<?php

/*

 *  $Id$

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * This software consists of voluntary contributions made by many individuals

 * and is licensed under the LGPL. For more information, see

 * <http://www.phpdoctrine.org>.

 */

namespace Doctrine\ORM\Query\AST;

/**

 * Join ::= ["LEFT" ["OUTER"] | "INNER"] "JOIN" JoinAssociationPathExpression

 *          ["AS"] AliasIdentificationVariable [("ON" | "WITH") ConditionalExpression]

 *

 * @license http://www.opensource.org/licenses/lgpl-license.php LGPL

 * @link    www.doctrine-project.org

 * @since   2.0

 * @version $Revision: 3938 $

 * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>

 * @author  Jonathan Wage <jonwage@gmail.com>

 * @author  Roman Borschel <roman@code-factory.org>

 */

class Join extends Node

{

    const JOIN_TYPE_LEFT = 1;

    const JOIN_TYPE_LEFTOUTER = 2;

    const JOIN_TYPE_INNER = 3;

    public $joinType = self::JOIN_TYPE_INNER;    

    public $joinAssociationPathExpression = null;

    public $aliasIdentificationVariable = null;

    public $conditionalExpression = null;

    public function __construct($joinType, $joinAssocPathExpr, $aliasIdentVar)

    {

        $this->joinType = $joinType;

        $this->joinAssociationPathExpression = $joinAssocPathExpr;

        $this->aliasIdentificationVariable = $aliasIdentVar;

    }

    public function dispatch($sqlWalker)

    {

        return $sqlWalker->walkJoin($this);

    }

}