<?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.doctrine-project.org>.
 */

namespace Doctrine\ORM\Query\AST;

/**
 * ComparisonExpression ::= ArithmeticExpression ComparisonOperator ( QuantifiedExpression | ArithmeticExpression ) |
 *                          StringExpression ComparisonOperator (StringExpression | QuantifiedExpression) |
 *                          BooleanExpression ("=" | "<>" | "!=") (BooleanExpression | QuantifiedExpression) |
 *                          EnumExpression ("=" | "<>" | "!=") (EnumExpression | QuantifiedExpression) |
 *                          DatetimeExpression ComparisonOperator (DatetimeExpression | QuantifiedExpression) |
 *                          EntityExpression ("=" | "<>") (EntityExpression | QuantifiedExpression)
 *
 * @author robo
 */
class ComparisonExpression extends Node
{
    private $_leftExpr;
    private $_rightExpr;
    private $_operator;

    public function __construct($leftExpr, $operator, $rightExpr)
    {
        $this->_leftExpr = $leftExpr;
        $this->_rightExpr = $rightExpr;
        $this->_operator = $operator;
    }

    public function getLeftExpression()
    {
        return $this->_leftExpr;
    }

    public function getRightExpression()
    {
        return $this->_rightExpr;
    }

    public function getOperator()
    {
        return $this->_operator;
    }

    public function dispatch($sqlWalker)
    {
        return $sqlWalker->walkComparisonExpression($this);
    }
}