<?php

/*

 * 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.doctrine-project.org>.

 */

namespace Doctrine\ORM\Query\AST;

/**

 * AssociationPathExpression ::= CollectionValuedPathExpression | SingleValuedAssociationPathExpression

 * SingleValuedPathExpression ::= StateFieldPathExpression | SingleValuedAssociationPathExpression

 * StateFieldPathExpression ::= SimpleStateFieldPathExpression | SimpleStateFieldAssociationPathExpression

 * SingleValuedAssociationPathExpression ::= IdentificationVariable "." SingleValuedAssociationField

 * CollectionValuedPathExpression ::= IdentificationVariable "." CollectionValuedAssociationField

 * StateField ::= {EmbeddedClassStateField "."}* SimpleStateField

 * SimpleStateFieldPathExpression ::= IdentificationVariable "." StateField

 * 

 * @since   2.0

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

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

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

 */

class PathExpression extends Node

{

    const TYPE_COLLECTION_VALUED_ASSOCIATION = 2;

    const TYPE_SINGLE_VALUED_ASSOCIATION = 4;

    const TYPE_STATE_FIELD = 8;

    public $type;

    public $expectedType;

    public $identificationVariable;

    public $field;

    public function __construct($expectedType, $identificationVariable, $field = null)

    {

        $this->expectedType = $expectedType;

        $this->identificationVariable = $identificationVariable;

        $this->field = $field;

    }

    public function dispatch($walker)

    {

        return $walker->walkPathExpression($this);

    }

}