continue;
			$oAttDef->WriteValue($this, $this->m_aCurrValues[$sAttCode]);
		}
	}

	// Note: this is experimental - it was designed to speed up the setup of iTop
	// Known limitations:
	//   - does not work with multi-table classes (issue with the unique id to maintain in several tables)
	//   - the id of the object is not updated
	static public final function BulkInsertStart()
	{
		self::$m_bBulkInsert = true;
	} 

	static public final function BulkInsertFlush()
	{
		if (!self::$m_bBulkInsert) return;

		foreach(self::$m_aBulkInsertCols as $sClass => $aTables)
		{
			foreach ($aTables as $sTable => $sColumns)
			{
				$sValues = implode(', ', self::$m_aBulkInsertItems[$sClass][$sTable]);
				$sInsertSQL = "INSERT INTO `$sTable` ($sColumns) VALUES $sValues";
				$iNewKey = CMDBSource::InsertInto($sInsertSQL);
			}
		}

		// Reset
		self::$m_aBulkInsertItems = array();
		self::$m_aBulkInsertCols = array();
		self::$m_bBulkInsert = false;
	} 

	private function DBInsertSingleTable($sTableClass)
	{
		$sTable = MetaModel::DBGetTable($sTableClass);
		// Abstract classes or classes having no specific attribute do not have an associated table
		if ($sTable == '') return;

		$sClass = get_class($this);

		// fields in first array, values in the second
		$aFieldsToWrite = array();
		$aValuesToWrite = array();
		
		if (!empty($this->m_iKey) && ($this->m_iKey >= 0))
		{
			// Add it to the list of fields to write
			$aFieldsToWrite[] = '`'.MetaModel::DBGetKey($sTableClass).'`';
			$aValuesToWrite[] = CMDBSource::Quote($this->m_iKey);
		}

		$aHierarchicalKeys = array();
		
		foreach(MetaModel::ListAttributeDefs($sTableClass) as $sAttCode=>$oAttDef)
		{
			// Skip this attribute if not defined in this table
			if (!MetaModel::IsAttributeOrigin($sTableClass, $sAttCode)) continue;
			$aAttColumns = $oAttDef->GetSQLValues($this->m_aCurrValues[$sAttCode]);
			foreach($aAttColumns as $sColumn => $sValue)
			{
				$aFieldsToWrite[] = "`$sColumn`"; 
				$aValuesToWrite[] = CMDBSource::Quote($sValue);
			}
			if ($oAttDef->IsHierarchicalKey())
			{
				$aHierarchicalKeys[$sAttCode] = $oAttDef;
			}
		}

		if (count($aValuesToWrite) == 0) return false;

		if (MetaModel::DBIsReadOnly())
		{
			$iNewKey = -1;
		}
		else
		{
			if (self::$m_bBulkInsert)
			{
				if (!isset(self::$m_aBulkInsertCols[$sClass][$sTable]))
				{
					self::$m_aBulkInsertCols[$sClass][$sTable] = implode(', ', $aFieldsToWrite);
				}
				self::$m_aBulkInsertItems[$sClass][$sTable][] = '('.implode (', ', $aValuesToWrite).')';
				
				$iNewKey = 999999; // TODO - compute next id....
			}
			else
			{
				if (count($aHierarchicalKeys) > 0)
				{
					foreach($aHierarchicalKeys as $sAttCode => $oAttDef)
					{
						$aValues = MetaModel::HKInsertChildUnder($this->m_aCurrValues[$sAttCode], $oAttDef, $sTable);
						$aFieldsToWrite[] = '`'.$oAttDef->GetSQLRight().'`';
						$aValuesToWrite[] = $aValues[$oAttDef->GetSQLRight()];
						$aFieldsToWrite[] = '`'.$oAttDef->GetSQLLeft().'`';
						$aValuesToWrite[] = $aValues[$oAttDef->GetSQLLeft()];
					}
				}
				$sInsertSQL = "INSERT INTO `$sTable` (".join(",", $aFieldsToWrite).") VALUES (".join(", ", $aValuesToWrite).")";
				$iNewKey = CMDBSource::InsertInto($sInsertSQL);
			}
		}
		// Note that it is possible to have a key defined here, and the autoincrement expected, this is acceptable in a non root class
		if (empty($this->m_iKey))
		{
			// Take the autonumber
			$this->m_iKey = $iNewKey;
		}
		return $this->m_iKey;
	}

	// Insert of record for the new object into the database
	// Returns the key of the newly created object
	public function DBInsertNoReload()
	{
		if ($this->m_bIsInDB)
		{
			throw new CoreException("The object already exists into the Database, you may want to use the clone function");
		}

		$sClass = get_class($this);
		$sRootClass = MetaModel::GetRootClass($sClass);

		// Ensure the update of the values (we are accessing the data directly)
		$this->DoComputeValues();
		$this->OnInsert();

		if ($this->m_iKey < 0)
		{
			// This was a temporary "memory" key: discard it so that DBInsertSingleTable will not try to use it!
			$this->m_iKey = null; 
		}

		// If not automatically computed, then check that the key is given by the caller
		if (!MetaModel::IsAutoIncrementKey($sRootClass))
		{
			if (empty($this->m_iKey))
			{
				throw new CoreWarning("Missing key for the object to write - This class is supposed to have a user defined key, not an autonumber", array('class' => $sRootClass));
			}
		}

		// Ultimate check - ensure DB integrity
		list($bRes, $aIssues) = $this->CheckToWrite();
		if (!$bRes)
		{
			$sIssues = implode(', ', $aIssues);
			throw new CoreException("Object not following integrity rules", array('issues' => $sIssues, 'class' => get_class($this), 'id' => $this->GetKey()));
		}

		// Stop watches
		$sState = $this->GetState();
		if ($sState != '')
		{
			foreach(MetaModel::ListAttributeDefs($sClass) as $sAttCode => $oAttDef)
			{
				if ($oAttDef instanceof AttributeStopWatch)
				{
					if (in_array($sState, $oAttDef->GetStates()))
					{
						// Start the stop watch and compute the deadlines
						$oSW = $this->Get($sAttCode);
						$oSW->Start($this, $oAttDef);
						$oSW->ComputeDeadlines($this, $oAttDef);
						$this->Set($sAttCode, $oSW);
					}
				}
			}
		}

		// First query built upon on the root class, because the ID must be created first
		$this->m_iKey = $this->DBInsertSingleTable($sRootClass);

		// Then do the leaf class, if different from the root class
		if ($sClass != $sRootClass)
		{
			$this->DBInsertSingleTable($sClass);
		}

		// Then do the other classes
		foreach(MetaModel::EnumParentClasses($sClass) as $sParentClass)
		{
			if ($sParentClass == $sRootClass) continue;
			$this->DBInsertSingleTable($sParentClass);
		}

		$this->OnObjectKeyReady();

        $this->DBWriteLinks();
		$this->WriteExternalAttributes();

		$this->m_bIsInDB = true;
		$this->m_bDirty = false;

		$this->AfterInsert();

		// Activate any existing trigger 
		$sClass = get_class($this);
		$sClassList = implode("', '", MetaModel::EnumParentClasses($sClass, ENUM_PARENT_CLASSES_ALL));
		$oSet = new DBObjectSet(DBObjectSearch::FromOQL("SELECT TriggerOnObjectCreate AS t WHERE t.target_class IN ('$sClassList')"));
		while ($oTrigger = $oSet->Fetch())
		{
			$oTrigger->DoActivate($this->ToArgs('this'));
		}

		// Callbacks registered with RegisterCallback
		if (isset($this->m_aCallbacks[self::CALLBACK_AFTERINSERT]))
		{
			foreach ($this->m_aCallbacks[self::CALLBACK_AFTERINSERT] as $aCallBackData)
			{
				call_user_func_array($aCallBackData['callback'], $aCallBackData['params']);
			}
		}

		$this->RecordObjCreation();

		return $this->m_iKey;
	}

	protected function MakeInsertStatementSingleTable($aAuthorizedExtKeys, &$aStatements, $sTableClass)
	{
		$sTable = MetaModel::DBGetTable($sTableClass);
		// Abstract classes or classes having no specific attribute do not have an associated table
		if ($sTable == '') return;

		$sClass = get_class($this);

		// fields in first array, values in the second
		$aFieldsToWrite = array();
		$aValuesToWrite = array();
		
		if (!empty($this->m_iKey) && ($this->m_iKey >= 0))
		{
			// Add it to the list of fields to write
			$aFieldsToWrite[] = '`'.MetaModel::DBGetKey($sTableClass).'`';
			$aValuesToWrite[] = CMDBSource::Quote($this->m_iKey);
		}

		$aHierarchicalKeys = array();
		foreach(MetaModel::ListAttributeDefs($sTableClass) as $sAttCode=>$oAttDef)
		{
			// Skip this attribute if not defined in this table
			if (!MetaModel::IsAttributeOrigin($sTableClass, $sAttCode)) continue;
			// Skip link set that can still be undefined though the object is 100% loaded
			if ($oAttDef->IsLinkSet()) continue;

