<?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>.
 */

/**
 * ConditionalExpression = ConditionalTerm {"OR" ConditionalTerm}
 *
 * @package     Doctrine
 * @subpackage  Query
 * @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_Query_Production_ConditionalExpression extends Doctrine_Query_Production
{
    protected $_conditionalTerms = array();


    public function syntax($paramHolder)
    {
        // ConditionalExpression = ConditionalTerm {"OR" ConditionalTerm}
        $this->_conditionalTerms[] = $this->AST('ConditionalTerm', $paramHolder);

        while ($this->_isNextToken(Doctrine_Query_Token::T_OR)) {
            $this->_parser->match(Doctrine_Query_Token::T_OR);
            $this->_conditionalTerms[] = $this->AST('ConditionalTerm', $paramHolder);
        }

        // Optimize depth instances in AST
        if (count($this->_conditionalTerms) == 1) {
            return $this->_conditionalTerms[0];
        }
    }


    public function buildSql()
    {
        return implode(' OR ', $this->_mapConditionalTerms());
    }


    protected function _mapConditionalTerms()
    {
        return array_map(array(&$this, '_mapConditionalTerm'), $this->_conditionalTerms);
    }


    protected function _mapConditionalTerm($value)
    {
        return $value->buildSql();
    }
    
    /**
     * Visitor support.
     *
     * @param object $visitor
     */
    public function accept($visitor)
    {
        foreach ($this->_conditionalTerms as $term) {
            $term->accept($visitor);
        }
        $visitor->visitConditionalExpression($this);
    }
    
    /* Getters */
    
    public function getConditionalTerms()
    {
        return $this->_conditionalTerms;
    }
}