<?

// Position a string within an OQL query
// This is a must if we want to be able to pinpoint an error at any stage of the query interpretation
// In particular, the normalization phase requires this
class OqlName
{
	protected $m_sValue;
	protected $m_iPos;

	public function __construct($sValue, $iPos)
	{
		$this->m_iPos = $iPos;
		$this->m_sValue = $sValue;
	}

	public function GetValue()
	{
		return $this->m_sValue;
	}

	public function GetPos()
	{
		return $this->m_iPos;
	}
	
	public function __toString()
	{
		return $this->m_sValue;
	} 
}

class OqlJoinSpec
{
	protected $m_oClass;
	protected $m_oClassAlias;
	protected $m_oLeftField;
	protected $m_oRightField;

	protected $m_oNextJoinspec;

	public function __construct($oClass, $oClassAlias, BinaryExpression $oExpression)
	{
		$this->m_oClass = $oClass;
		$this->m_oClassAlias = $oClassAlias;
		$this->m_oLeftField = $oExpression->GetLeftExpr();
		$this->m_oRightField = $oExpression->GetRightExpr();
	}

	public function GetClass()
	{
		return $this->m_oClass->GetValue();
	}
	public function GetClassAlias()
	{
		return $this->m_oClassAlias->GetValue();
	}

	public function GetClassDetails()
	{
		return $this->m_oClass;
	}
	public function GetClassAliasDetails()
	{
		return $this->m_oClassAlias;
	}

	public function GetLeftField()
	{
		return $this->m_oLeftField;
	}
	public function GetRightField()
	{
		return $this->m_oRightField;
	}
}

class BinaryOqlExpression extends BinaryExpression
{
}

class ScalarOqlExpression extends ScalarExpression
{
}

class FieldOqlExpression extends FieldExpression
{
	protected $m_oParent;
	protected $m_oName;

	public function __construct($oName, $oParent = null)
	{
		if (is_null($oParent))
		{
			$oParent = new OqlName('', 0);
		}
		$this->m_oParent = $oParent;
		$this->m_oName = $oName;

		parent::__construct($oName->GetValue(), $oParent->GetValue());
	}

	public function GetParentDetails()
	{
		return $this->m_oParent;
	}

	public function GetNameDetails()
	{
		return $this->m_oName;
	}
}

class ListOqlExpression extends ListExpression
{
}

class FunctionOqlExpression extends FunctionExpression
{
}

class IntervalOqlExpression extends IntervalExpression
{
}
class OqlQuery
{
	protected $m_oClass;
	protected $m_oClassAlias;
	protected $m_aJoins; // array of OqlJoinSpec
	protected $m_oCondition; // condition tree (expressions)

	public function __construct($oClass, $oClassAlias = '', $oCondition = null, $aJoins = null)
	{
		$this->m_oClass = $oClass;
		$this->m_oClassAlias = $oClassAlias;
		$this->m_aJoins = $aJoins;
		$this->m_oCondition = $oCondition;
	}

	public function GetClass()
	{
		return $this->m_oClass->GetValue();
	}
	public function GetClassAlias()
	{
		return $this->m_oClassAlias->GetValue();
	}

	public function GetClassDetails()
	{
		return $this->m_oClass;
	}
	public function GetClassAliasDetails()
	{
		return $this->m_oClassAlias;
	}

	public function GetJoins()
	{
		return $this->m_aJoins;
	}
	public function GetCondition()
	{
		return $this->m_oCondition;
	}
}

?>