/*
* This file is part of FFMQ.
*
* FFMQ is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FFMQ is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with FFMQ; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.timewalker.ffmq3.common.message.selector.expression.operator;
import javax.jms.InvalidSelectorException;
import javax.jms.JMSException;
import javax.jms.Message;
import net.timewalker.ffmq3.common.message.selector.expression.ConditionalExpression;
import net.timewalker.ffmq3.common.message.selector.expression.Identifier;
import net.timewalker.ffmq3.common.message.selector.expression.SelectorNode;
import net.timewalker.ffmq3.common.message.selector.expression.utils.StringUtils;
/**
* LikeOperator
*/
public class LikeOperator extends AbstractBinaryOperator implements ConditionalExpression
{
protected SelectorNode escapeOperand;
/**
* Constructor
*/
public LikeOperator( SelectorNode leftOperand , SelectorNode rightOperand , SelectorNode escapeOperand ) throws InvalidSelectorException
{
super(leftOperand,rightOperand);
this.escapeOperand = escapeOperand;
if (!(leftOperand instanceof Identifier))
throw new InvalidSelectorException("left operand of LIKE operator must be an identifier");
}
/*
* (non-Javadoc)
* @see net.timewalker.ffmq3.common.message.selector.expression.SelectorNode#evaluate(javax.jms.Message)
*/
public Object evaluate(Message message) throws JMSException
{
String leftValue = leftOperand.evaluateString(message);
String rightValue = rightOperand.evaluateString(message);
if (leftValue == null || rightValue == null)
return null;
String escapeValue = escapeOperand != null ? escapeOperand.evaluateString(message) : null;
return StringUtils.matches(leftValue, rightValue, escapeValue);
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
public String toString()
{
return parenthesize(leftOperand)+" LIKE "+parenthesize(rightOperand)+(escapeOperand != null ? " ESCAPE "+parenthesize(escapeOperand) : "");
}
}