			$value = $this->m_aCurrValues[$sAttCode];
			if ($oAttDef->IsExternalKey())
			{
				$sTargetClass = $oAttDef->GetTargetClass();
				if (is_array($aAuthorizedExtKeys))
				{
					if (!array_key_exists($sTargetClass, $aAuthorizedExtKeys) || !array_key_exists($value, $aAuthorizedExtKeys[$sTargetClass]))
					{
						$value = 0;
					}
				}
			}
			$aAttColumns = $oAttDef->GetSQLValues($value);
			foreach($aAttColumns as $sColumn => $sValue)
			{
				$aFieldsToWrite[] = "`$sColumn`"; 
				$aValuesToWrite[] = CMDBSource::Quote($sValue);
			}
			if ($oAttDef->IsHierarchicalKey())
			{
				$aHierarchicalKeys[$sAttCode] = $oAttDef;
			}
		}

		if (count($aValuesToWrite) == 0) return false;

		if (count($aHierarchicalKeys) > 0)
		{
			foreach($aHierarchicalKeys as $sAttCode => $oAttDef)
			{
				$aValues = MetaModel::HKInsertChildUnder($this->m_aCurrValues[$sAttCode], $oAttDef, $sTable);
				$aFieldsToWrite[] = '`'.$oAttDef->GetSQLRight().'`';
				$aValuesToWrite[] = $aValues[$oAttDef->GetSQLRight()];
				$aFieldsToWrite[] = '`'.$oAttDef->GetSQLLeft().'`';
				$aValuesToWrite[] = $aValues[$oAttDef->GetSQLLeft()];
			}
		}
		$aStatements[] = "INSERT INTO `$sTable` (".join(",", $aFieldsToWrite).") VALUES (".join(", ", $aValuesToWrite).");";
	}

	public function MakeInsertStatements($aAuthorizedExtKeys, &$aStatements)
	{
		$sClass = get_class($this);
		$sRootClass = MetaModel::GetRootClass($sClass);

		// First query built upon on the root class, because the ID must be created first
		$this->MakeInsertStatementSingleTable($aAuthorizedExtKeys, $aStatements, $sRootClass);

		// Then do the leaf class, if different from the root class
		if ($sClass != $sRootClass)
		{
			$this->MakeInsertStatementSingleTable($aAuthorizedExtKeys, $aStatements, $sClass);
		}

		// Then do the other classes
		foreach(MetaModel::EnumParentClasses($sClass) as $sParentClass)
		{
			if ($sParentClass == $sRootClass) continue;
			$this->MakeInsertStatementSingleTable($aAuthorizedExtKeys, $aStatements, $sParentClass);
		}
	}

	public function DBInsert()
	{
		$this->DBInsertNoReload();
		$this->Reload();
		return $this->m_iKey;
	}
	
	public function DBInsertTracked(CMDBChange $oChange)
	{
		CMDBObject::SetCurrentChange($oChange);
		return $this->DBInsert();
	}

	public function DBInsertTrackedNoReload(CMDBChange $oChange)
	{
		CMDBObject::SetCurrentChange($oChange);
		return $this->DBInsertNoReload();
	}

	// Creates a copy of the current object into the database
	// Returns the id of the newly created object
	public function DBClone($iNewKey = null)
	{
		$this->m_bIsInDB = false;
		$this->m_iKey = $iNewKey;
		$ret = $this->DBInsert();
		$this->RecordObjCreation();
		return $ret;
	}
	
	/**
	 * This function is automatically called after cloning an object with the "clone" PHP language construct
	 * The purpose of this method is to reset the appropriate attributes of the object in
	 * order to make sure that the newly cloned object is really distinct from its clone
	 */
	public function __clone()
	{
		$this->m_bIsInDB = false;
		$this->m_bDirty = true;
		$this->m_iKey = self::GetNextTempId(get_class($this));
	}

	// Update a record
	public function DBUpdate()
	{
		if (!$this->m_bIsInDB)
		{
			throw new CoreException("DBUpdate: could not update a newly created object, please call DBInsert instead");
		}

		// Protect against reentrance (e.g. cascading the update of ticket logs)
		static $aUpdateReentrance = array();
		$sKey = get_class($this).'::'.$this->GetKey();
		if (array_key_exists($sKey, $aUpdateReentrance))
		{
			return;
		}
		$aUpdateReentrance[$sKey] = true;

		try
		{
			// Stop watches
			$sState = $this->GetState();
			if ($sState != '')
			{
				foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode => $oAttDef)
				{
					if ($oAttDef instanceof AttributeStopWatch)
					{
						if (in_array($sState, $oAttDef->GetStates()))
						{
							// Compute or recompute the deadlines
							$oSW = $this->Get($sAttCode);
							$oSW->ComputeDeadlines($this, $oAttDef);
							$this->Set($sAttCode, $oSW);
						}
					}
				}
			}

			$this->DoComputeValues();
			$this->OnUpdate();

			$aChanges = $this->ListChanges();
			if (count($aChanges) == 0)
			{
				// Attempting to update an unchanged object
				unset($aUpdateReentrance[$sKey]);
				return $this->m_iKey;
			}

			// Ultimate check - ensure DB integrity
			list($bRes, $aIssues) = $this->CheckToWrite();
			if (!$bRes)
			{
				$sIssues = implode(', ', $aIssues);
				throw new CoreException("Object not following integrity rules", array('issues' => $sIssues, 'class' => get_class($this), 'id' => $this->GetKey()));
			}

			// Save the original values (will be reset to the new values when the object get written to the DB)
			$aOriginalValues = $this->m_aOrigValues;

			$bHasANewExternalKeyValue = false;
			$aHierarchicalKeys = array();
			$aDBChanges = array();
			foreach($aChanges as $sAttCode => $valuecurr)
			{
				$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
				if ($oAttDef->IsExternalKey()) $bHasANewExternalKeyValue = true;
				if ($oAttDef->IsDirectField())
				{
					$aDBChanges[$sAttCode] = $aChanges[$sAttCode];
				}
				if ($oAttDef->IsHierarchicalKey())
				{
					$aHierarchicalKeys[$sAttCode] = $oAttDef;
				}
			}

			if (!MetaModel::DBIsReadOnly())
			{
				// Update the left & right indexes for each hierarchical key
				foreach($aHierarchicalKeys as $sAttCode => $oAttDef)
				{
					$sTable = $sTable = MetaModel::DBGetTable(get_class($this), $sAttCode);
					$sSQL = "SELECT `".$oAttDef->GetSQLRight()."` AS `right`, `".$oAttDef->GetSQLLeft()."` AS `left` FROM `$sTable` WHERE id=".$this->GetKey();
					$aRes = CMDBSource::QueryToArray($sSQL);
					$iMyLeft = $aRes[0]['left'];
					$iMyRight = $aRes[0]['right'];
					$iDelta =$iMyRight - $iMyLeft + 1;
					MetaModel::HKTemporaryCutBranch($iMyLeft, $iMyRight, $oAttDef, $sTable);
					
					if ($aDBChanges[$sAttCode] == 0)
					{
						// No new parent, insert completely at the right of the tree
						$sSQL = "SELECT max(`".$oAttDef->GetSQLRight()."`) AS max FROM `$sTable`";
						$aRes = CMDBSource::QueryToArray($sSQL);
						if (count($aRes) == 0)
						{
							$iNewLeft = 1;
						}
						else
						{
							$iNewLeft = $aRes[0]['max']+1;
						}
					}
					else
					{
						// Insert at the right of the specified parent
						$sSQL = "SELECT `".$oAttDef->GetSQLRight()."` FROM `$sTable` WHERE id=".((int)$aDBChanges[$sAttCode]);
						$iNewLeft = CMDBSource::QueryToScalar($sSQL);
					}

					MetaModel::HKReplugBranch($iNewLeft, $iNewLeft + $iDelta - 1, $oAttDef, $sTable);

					$aHKChanges = array();
					$aHKChanges[$sAttCode] = $aDBChanges[$sAttCode];
					$aHKChanges[$oAttDef->GetSQLLeft()] = $iNewLeft;
					$aHKChanges[$oAttDef->GetSQLRight()] = $iNewLeft + $iDelta - 1;
					$aDBChanges[$sAttCode] = $aHKChanges; // the 3 values will be stored by MakeUpdateQuery below
				}
				
				// Update scalar attributes
				if (count($aDBChanges) != 0)
				{
					$oFilter = new DBObjectSearch(get_class($this));
					$oFilter->AddCondition('id', $this->m_iKey, '=');
					$oFilter->AllowAllData();
			
					$sSQL = $oFilter->MakeUpdateQuery($aDBChanges);
					CMDBSource::Query($sSQL);
				}
			}

			$this->DBWriteLinks();
			$this->WriteExternalAttributes();

			$this->m_bDirty = false;
			$this->m_aTouchedAtt = array();
			$this->m_aModifiedAtt = array();

			$this->AfterUpdate();

