/*
* 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.ArithmeticExpression;
import net.timewalker.ffmq3.common.message.selector.expression.ConditionalExpression;
import net.timewalker.ffmq3.common.message.selector.expression.SelectorNode;
import net.timewalker.ffmq3.common.message.selector.expression.utils.ArithmeticUtils;
/**
* BetweenOperator
*/
public class BetweenOperator extends SelectorNode implements ConditionalExpression
{
protected SelectorNode leftOperand;
protected SelectorNode lowerBoundOperand;
protected SelectorNode upperBoundOperand;
/**
* Constructor
*/
public BetweenOperator( SelectorNode leftOperand,
SelectorNode lowerBoundOperand,
SelectorNode upperBoundOperand ) throws InvalidSelectorException
{
super();
this.leftOperand = leftOperand;
this.lowerBoundOperand = lowerBoundOperand;
this.upperBoundOperand = upperBoundOperand;
if (!(leftOperand instanceof ArithmeticExpression))
throw new InvalidSelectorException("left operand of BETWEEN operator must be an arithmetic expression");
if (!(lowerBoundOperand instanceof ArithmeticExpression))
throw new InvalidSelectorException("lower bound of BETWEEN operator must be an arithmetic expression");
if (!(upperBoundOperand instanceof ArithmeticExpression))
throw new InvalidSelectorException("upper bound of BETWEEN operator must be an arithmetic expression");
}
/*
* (non-Javadoc)
* @see net.timewalker.ffmq3.common.message.selector.expression.SelectorNode#evaluate(javax.jms.Message)
*/
public Object evaluate(Message message) throws JMSException
{
Number value = leftOperand.evaluateNumeric(message);
Number lowerBound = lowerBoundOperand.evaluateNumeric(message);
Number upperBound = upperBoundOperand.evaluateNumeric(message);
if (value == null || lowerBound == null || upperBound == null)
return null;
return ArithmeticUtils.greaterThanOrEquals(value, lowerBound).booleanValue() &&
ArithmeticUtils.lessThanOrEquals(value, upperBound).booleanValue() ?
Boolean.TRUE : Boolean.FALSE;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
public String toString()
{
return parenthesize(leftOperand)+" BETWEEN "+parenthesize(lowerBoundOperand)+" AND "+parenthesize(upperBoundOperand);
}
}