<?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>.
 */

/**
 * JoinAssociationPathExpression ::= JoinCollectionValuedPathExpression | JoinSingleValuedAssociationPathExpression
 *
 * @author      Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author      Janne Vanhala <jpvanhal@cc.hut.fi>
 * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @link        http://www.phpdoctrine.org
 * @since       2.0
 * @version     $Revision$
 */
class Doctrine_ORM_Query_Parser_JoinAssociationPathExpression extends Doctrine_ORM_Query_ParserRule
{
    public function syntax()
    {
        // JoinAssociationPathExpression ::= JoinCollectionValuedPathExpression | JoinSingleValuedAssociationPathExpression
        return $this->parse($this->_isSingleValuedPathExpression() 
            ? 'JoinSingleValuedAssociationPathExpression'
            : 'JoinCollectionValuedPathExpression'
        );
    }


    private function _isSingleValuedPathExpression()
    {
        $parserResult = $this->_parser->getParserResult();

        // Trying to recoginize this grammar: 
        // IdentificationVariable "." (CollectionValuedAssociationField | SingleValuedAssociationField)
        $token = $this->_parser->lookahead;
        $this->_parser->getScanner()->resetPeek();

        if ($parserResult->hasQueryComponent($token['value'])) {
            $queryComponent = $parserResult->getQueryComponent($token['value']);
            $token = $this->_parser->getScanner()->peek();

            // If we have a dot ".", then next char must be the "*"
            if ($token['type'] === Doctrine_ORM_Query_Token::T_DOT) {
                $token = $this->_parser->getScanner()->peek();

                if ( ! ($queryComponent['metadata']->hasAssociation($token['value']) &&
	                $queryComponent['metadata']->getAssociation($token['value'])->isOneToTone())) {
	                return true;
	            }
            }
        }

        return false;
    }
}