			// Reload to get the external attributes
			if ($bHasANewExternalKeyValue)
			{
				$this->Reload(true /* AllowAllData */);
			}
			else
			{
				// Reset original values although the object has not been reloaded
				foreach ($this->m_aLoadedAtt as $sAttCode => $bLoaded)
				{
					if ($bLoaded)
					{
						$value = $this->m_aCurrValues[$sAttCode];
						$this->m_aOrigValues[$sAttCode] = is_object($value) ? clone $value : $value;
					}
				}
			}

			if (count($aChanges) != 0)
			{
				$this->RecordAttChanges($aChanges, $aOriginalValues);
			}
		}
		catch (Exception $e)
		{
			unset($aUpdateReentrance[$sKey]);
			throw $e;
		}

		unset($aUpdateReentrance[$sKey]);
		return $this->m_iKey;
	}
	
	public function DBUpdateTracked(CMDBChange $oChange)
	{
		CMDBObject::SetCurrentChange($oChange);
		return $this->DBUpdate();
	}

	// Make the current changes persistent - clever wrapper for Insert or Update
	public function DBWrite()
	{
		if ($this->m_bIsInDB)
		{
			return $this->DBUpdate();
		}
		else
		{
			return $this->DBInsert();
		}
	}

	private function DBDeleteSingleTable($sTableClass)
	{
		$sTable = MetaModel::DBGetTable($sTableClass);
		// Abstract classes or classes having no specific attribute do not have an associated table
		if ($sTable == '') return;

		$sPKField = '`'.MetaModel::DBGetKey($sTableClass).'`';
		$sKey = CMDBSource::Quote($this->m_iKey);

		$sDeleteSQL = "DELETE FROM `$sTable` WHERE $sPKField = $sKey";
		CMDBSource::DeleteFrom($sDeleteSQL);
	}

	protected function DBDeleteSingleObject()
	{
		if (!MetaModel::DBIsReadOnly())
		{
			$this->OnDelete();
			$this->RecordObjDeletion($this->m_iKey); // May cause a reload for storing history information
			
			foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode => $oAttDef)
			{
				if ($oAttDef->IsHierarchicalKey())
				{
					// Update the left & right indexes for each hierarchical key
					$sTable = $sTable = MetaModel::DBGetTable(get_class($this), $sAttCode);
					$sSQL = "SELECT `".$oAttDef->GetSQLRight()."` AS `right`, `".$oAttDef->GetSQLLeft()."` AS `left` FROM `$sTable` WHERE id=".CMDBSource::Quote($this->m_iKey);
					$aRes = CMDBSource::QueryToArray($sSQL);
					$iMyLeft = $aRes[0]['left'];
					$iMyRight = $aRes[0]['right'];
					$iDelta =$iMyRight - $iMyLeft + 1;
					MetaModel::HKTemporaryCutBranch($iMyLeft, $iMyRight, $oAttDef, $sTable);

					// No new parent for now, insert completely at the right of the tree
					$sSQL = "SELECT max(`".$oAttDef->GetSQLRight()."`) AS max FROM `$sTable`";
					$aRes = CMDBSource::QueryToArray($sSQL);
					if (count($aRes) == 0)
					{
						$iNewLeft = 1;
					}
					else
					{
						$iNewLeft = $aRes[0]['max']+1;
					}
					MetaModel::HKReplugBranch($iNewLeft, $iNewLeft + $iDelta - 1, $oAttDef, $sTable);
				}
				elseif (!$oAttDef->LoadFromDB())
				{
					$oAttDef->DeleteValue($this);
				}
			}

			foreach(MetaModel::EnumParentClasses(get_class($this), ENUM_PARENT_CLASSES_ALL) as $sParentClass)
			{
				$this->DBDeleteSingleTable($sParentClass);
			}
			
			$this->AfterDelete();

			$this->m_bIsInDB = false;
			// Fix for #926: do NOT reset m_iKey as it can be used to have it for reporting purposes (see the REST service to delete objects, reported as bug #926)
			// Thought the key is not reset, using DBInsert or DBWrite will create an object having the same characteristics and a new ID. DBUpdate is protected
		}
	}

	// Delete an object... and guarantee data integrity
	//
	public function DBDelete(&$oDeletionPlan = null)
	{
		static $iLoopTimeLimit = null;
		if ($iLoopTimeLimit == null)
		{
			$iLoopTimeLimit = MetaModel::GetConfig()->Get('max_execution_time_per_loop');
		}
		if (is_null($oDeletionPlan))
		{
			$oDeletionPlan = new DeletionPlan();
		}
		$this->MakeDeletionPlan($oDeletionPlan);
		$oDeletionPlan->ComputeResults();

		if ($oDeletionPlan->FoundStopper())
		{
			$aIssues = $oDeletionPlan->GetIssues();
			throw new DeleteException('Found issue(s)', array('target_class' => get_class($this), 'target_id' => $this->GetKey(), 'issues' => implode(', ', $aIssues)));	
		}
		else
		{
			// Getting and setting time limit are not symetric:
			// www.php.net/manual/fr/function.set-time-limit.php#72305
			$iPreviousTimeLimit = ini_get('max_execution_time');

			foreach ($oDeletionPlan->ListDeletes() as $sClass => $aToDelete)
			{
				foreach ($aToDelete as $iId => $aData)
				{
					$oToDelete = $aData['to_delete'];
					// The deletion based on a deletion plan should not be done for each oject if the deletion plan is common (Trac #457)
					// because for each object we would try to update all the preceding ones... that are already deleted
					// A better approach would be to change the API to apply the DBDelete on the deletion plan itself... just once
					// As a temporary fix: delete only the objects that are still to be deleted...
					if ($oToDelete->m_bIsInDB)
					{
						set_time_limit($iLoopTimeLimit);
						$oToDelete->DBDeleteSingleObject();
					}
				}
			}

			foreach ($oDeletionPlan->ListUpdates() as $sClass => $aToUpdate)
			{
				foreach ($aToUpdate as $iId => $aData)
				{
					$oToUpdate = $aData['to_reset'];
					foreach ($aData['attributes'] as $sRemoteExtKey => $aRemoteAttDef)
					{
						$oToUpdate->Set($sRemoteExtKey, $aData['values'][$sRemoteExtKey]);
						set_time_limit($iLoopTimeLimit);
						$oToUpdate->DBUpdate();
					}
				}
			}

			set_time_limit($iPreviousTimeLimit);
		}

		return $oDeletionPlan;
	}

	public function DBDeleteTracked(CMDBChange $oChange, $bSkipStrongSecurity = null, &$oDeletionPlan = null)
	{
		CMDBObject::SetCurrentChange($oChange);
		$this->DBDelete($oDeletionPlan);
	}

	public function EnumTransitions()
	{
		$sStateAttCode = MetaModel::GetStateAttributeCode(get_class($this));
		if (empty($sStateAttCode)) return array();

		$sState = $this->Get(MetaModel::GetStateAttributeCode(get_class($this)));
		return MetaModel::EnumTransitions(get_class($this), $sState);
	}

	/**
	 * Designed as an action to be called when a stop watch threshold times out
	 * or from within the framework
	 * @param $sStimulusCode
	 * @param bool|false $bDoNotWrite
	 * @return bool
	 * @throws CoreException
	 * @throws CoreUnexpectedValue
	 */
	public function ApplyStimulus($sStimulusCode, $bDoNotWrite = false)
	{
		$sStateAttCode = MetaModel::GetStateAttributeCode(get_class($this));
		if (empty($sStateAttCode))
		{
			throw new CoreException('No lifecycle for the class '.get_class($this));
		}

		MyHelpers::CheckKeyInArray('object lifecycle stimulus', $sStimulusCode, MetaModel::EnumStimuli(get_class($this)));

		$aStateTransitions = $this->EnumTransitions();
		if (!array_key_exists($sStimulusCode, $aStateTransitions))
		{
			// This simulus has no effect in the current state... do nothing
			return true;
		}
		$aTransitionDef = $aStateTransitions[$sStimulusCode];

		// Change the state before proceeding to the actions, this is necessary because an action might
		// trigger another stimuli (alternative: push the stimuli into a queue)
		$sPreviousState = $this->Get($sStateAttCode);
		$sNewState = $aTransitionDef['target_state'];
		$this->Set($sStateAttCode, $sNewState);

		// $aTransitionDef is an
		//    array('target_state'=>..., 'actions'=>array of handlers procs, 'user_restriction'=>TBD

