/*
* 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 java.util.logging.Logger;
import javax.jms.JMSException;
import javax.jms.Message;
import com.caucho.jms.message.ObjectConverter;
import com.caucho.jms.queue.MessageException;
import com.caucho.jms.queue.QueueEntry;
import com.caucho.jms.queue.QueueEntrySelector;
import com.caucho.util.L10N;
/**
* The base selector.
*/
abstract public class Selector implements QueueEntrySelector {
protected static final Logger log
= Logger.getLogger(Selector.class.getName());
static final L10N L = new L10N(Selector.class);
protected final static Object NULL = new Object();
/**
* Evaluate the message.
*/
abstract Object evaluate(Message message)
throws JMSException;
public boolean isMatch(Message message)
throws JMSException
{
Object obj = evaluate(message);
if (! (obj instanceof Boolean))
return false;
Boolean bool = (Boolean) obj;
return bool.booleanValue();
}
@Override
public boolean isMatch(Object entry)
{
try {
QueueEntry queueEntry = (QueueEntry)entry;
return isMatch((Message)queueEntry.getPayload());
} catch (JMSException je) {
throw new MessageException(je);
}
}
protected static Boolean toBoolean(boolean value)
{
return value ? Boolean.TRUE : Boolean.FALSE;
}
boolean isBoolean()
{
return false;
}
boolean isUnknown()
{
return true;
}
boolean isNumber()
{
return false;
}
static boolean isDouble(Object obj)
{
return obj instanceof Double || obj instanceof Float;
}
static boolean isInteger(Object obj)
{
return (obj instanceof Integer ||
obj instanceof Long ||
obj instanceof Short ||
obj instanceof Byte);
}
static boolean isNumber(Object obj)
{
return (obj instanceof Number);
}
protected long toLong(Object obj)
throws JMSException
{
return ObjectConverter.toLong(obj);
}
protected double toDouble(Object obj)
throws JMSException
{
return ObjectConverter.toDouble(obj);
}
}