/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jms.selector;
import javax.jms.InvalidSelectorException;
import javax.jms.JMSException;
import javax.jms.Message;
/**
* The base selector.
*/
public class OrSelector extends Selector {
private Selector _left;
private Selector _right;
OrSelector(Selector left, Selector right)
throws JMSException
{
_left = left;
_right = right;
if (! _left.isUnknown() && ! _left.isBoolean())
throw new InvalidSelectorException(L.l("'{0}' must have a numeric value for comparison.",
this));
if (! _right.isUnknown() && ! _right.isBoolean())
throw new InvalidSelectorException(L.l("'{0}' must have a numeric value for comparison.",
this));
}
/**
* Returns true since the value is a boolean.
*/
boolean isBoolean()
{
return true;
}
/**
* Returns false, since the type is known.
*/
boolean isUnknown()
{
return false;
}
/**
* Evaluate the message. The boolean literal selector returns
* the value of the boolean.
*/
public Object evaluate(Message message)
throws JMSException
{
Object lvalue = _left.evaluate(message);
if ((lvalue instanceof Boolean) && ((Boolean) lvalue).booleanValue())
return Boolean.TRUE;
Object rvalue = _right.evaluate(message);
if (rvalue == null)
return NULL;
if ((rvalue instanceof Boolean) && ((Boolean) rvalue).booleanValue())
return Boolean.TRUE;
else if (lvalue instanceof Boolean || rvalue instanceof Boolean)
return Boolean.FALSE;
else
return NULL;
}
public String toString()
{
return _left + " OR " + _right;
}
}