		$bSuccess = true;
		foreach ($aTransitionDef['actions'] as $actionHandler)
		{
			if (is_string($actionHandler))
			{
				// Old (pre-2.1.0 modules) action definition without any parameter
				$aActionCallSpec = array($this, $actionHandler);
				$sActionDesc = get_class($this).'::'.$actionHandler;
	
				if (!is_callable($aActionCallSpec))
				{
					throw new CoreException("Unable to call action: ".get_class($this)."::$actionHandler");
				}
				$bRet = call_user_func($aActionCallSpec, $sStimulusCode);
			}
			else // if (is_array($actionHandler))
			{
				// New syntax: 'verb' and typed parameters
				$sAction = $actionHandler['verb'];
				$sActionDesc = get_class($this).'::'.$sAction;
				$aParams = array();
				foreach($actionHandler['params'] as $aDefinition)
				{
					$sParamType = array_key_exists('type', $aDefinition) ? $aDefinition['type'] : 'string';
					switch($sParamType)
					{
						case 'int':
						$value = (int)$aDefinition['value'];
						break;
						
						case 'float':
						$value = (float)$aDefinition['value'];
						break;
						
						case 'bool':
						$value = (bool)$aDefinition['value'];
						break;
						
						case 'reference':
						$value = ${$aDefinition['value']};
						break;
						
						case 'string':
						default:
						$value = (string)$aDefinition['value'];
					}
					$aParams[] = $value;
				}
				$aCallSpec = array($this, $sAction);
				$bRet = call_user_func_array($aCallSpec, $aParams);
			}
			// if one call fails, the whole is considered as failed
			// (in case there is no returned value, null is obtained and means "ok")
			if ($bRet === false)
			{
				IssueLog::Info("Lifecycle action $sActionDesc returned false on object #".$this->GetKey());
				$bSuccess = false;
			}
		}
		if ($bSuccess)
		{
			$sClass = get_class($this);

			// Stop watches
			foreach(MetaModel::ListAttributeDefs($sClass) as $sAttCode => $oAttDef)
			{
				if ($oAttDef instanceof AttributeStopWatch)
				{
					$oSW = $this->Get($sAttCode);
					if (in_array($sNewState, $oAttDef->GetStates()))
					{
						$oSW->Start($this, $oAttDef);
					}
					else
					{
						$oSW->Stop($this, $oAttDef);
					}
					$this->Set($sAttCode, $oSW);
				}
			}
			
			if (!$bDoNotWrite)
			{
				$this->DBWrite();
			}

			// Change state triggers...
			$sClassList = implode("', '", MetaModel::EnumParentClasses($sClass, ENUM_PARENT_CLASSES_ALL));
			$oSet = new DBObjectSet(DBObjectSearch::FromOQL("SELECT TriggerOnStateLeave AS t WHERE t.target_class IN ('$sClassList') AND t.state='$sPreviousState'"));
			while ($oTrigger = $oSet->Fetch())
			{
				$oTrigger->DoActivate($this->ToArgs('this'));
			}
	
			$oSet = new DBObjectSet(DBObjectSearch::FromOQL("SELECT TriggerOnStateEnter AS t WHERE t.target_class IN ('$sClassList') AND t.state='$sNewState'"));
			while ($oTrigger = $oSet->Fetch())
			{
				$oTrigger->DoActivate($this->ToArgs('this'));
			}
		}

		return $bSuccess;
	}

	/**
	* Designed as an action to be called when a stop watch threshold times out
	*/	
	public function ResetStopWatch($sAttCode)
	{
		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		if (!$oAttDef instanceof AttributeStopWatch)
		{
			throw new CoreException("Invalid stop watch id: '$sAttCode'");
		}
		$oSW = $this->Get($sAttCode);
		$oSW->Reset($this, $oAttDef);
		$this->Set($sAttCode, $oSW);
		return true;
	}

	/**
	 * Lifecycle action: Recover the default value (aka when an object is being created)
	 */	 	
	public function Reset($sAttCode)
	{
		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		$this->Set($sAttCode, $oAttDef->GetDefaultValue($this));
		return true;
	}

	/**
	 * Lifecycle action: Copy an attribute to another
	 */	 	
	public function Copy($sDestAttCode, $sSourceAttCode)
	{
		$this->Set($sDestAttCode, $this->Get($sSourceAttCode));
		return true;
	}

	/**
	 * Lifecycle action: Set the current date/time for the given attribute
	 */	 	
	public function SetCurrentDate($sAttCode)
	{
		$this->Set($sAttCode, time());
		return true;
	}

	/**
	 * Lifecycle action: Set the current logged in user for the given attribute
	 */	 	
	public function SetCurrentUser($sAttCode)
	{
		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		if ($oAttDef instanceof AttributeString)
		{
			// Note: the user friendly name is the contact friendly name if a contact is attached to the logged in user
			$this->Set($sAttCode, UserRights::GetUserFriendlyName());
		}
		else
		{
			if ($oAttDef->IsExternalKey())
			{
				if ($oAttDef->GetTargetClass() != 'User')
				{
					throw new Exception("SetCurrentUser: the attribute $sAttCode must be an external key to 'User', found '".$oAttDef->GetTargetClass()."'");
				}
			}
			$this->Set($sAttCode, UserRights::GetUserId());
		}
		return true;
	}

	/**
	 * Lifecycle action: Set the current logged in CONTACT for the given attribute
	 */	 	
	public function SetCurrentPerson($sAttCode)
	{
		$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
		if ($oAttDef instanceof AttributeString)
		{
			$iPerson = UserRights::GetContactId();
			if ($iPerson == 0)
			{
				$this->Set($sAttCode, '');
			}
			else
			{
				$oPerson = MetaModel::GetObject('Person', $iPerson);
				$this->Set($sAttCode, $oPerson->Get('friendlyname'));
			}
		}
		else
		{
			if ($oAttDef->IsExternalKey())
			{
				if (!MetaModel::IsParentClass($oAttDef->GetTargetClass(), 'Person'))
				{
					throw new Exception("SetCurrentContact: the attribute $sAttCode must be an external key to 'Person' or any other class above 'Person', found '".$oAttDef->GetTargetClass()."'");
				}
			}
			$this->Set($sAttCode, UserRights::GetContactId());
		}
		return true;
	}

	/**
	 * Lifecycle action: Set the time elapsed since a reference point
	 */	 	
	public function SetElapsedTime($sAttCode, $sRefAttCode, $sWorkingTimeComputer = null)
	{
		if (is_null($sWorkingTimeComputer))
		{
			$sWorkingTimeComputer = class_exists('SLAComputation') ? 'SLAComputation' : 'DefaultWorkingTimeComputer';
		}
		$oComputer = new $sWorkingTimeComputer();
		$aCallSpec = array($oComputer, 'GetOpenDuration');
		if (!is_callable($aCallSpec))
		{
			throw new CoreException("Unknown class/verb '$sWorkingTimeComputer/GetOpenDuration'");
		}

		$iStartTime = AttributeDateTime::GetAsUnixSeconds($this->Get($sRefAttCode));
		$oStartDate = new DateTime('@'.$iStartTime); // setTimestamp not available in PHP 5.2
		$oEndDate = new DateTime(); // now

		if (class_exists('WorkingTimeRecorder'))
		{
			$sClass = get_class($this);
			WorkingTimeRecorder::Start($this, time(), "DBObject-SetElapsedTime-$sAttCode-$sRefAttCode", 'Core:ExplainWTC:ElapsedTime', array("Class:$sClass/Attribute:$sAttCode"));
		}
		$iElapsed = call_user_func($aCallSpec, $this, $oStartDate, $oEndDate);
		if (class_exists('WorkingTimeRecorder'))
		{
			WorkingTimeRecorder::End();
		}

		$this->Set($sAttCode, $iElapsed);
		return true;
	}



   	/**
	 * Create query parameters (SELECT ... WHERE service = :this->service_id)
	 * to be used with the APIs DBObjectSearch/DBObjectSet
	 * 		
	 * Starting 2.0.2 the parameters are computed on demand, at the lowest level,
	 * in VariableExpression::Render()		
	 */	
	public function ToArgsForQuery($sArgName = 'this')
	{
		return array($sArgName.'->object()' => $this);
	}

	/**
 	 * Create template placeholders: now equivalent to ToArgsForQuery since the actual
	 * template placeholders are computed on demand.	
	 */
	public function ToArgs($sArgName = 'this')
	{
		return $this->ToArgsForQuery($sArgName);
	}

	public function GetForTemplate($sPlaceholderAttCode)
	{
		$ret = null;
		if (preg_match('/^([^-]+)-(>|&gt;)(.+)$/', $sPlaceholderAttCode, $aMatches)) // Support both syntaxes: this->xxx or this-&gt;xxx for HTML compatibility
		{
			$sExtKeyAttCode = $aMatches[1];
			$sRemoteAttCode = $aMatches[3];
			if (!MetaModel::IsValidAttCode(get_class($this), $sExtKeyAttCode))
			{
				throw new CoreException("Unknown attribute '$sExtKeyAttCode' for the class ".get_class($this));
			}
			
			$oKeyAttDef = MetaModel::GetAttributeDef(get_class($this), $sExtKeyAttCode);
			if (!$oKeyAttDef instanceof AttributeExternalKey)
			{
				throw new CoreException("'$sExtKeyAttCode' is not an external key of the class ".get_class($this));
			}
			$sRemoteClass = $oKeyAttDef->GetTargetClass();
			$oRemoteObj = MetaModel::GetObject($sRemoteClass, $this->GetStrict($sExtKeyAttCode), false);
			if (is_null($oRemoteObj))
			{
				$ret = Dict::S('UI:UndefinedObject');
			}
			else
			{
				// Recurse
				$ret  = $oRemoteObj->GetForTemplate($sRemoteAttCode);
			}
		}
		else 
		{
			switch($sPlaceholderAttCode)
			{
				case 'id':
				$ret = $this->GetKey();
				break;
				
				case 'name()':
				$ret = $this->GetName();
				break;

				default:
				if (preg_match('/^([^(]+)\\((.*)\\)$/', $sPlaceholderAttCode, $aMatches))
				{
					$sVerb = $aMatches[1];
					$sAttCode = $aMatches[2];
				}
				else
				{
					$sVerb = '';
					$sAttCode = $sPlaceholderAttCode;
				}

				if ($sVerb == 'hyperlink')
				{
					$sPortalId = ($sAttCode === '') ? 'console' : $sAttCode;
					if (!array_key_exists($sPortalId, self::$aPortalToURLMaker))
					{
						throw new Exception("Unknown portal id '$sPortalId' in placeholder '$sPlaceholderAttCode''");
					}
					$ret = $this->GetHyperlink(self::$aPortalToURLMaker[$sPortalId], false);
				}
				else
				{
					$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
					$ret = $oAttDef->GetForTemplate($this->Get($sAttCode), $sVerb, $this);
				}
			}
			if ($ret === null)
			{
				$ret = '';
			}
		}
		return $ret;
	}

	static protected $aPortalToURLMaker = array('console' => 'iTopStandardURLMaker', 'portal' => 'PortalURLMaker');

	/**
	 * Associate a portal to a class that implements iDBObjectURLMaker,
	 * and which will be invoked with placeholders like $this->org_id->hyperlink(portal)$
	 *
	 * @param $sPortalId Identifies the portal. Conventions: the main portal is 'console', The user requests portal is 'portal'.
	 * @param $sUrlMakerClass
	 */
	static public function RegisterURLMakerClass($sPortalId, $sUrlMakerClass)
	{
		self::$aPortalToURLMaker[$sPortalId] = $sUrlMakerClass;
	}

	// To be optionaly overloaded
	protected function OnInsert()
	{
	}
	
	// To be optionaly overloaded
	protected function AfterInsert()
	{
	}

	// To be optionaly overloaded
	protected function OnUpdate()
	{
	}

	// To be optionaly overloaded
	protected function AfterUpdate()
	{
	}

	// To be optionaly overloaded
	protected function OnDelete()
	{
	}

	// To be optionaly overloaded
	protected function AfterDelete()
	{
	}


	/**
	 * Common to the recording of link set changes (add/remove/modify)	
	 */	
	private function PrepareChangeOpLinkSet($iLinkSetOwnerId, $oLinkSet, $sChangeOpClass, $aOriginalValues = null)
	{
		if ($iLinkSetOwnerId <= 0)
		{
			return null;
		}

		if (!is_subclass_of($oLinkSet->GetHostClass(), 'CMDBObject'))
		{
			// The link set owner class does not keep track of its history
			return null;
		}

		// Determine the linked item class and id
		//
		if ($oLinkSet->IsIndirect())
		{
			// The "item" is on the other end (N-N links)
			$sExtKeyToRemote = $oLinkSet->GetExtKeyToRemote();
			$oExtKeyToRemote = MetaModel::GetAttributeDef(get_class($this), $sExtKeyToRemote);
			$sItemClass = $oExtKeyToRemote->GetTargetClass();
			if ($aOriginalValues)
			{
				// Get the value from the original values
				$iItemId = $aOriginalValues[$sExtKeyToRemote];
			}
			else
			{
				$iItemId = $this->Get($sExtKeyToRemote);
			}
		}
		else
		{
			// I am the "item" (1-N links)
			$sItemClass = get_class($this);
			$iItemId = $this->GetKey();
		}

		// Get the remote object, to determine its exact class
		// Possible optimization: implement a tool in MetaModel, to get the final class of an object (not always querying + query reduced to a select on the root table!
		$oOwner = MetaModel::GetObject($oLinkSet->GetHostClass(), $iLinkSetOwnerId, false);
		if ($oOwner)
		{
			$sLinkSetOwnerClass = get_class($oOwner);
			
			$oMyChangeOp = MetaModel::NewObject($sChangeOpClass);
			$oMyChangeOp->Set("objclass", $sLinkSetOwnerClass);
			$oMyChangeOp->Set("objkey", $iLinkSetOwnerId);
			$oMyChangeOp->Set("attcode", $oLinkSet->GetCode());
			$oMyChangeOp->Set("item_class", $sItemClass);
			$oMyChangeOp->Set("item_id", $iItemId);
			return $oMyChangeOp;
		}
		else
		{
			// Depending on the deletion order, it may happen that the id is already invalid... ignore
			return null;
		}
	}

	/**
	 *  This object has been created/deleted, record that as a change in link sets pointing to this (if any)
	 */	
	private function RecordLinkSetListChange($bAdd = true)
	{
		$aForwardChangeTracking = MetaModel::GetTrackForwardExternalKeys(get_class($this));
		foreach(MetaModel::GetTrackForwardExternalKeys(get_class($this)) as $sExtKeyAttCode => $oLinkSet)
		{
			if (($oLinkSet->GetTrackingLevel() & LINKSET_TRACKING_LIST) == 0) continue;
			
			$iLinkSetOwnerId  = $this->Get($sExtKeyAttCode);
			$oMyChangeOp = $this->PrepareChangeOpLinkSet($iLinkSetOwnerId, $oLinkSet, 'CMDBChangeOpSetAttributeLinksAddRemove');
			if ($oMyChangeOp)
			{
				if ($bAdd)
				{
					$oMyChangeOp->Set("type", "added");
				}
				else
				{
					$oMyChangeOp->Set("type", "removed");
				}
				$iId = $oMyChangeOp->DBInsertNoReload();
			}
		}
	}

	protected function RecordObjCreation()
	{
		$this->RecordLinkSetListChange(true);
	}

	protected function RecordObjDeletion($objkey)
	{
		$this->RecordLinkSetListChange(false);
	}

	protected function RecordAttChanges(array $aValues, array $aOrigValues)
	{
		$aForwardChangeTracking = MetaModel::GetTrackForwardExternalKeys(get_class($this));
		foreach(MetaModel::GetTrackForwardExternalKeys(get_class($this)) as $sExtKeyAttCode => $oLinkSet)
		{

			if (array_key_exists($sExtKeyAttCode, $aValues))
			{
				if (($oLinkSet->GetTrackingLevel() & LINKSET_TRACKING_LIST) == 0) continue;

				// Keep track of link added/removed
				//
				$iLinkSetOwnerNext = $aValues[$sExtKeyAttCode];
				$oMyChangeOp = $this->PrepareChangeOpLinkSet($iLinkSetOwnerNext, $oLinkSet, 'CMDBChangeOpSetAttributeLinksAddRemove');
				if ($oMyChangeOp)
				{
					$oMyChangeOp->Set("type", "added");
					$oMyChangeOp->DBInsertNoReload();
				}

				$iLinkSetOwnerPrevious = $aOrigValues[$sExtKeyAttCode];
				$oMyChangeOp = $this->PrepareChangeOpLinkSet($iLinkSetOwnerPrevious, $oLinkSet, 'CMDBChangeOpSetAttributeLinksAddRemove', $aOrigValues);
				if ($oMyChangeOp)
				{
					$oMyChangeOp->Set("type", "removed");
					$oMyChangeOp->DBInsertNoReload();
				}
			}
			else
			{
				// Keep track of link changes
				//
				if (($oLinkSet->GetTrackingLevel() & LINKSET_TRACKING_DETAILS) == 0) continue;
				
				$iLinkSetOwnerId  = $this->Get($sExtKeyAttCode);
				$oMyChangeOp = $this->PrepareChangeOpLinkSet($iLinkSetOwnerId, $oLinkSet, 'CMDBChangeOpSetAttributeLinksTune');
				if ($oMyChangeOp)
				{
					$oMyChangeOp->Set("link_id", $this->GetKey());
					$iId = $oMyChangeOp->DBInsertNoReload();
				}
			}
		}
	}

	// Return an empty set for the parent of all
	// May be overloaded.
	// Anyhow, this way of implementing the relations suffers limitations (not handling the redundancy)
	// and you should consider defining those things in XML.
	public static function GetRelationQueries($sRelCode)
	{
		return array();
	}
	
	// Reserved: do not overload
	public static function GetRelationQueriesEx($sRelCode)
	{
		return array();
	}

	/**
	 * Will be deprecated soon - use GetRelatedObjectsDown/Up instead to take redundancy into account
	 */
	public function GetRelatedObjects($sRelCode, $iMaxDepth = 99, &$aResults = array())
	{
		// Temporary patch: until the impact analysis GUI gets rewritten,
		// let's consider that "depends on" is equivalent to "impacts/up"
		// The current patch has been implemented in DBObject and MetaModel
		$sHackedRelCode = $sRelCode;
		$bDown = true;
		if ($sRelCode == 'depends on')
		{
			$sHackedRelCode = 'impacts';
			$bDown = false;
		}
		foreach (MetaModel::EnumRelationQueries(get_class($this), $sHackedRelCode, $bDown) as $sDummy => $aQueryInfo)
		{
			$sQuery = $bDown ? $aQueryInfo['sQueryDown'] : $aQueryInfo['sQueryUp'];
			//$bPropagate = $aQueryInfo["bPropagate"];
			//$iDepth = $bPropagate ? $iMaxDepth - 1 : 0;
			$iDepth = $iMaxDepth - 1;

			// Note: the loop over the result set has been written in an unusual way for error reporting purposes
			// In the case of a wrong query parameter name, the error occurs on the first call to Fetch,
			// thus we need to have this first call into the try/catch, but
			// we do NOT want to nest the try/catch for the error message to be clear
			try
			{
				$oFlt = DBObjectSearch::FromOQL($sQuery);
				$oObjSet = new DBObjectSet($oFlt, array(), $this->ToArgsForQuery());
				$oObj = $oObjSet->Fetch();
			}
			catch (Exception $e)
			{
				$sClassOfDefinition = $aQueryInfo['_legacy_'] ? get_class($this).'(or a parent)::GetRelationQueries()' : $aQueryInfo['sDefinedInClass'];
				throw new Exception("Wrong query for the relation $sRelCode/$sClassOfDefinition/{$aQueryInfo['sNeighbour']}: ".$e->getMessage());
			}
			if ($oObj)
			{
				do
				{
					$sRootClass = MetaModel::GetRootClass(get_class($oObj));
					$sObjKey = $oObj->GetKey();
					if (array_key_exists($sRootClass, $aResults))
					{
						if (array_key_exists($sObjKey, $aResults[$sRootClass]))
						{
							continue; // already visited, skip
						}
					}
	
					$aResults[$sRootClass][$sObjKey] = $oObj;
					if ($iDepth > 0)
					{
						$oObj->GetRelatedObjects($sRelCode, $iDepth, $aResults);
					}
				}
				while ($oObj = $oObjSet->Fetch());
			}
		}
		return $aResults;
	}
	
	/**
	 * Compute the "RelatedObjects" (forward or "down" direction) for the object
	 * for the specified relation
	 *
	 * @param string $sRelCode The code of the relation to use for the computation
	 * @param int $iMaxDepth Maximum recursion depth
	 * @param boolean $bEnableReduncancy Whether or not to take into account the redundancy
	 *
	 * @return RelationGraph The graph of all the related objects
	 */
	public function GetRelatedObjectsDown($sRelCode, $iMaxDepth = 99, $bEnableRedundancy = true)
	{
		$oGraph = new RelationGraph();
		$oGraph->AddSourceObject($this);
		$oGraph->ComputeRelatedObjectsDown($sRelCode, $iMaxDepth, $bEnableRedundancy);
		return $oGraph;
	}
	
	/**
	 * Compute the "RelatedObjects" (reverse or "up" direction) for the object
	 * for the specified relation
	 *
	 * @param string $sRelCode The code of the relation to use for the computation
	 * @param int $iMaxDepth Maximum recursion depth
	 * @param boolean $bEnableReduncancy Whether or not to take into account the redundancy
	 *
	 * @return RelationGraph The graph of all the related objects
	 */
	public function GetRelatedObjectsUp($sRelCode, $iMaxDepth = 99, $bEnableRedundancy = true)
	{
		$oGraph = new RelationGraph();
		$oGraph->AddSourceObject($this);
		$oGraph->ComputeRelatedObjectsUp($sRelCode, $iMaxDepth, $bEnableRedundancy);
		return $oGraph;
	}
	
	public function GetReferencingObjects($bAllowAllData = false)
	{
		$aDependentObjects = array();
		$aRererencingMe = MetaModel::EnumReferencingClasses(get_class($this));
		foreach($aRererencingMe as $sRemoteClass => $aExtKeys)
		{
			foreach($aExtKeys as $sExtKeyAttCode => $oExtKeyAttDef)
			{
				// skip if this external key is behind an external field
				if (!$oExtKeyAttDef->IsExternalKey(EXTKEY_ABSOLUTE)) continue;

				$oSearch = new DBObjectSearch($sRemoteClass);
				$oSearch->AddCondition($sExtKeyAttCode, $this->GetKey(), '=');
				if ($bAllowAllData)
				{
					$oSearch->AllowAllData();
				}
				$oSet = new CMDBObjectSet($oSearch);
				if ($oSet->Count() > 0)
				{
					$aDependentObjects[$sRemoteClass][$sExtKeyAttCode] = array(
						'attribute' => $oExtKeyAttDef,
						'objects' => $oSet,
					);
				}
			}
		}
		return $aDependentObjects;
	}

	private function MakeDeletionPlan(&$oDeletionPlan, $aVisited = array(), $iDeleteOption = null)
	{
		static $iLoopTimeLimit = null;
		if ($iLoopTimeLimit == null)
		{
			$iLoopTimeLimit = MetaModel::GetConfig()->Get('max_execution_time_per_loop');
		}
		$sClass = get_class($this);
		$iThisId = $this->GetKey();

		$iDeleteOption = $oDeletionPlan->AddToDelete($this, $iDeleteOption);

		if (array_key_exists($sClass, $aVisited))
		{
			if (in_array($iThisId, $aVisited[$sClass]))
			{
				return;
			}
		}
		$aVisited[$sClass] = $iThisId;

		if ($iDeleteOption == DEL_MANUAL)
		{
			// Stop the recursion here
			return;
		}
		// Check the node itself
		$this->DoCheckToDelete($oDeletionPlan);
		$oDeletionPlan->SetDeletionIssues($this, $this->m_aDeleteIssues, $this->m_bSecurityIssue);
	
		$aDependentObjects = $this->GetReferencingObjects(true /* allow all data */);

		// Getting and setting time limit are not symetric:
		// www.php.net/manual/fr/function.set-time-limit.php#72305
		$iPreviousTimeLimit = ini_get('max_execution_time');

		foreach ($aDependentObjects as $sRemoteClass => $aPotentialDeletes)
		{
			foreach ($aPotentialDeletes as $sRemoteExtKey => $aData)
			{
				set_time_limit($iLoopTimeLimit);

				$oAttDef = $aData['attribute'];
				$iDeletePropagationOption = $oAttDef->GetDeletionPropagationOption();
				$oDepSet = $aData['objects'];
				$oDepSet->Rewind();
				while ($oDependentObj = $oDepSet->fetch())
				{
					$iId = $oDependentObj->GetKey();
					if ($oAttDef->IsNullAllowed())
					{
						// Optional external key, list to reset
						if (($iDeletePropagationOption == DEL_MOVEUP) && ($oAttDef->IsHierarchicalKey()))
						{
							// Move the child up one level i.e. set the same parent as the current object
							$iParentId = $this->Get($oAttDef->GetCode());
							$oDeletionPlan->AddToUpdate($oDependentObj, $oAttDef, $iParentId);
						}
						else
						{
							$oDeletionPlan->AddToUpdate($oDependentObj, $oAttDef);
						}
					}
					else
					{
						// Mandatory external key, list to delete
						$oDependentObj->MakeDeletionPlan($oDeletionPlan, $aVisited, $iDeletePropagationOption);
					}
				}
			}
		}
		set_time_limit($iPreviousTimeLimit);
	}

	/**
	 * WILL DEPRECATED SOON
	 * Caching relying on an object set is not efficient since 2.0.3
	 * Use GetSynchroData instead
	 * 	 
	 * Get all the synchro replica related to this object
	 * @param none
	 * @return DBObjectSet Set with two columns: R=SynchroReplica S=SynchroDataSource
	 */
	public function GetMasterReplica()
	{
		$sOQL = "SELECT replica,datasource FROM SynchroReplica AS replica JOIN SynchroDataSource AS datasource ON replica.sync_source_id=datasource.id WHERE replica.dest_class = :dest_class AND replica.dest_id = :dest_id";
		$oReplicaSet = new DBObjectSet(DBObjectSearch::FromOQL($sOQL), array() /* order by*/, array('dest_class' => get_class($this), 'dest_id' => $this->GetKey()));
		return $oReplicaSet;
	}

	/**
	 * Get all the synchro data related to this object
	 * @param none
	 * @return array of data_source_id => array
	 * 	'source' => $oSource,
	 * 	'attributes' => array of $oSynchroAttribute
	 * 	'replica' => array of $oReplica (though only one should exist, misuse of the data sync can have this consequence)
	 */
	public function GetSynchroData()
	{
		if (is_null($this->m_aSynchroData))
		{
			$sOQL = "SELECT replica,datasource FROM SynchroReplica AS replica JOIN SynchroDataSource AS datasource ON replica.sync_source_id=datasource.id WHERE replica.dest_class = :dest_class AND replica.dest_id = :dest_id";
			$oReplicaSet = new DBObjectSet(DBObjectSearch::FromOQL($sOQL), array() /* order by*/, array('dest_class' => get_class($this), 'dest_id' => $this->GetKey()));
			$this->m_aSynchroData = array();
			while($aData = $oReplicaSet->FetchAssoc())
			{
				$iSourceId = $aData['datasource']->GetKey();
				if (!array_key_exists($iSourceId, $this->m_aSynchroData))
				{
					$aAttributes = array();
					$oAttrSet = $aData['datasource']->Get('attribute_list');
					while($oSyncAttr = $oAttrSet->Fetch())
					{
						$aAttributes[$oSyncAttr->Get('attcode')] = $oSyncAttr;
					}
					$this->m_aSynchroData[$iSourceId] = array(
						'source' => $aData['datasource'],
						'attributes' => $aAttributes,
						'replica' => array()
					);
				}
				// Assumption: $aData['datasource'] will not be null because the data source id is always set...
				$this->m_aSynchroData[$iSourceId]['replica'][] = $aData['replica'];
			}
		}
		return $this->m_aSynchroData;
	}
	
	public function GetSynchroReplicaFlags($sAttCode, &$aReason)
	{
		$iFlags = OPT_ATT_NORMAL;
		foreach ($this->GetSynchroData() as $iSourceId => $aSourceData)
		{
			if ($iSourceId == SynchroExecution::GetCurrentTaskId())
			{
				// Ignore the current task (check to write => ok)
				continue;
			}
			// Assumption: one replica - take the first one!
			$oReplica = reset($aSourceData['replica']);
			$oSource = $aSourceData['source'];
			if (array_key_exists($sAttCode, $aSourceData['attributes']))
			{
				$oSyncAttr = $aSourceData['attributes'][$sAttCode];
				if (($oSyncAttr->Get('update') == 1) && ($oSyncAttr->Get('update_policy') == 'master_locked'))
				{
					$iFlags |= OPT_ATT_SLAVE;
					$sUrl = $oSource->GetApplicationUrl($this, $oReplica);
					$aReason[] = array('name' => $oSource->GetName(), 'description' => $oSource->Get('description'), 'url_application' => $sUrl);
				}
			}
		}
		return $iFlags;
	}

	public function InSyncScope()
	{
		//
		// Optimization: cache the list of Data Sources and classes candidates for synchro
		//
		static $aSynchroClasses = null;
		if (is_null($aSynchroClasses))
		{
			$aSynchroClasses = array();
			$sOQL = "SELECT SynchroDataSource AS datasource";
			$oSourceSet = new DBObjectSet(DBObjectSearch::FromOQL($sOQL), array() /* order by*/, array());
			while($oSource = $oSourceSet->Fetch())
			{
				$sTarget = $oSource->Get('scope_class');
				$aSynchroClasses[] = $sTarget;
			}
		}
		
		foreach($aSynchroClasses as $sClass)
		{
			if ($this instanceof $sClass)
			{
				return true;
			}
		}
		return false;
	}
	/////////////////////////////////////////////////////////////////////////
	//
	// Experimental iDisplay implementation
	//
	/////////////////////////////////////////////////////////////////////////
	
	public static function MapContextParam($sContextParam)
	{
		return null;
	}
	
	public function GetHilightClass()
	{
		$sCode = $this->ComputeHighlightCode();
		if($sCode != '')
		{
			$aHighlightScale = MetaModel::GetHighlightScale(get_class($this));
			if (array_key_exists($sCode, $aHighlightScale))
			{
				return $aHighlightScale[$sCode]['color'];
			}
		}
		return HILIGHT_CLASS_NONE;
	}

	public function DisplayDetails(WebPage $oPage, $bEditMode = false)
	{
		$oPage->add('<h1>'.MetaModel::GetName(get_class($this)).': '.$this->GetName().'</h1>');
		$aValues = array();
		$aList = MetaModel::FlattenZList(MetaModel::GetZListItems(get_class($this), 'details'));
		if (empty($aList))
		{
			$aList = array_keys(MetaModel::ListAttributeDefs(get_class($this)));
		}
		foreach($aList as $sAttCode)
		{
			$aValues[$sAttCode] = array('label' => MetaModel::GetLabel(get_class($this), $sAttCode), 'value' => $this->GetAsHTML($sAttCode));
		}
		$oPage->details($aValues);
	}


	const CALLBACK_AFTERINSERT = 0;

	/**
	 * Register a call back that will be called when some internal event happens
	 *	 
	 * @param $iType string Any of the CALLBACK_x constants
	 * @param $callback callable Call specification like a function name, or array('<class>', '<method>') or array($object, '<method>')
	 * @param $aParameters Array Values that will be passed to the callback, after $this
	 */	 	
	public function RegisterCallback($iType, $callback, $aParameters = array())
	{
		$sCallBackName = '';
		if (!is_callable($callback, false, $sCallBackName))
		{
			throw new Exception('Registering an unknown/protected function or wrong syntax for the call spec: '.$sCallBackName);
		}
		$this->m_aCallbacks[$iType][] = array(
			'callback' => $callback,
			'params' => $aParameters
		);
	}

	/**
	 * Computes a text-like fingerprint identifying the content of the object
	 * but excluding the specified columns
	 * @param $aExcludedColumns array The list of columns to exclude
	 * @return string
	 */
	public function Fingerprint($aExcludedColumns = array())
	{
		$sFingerprint = '';
		foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode => $oAttDef)
		{
			if (!in_array($sAttCode, $aExcludedColumns))
			{
				if ($oAttDef->IsPartOfFingerprint())
				{
					$sFingerprint .= chr(0).$oAttDef->Fingerprint($this->Get($sAttCode));
				}
			}
		}
		return $sFingerprint;
	}

	/**
	 * Execute a set of scripted actions onto the current object
	 * See ExecAction for the syntax and features of the scripted actions
	 *
	 * @param $aActions array of statements (e.g. "set(name, Made after $source->name$)")
	 * @param $aSourceObjects Array of Alias => Context objects (Convention: some statements require the 'source' element
	 * @throws Exception
	 */
	public function ExecActions($aActions, $aSourceObjects)
	{
		foreach($aActions as $sAction)
		{
			try
			{
				if (preg_match('/^(\S*)\s*\((.*)\)$/ms', $sAction, $aMatches)) // multiline and newline matched by a dot
				{
					$sVerb = trim($aMatches[1]);
					$sParams = $aMatches[2];

					// the coma is the separator for the parameters
					// comas can be escaped: \,
					$sParams = str_replace(array("\\\\", "\\,"), array("__backslash__", "__coma__"), $sParams);
					$sParams = trim($sParams);

					if (strlen($sParams) == 0)
					{
						$aParams = array();
					}
					else
					{
						$aParams = explode(',', $sParams);
						foreach ($aParams as &$sParam)
						{
							$sParam = str_replace(array("__backslash__", "__coma__"), array("\\", ","), $sParam);
							$sParam = trim($sParam);
						}
					}
					$this->ExecAction($sVerb, $aParams, $aSourceObjects);
				}
				else
				{
					throw new Exception("Invalid syntax");
				}
			}
			catch(Exception $e)
			{
				throw new Exception('Action: '.$sAction.' - '.$e->getMessage());
			}
		}
	}

	/**
	 * Helper to copy an attribute between two objects (in memory)
	 * Originally designed for ExecAction()
	 */
	public function CopyAttribute($oSourceObject, $sSourceAttCode, $sDestAttCode)
	{
		if ($sSourceAttCode == 'id')
		{
			$oSourceAttDef = null;
		}
		else
		{
			if (!MetaModel::IsValidAttCode(get_class($this), $sDestAttCode))
			{
				throw new Exception("Unknown attribute ".get_class($this)."::".$sDestAttCode);
			}
			if (!MetaModel::IsValidAttCode(get_class($oSourceObject), $sSourceAttCode))
			{
				throw new Exception("Unknown attribute ".get_class($oSourceObject)."::".$sSourceAttCode);
			}

			$oSourceAttDef = MetaModel::GetAttributeDef(get_class($oSourceObject), $sSourceAttCode);
		}
		if (is_object($oSourceAttDef) && $oSourceAttDef->IsLinkSet())
		{
			// The copy requires that we create a new object set (the semantic of DBObject::Set is unclear about link sets)
			$oDestSet = DBObjectSet::FromScratch($oSourceAttDef->GetLinkedClass());
			$oSourceSet = $oSourceObject->Get($sSourceAttCode);
			$oSourceSet->Rewind();
			while ($oSourceLink = $oSourceSet->Fetch())
			{
				// Clone the link
				$sLinkClass = get_class($oSourceLink);
				$oLinkClone = MetaModel::NewObject($sLinkClass);
				foreach(MetaModel::ListAttributeDefs($sLinkClass) as $sAttCode => $oAttDef)
				{
					// As of now, ignore other attribute (do not attempt to recurse!)
					if ($oAttDef->IsScalar())
					{
						$oLinkClone->Set($sAttCode, $oSourceLink->Get($sAttCode));
					}
				}

				// Not necessary - this will be handled by DBObject
				// $oLinkClone->Set($oSourceAttDef->GetExtKeyToMe(), 0);
				$oDestSet->AddObject($oLinkClone);
			}
			$this->Set($sDestAttCode, $oDestSet);
		}
		else
		{
			$this->Set($sDestAttCode, $oSourceObject->Get($sSourceAttCode));
		}
	}

	/**
	 * Execute a scripted action onto the current object
	 *    - clone (att1, att2, att3, ...)
	 *    - clone_scalars ()
	 *    - copy (source_att, dest_att)
	 *    - reset (att)
	 *    - nullify (att)
	 *    - set (att, value (placeholders $source->att$ or $current_date$, or $current_contact_id$, ...))
	 *    - append (att, value (placeholders $source->att$ or $current_date$, or $current_contact_id$, ...))
	 *    - add_to_list (source_key_att, dest_att)
	 *    - add_to_list (source_key_att, dest_att, lnk_att, lnk_att_value)
	 *    - apply_stimulus (stimulus)
	 *    - call_method (method_name)
	 *
	 * @param $sVerb string Any of the verb listed above (e.g. "set")
	 * @param $aParams array of strings (e.g. array('name', 'copied from $source->name$')
	 * @param $aSourceObjects Array of Alias => Context objects (Convention: some statements require the 'source' element
	 * @throws CoreException
	 * @throws CoreUnexpectedValue
	 * @throws Exception
	 */
	public function ExecAction($sVerb, $aParams, $aSourceObjects)
	{
		switch($sVerb)
		{
			case 'clone':
				if (!array_key_exists('source', $aSourceObjects))
				{
					throw new Exception('Missing conventional "source" object');
				}
				$oObjectToRead = $aSourceObjects['source'];
				foreach($aParams as $sAttCode)
				{
					$this->CopyAttribute($oObjectToRead, $sAttCode, $sAttCode);
				}
				break;

			case 'clone_scalars':
				if (!array_key_exists('source', $aSourceObjects))
				{
					throw new Exception('Missing conventional "source" object');
				}
				$oObjectToRead = $aSourceObjects['source'];
				foreach(MetaModel::ListAttributeDefs(get_class($this)) as $sAttCode => $oAttDef)
				{
					if ($oAttDef->IsScalar())
					{
						$this->CopyAttribute($oObjectToRead, $sAttCode, $sAttCode);
					}
				}
				break;

			case 'copy':
				if (!array_key_exists('source', $aSourceObjects))
				{
					throw new Exception('Missing conventional "source" object');
				}
				$oObjectToRead = $aSourceObjects['source'];
				if (!array_key_exists(0, $aParams))
				{
					throw new Exception('Missing argument #1: source attribute');
				}
				$sSourceAttCode = $aParams[0];
				if (!array_key_exists(1, $aParams))
				{
					throw new Exception('Missing argument #2: target attribute');
				}
				$sDestAttCode = $aParams[1];
				$this->CopyAttribute($oObjectToRead, $sSourceAttCode, $sDestAttCode);
				break;

			case 'reset':
				if (!array_key_exists(0, $aParams))
				{
					throw new Exception('Missing argument #1: target attribute');
				}
				$sAttCode = $aParams[0];
				if (!MetaModel::IsValidAttCode(get_class($this), $sAttCode))
				{
					throw new Exception("Unknown attribute ".get_class($this)."::".$sAttCode);
				}
				$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
				$this->Set($sAttCode, $oAttDef->GetDefaultValue());
				break;

			case 'nullify':
				if (!array_key_exists(0, $aParams))
				{
					throw new Exception('Missing argument #1: target attribute');
				}
				$sAttCode = $aParams[0];
				if (!MetaModel::IsValidAttCode(get_class($this), $sAttCode))
				{
					throw new Exception("Unknown attribute ".get_class($this)."::".$sAttCode);
				}
				$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
				$this->Set($sAttCode, $oAttDef->GetNullValue());
				break;

			case 'set':
				if (!array_key_exists(0, $aParams))
				{
					throw new Exception('Missing argument #1: target attribute');
				}
				$sAttCode = $aParams[0];
				if (!MetaModel::IsValidAttCode(get_class($this), $sAttCode))
				{
					throw new Exception("Unknown attribute ".get_class($this)."::".$sAttCode);
				}
				if (!array_key_exists(1, $aParams))
				{
					throw new Exception('Missing argument #2: value to set');
				}
				$sRawValue = $aParams[1];
				$aContext = array();
				foreach ($aSourceObjects as $sAlias => $oObject)
				{
					$aContext = array_merge($aContext, $oObject->ToArgs($sAlias));
				}
				$aContext['current_contact_id'] = UserRights::GetContactId();
				$aContext['current_contact_friendlyname'] = UserRights::GetUserFriendlyName();
				$aContext['current_date'] = date(AttributeDate::GetSQLFormat());
				$aContext['current_time'] = date(AttributeDateTime::GetSQLTimeFormat());
				$sValue = MetaModel::ApplyParams($sRawValue, $aContext);
				$this->Set($sAttCode, $sValue);
				break;

			case 'append':
				if (!array_key_exists(0, $aParams))
				{
					throw new Exception('Missing argument #1: target attribute');
				}
				$sAttCode = $aParams[0];
				if (!MetaModel::IsValidAttCode(get_class($this), $sAttCode))
				{
					throw new Exception("Unknown attribute ".get_class($this)."::".$sAttCode);
				}
				if (!array_key_exists(1, $aParams))
				{
					throw new Exception('Missing argument #2: value to append');
				}
				$sRawAddendum = $aParams[1];
				$aContext = array();
				foreach ($aSourceObjects as $sAlias => $oObject)
				{
					$aContext = array_merge($aContext, $oObject->ToArgs($sAlias));
				}
				$aContext['current_contact_id'] = UserRights::GetContactId();
				$aContext['current_contact_friendlyname'] = UserRights::GetUserFriendlyName();
				$aContext['current_date'] = date(AttributeDate::GetSQLFormat());
				$aContext['current_time'] = date(AttributeDateTime::GetSQLTimeFormat());
				$sAddendum = MetaModel::ApplyParams($sRawAddendum, $aContext);
				$this->Set($sAttCode, $this->Get($sAttCode).$sAddendum);
				break;

			case 'add_to_list':
				if (!array_key_exists('source', $aSourceObjects))
				{
					throw new Exception('Missing conventional "source" object');
				}
				$oObjectToRead = $aSourceObjects['source'];
				if (!array_key_exists(0, $aParams))
				{
					throw new Exception('Missing argument #1: source attribute');
				}
				$sSourceKeyAttCode = $aParams[0];
				if (($sSourceKeyAttCode != 'id') && !MetaModel::IsValidAttCode(get_class($oObjectToRead), $sSourceKeyAttCode))
				{
					throw new Exception("Unknown attribute ".get_class($oObjectToRead)."::".$sSourceKeyAttCode);
				}
				if (!array_key_exists(1, $aParams))
				{
					throw new Exception('Missing argument #2: target attribute (link set)');
				}
				$sTargetListAttCode = $aParams[1]; // indirect !!!
				if (!MetaModel::IsValidAttCode(get_class($this), $sTargetListAttCode))
				{
					throw new Exception("Unknown attribute ".get_class($this)."::".$sTargetListAttCode);
				}
				if (isset($aParams[2]) && isset($aParams[3]))
				{
					$sRoleAttCode = $aParams[2];
					$sRoleValue = $aParams[3];
				}

				$iObjKey = $oObjectToRead->Get($sSourceKeyAttCode);
				if ($iObjKey > 0)
				{
					$oLinkSet = $this->Get($sTargetListAttCode);

					$oListAttDef = MetaModel::GetAttributeDef(get_class($this), $sTargetListAttCode);
					$oLnk = MetaModel::NewObject($oListAttDef->GetLinkedClass());
					$oLnk->Set($oListAttDef->GetExtKeyToRemote(), $iObjKey);
					if (isset($sRoleAttCode))
					{
						if (!MetaModel::IsValidAttCode(get_class($oLnk), $sRoleAttCode))
						{
							throw new Exception("Unknown attribute ".get_class($oLnk)."::".$sRoleAttCode);
						}
						$oLnk->Set($sRoleAttCode, $sRoleValue);
					}
					$oLinkSet->AddObject($oLnk);
					$this->Set($sTargetListAttCode, $oLinkSet);
				}
				break;

			case 'apply_stimulus':
				if (!array_key_exists(0, $aParams))
				{
					throw new Exception('Missing argument #1: stimulus');
				}
				$sStimulus = $aParams[0];
				if (!in_array($sStimulus, MetaModel::EnumStimuli(get_class($this))))
				{
					throw new Exception("Unknown stimulus ".get_class($this)."::".$sStimulus);
				}
				$this->ApplyStimulus($sStimulus);
				break;

			case 'call_method':
				if (!array_key_exists('source', $aSourceObjects))
				{
					throw new Exception('Missing conventional "source" object');
				}
				$oObjectToRead = $aSourceObjects['source'];
				if (!array_key_exists(0, $aParams))
				{
					throw new Exception('Missing argument #1: method name');
				}
				$sMethod = $aParams[0];
				$aCallSpec = array($this, $sMethod);
				if (!is_callable($aCallSpec))
				{
					throw new Exception("Unknown method ".get_class($this)."::".$sMethod.'()');
				}
				// Note: $oObjectToRead has been preserved when adding $aSourceObjects, so as to remain backward compatible with methods having only 1 parameter ($oObjectToRead�
				call_user_func($aCallSpec, $oObjectToRead, $aSourceObjects);
				break;

			default:
				throw new Exception("Invalid verb");
		}
	}
}