001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: * Free SoftwareFoundation, Inc.
023: * 59 Temple Place, Suite 330
024: * Boston, MA 02111-1307 USA
025: *
026: * @author Scott Ferguson
027: */
028:
029: package com.caucho.jms.selector;
030:
031: import com.caucho.jms.message.ObjectConverter;
032: import com.caucho.log.Log;
033: import com.caucho.util.L10N;
034:
035: import javax.jms.JMSException;
036: import javax.jms.Message;
037: import java.util.logging.Logger;
038:
039: /**
040: * The base selector.
041: */
042: abstract public class Selector {
043: protected static final Logger log = Log.open(Selector.class);
044: static final L10N L = new L10N(Selector.class);
045:
046: protected final static Object NULL = new Object();
047:
048: /**
049: * Evaluate the message.
050: */
051: abstract Object evaluate(Message message) throws JMSException;
052:
053: public boolean isMatch(Message message) throws JMSException {
054: Object obj = evaluate(message);
055:
056: if (!(obj instanceof Boolean))
057: return false;
058:
059: Boolean bool = (Boolean) obj;
060:
061: return bool.booleanValue();
062: }
063:
064: protected static Boolean toBoolean(boolean value) {
065: return value ? Boolean.TRUE : Boolean.FALSE;
066: }
067:
068: boolean isBoolean() {
069: return false;
070: }
071:
072: boolean isUnknown() {
073: return true;
074: }
075:
076: boolean isNumber() {
077: return false;
078: }
079:
080: static boolean isDouble(Object obj) {
081: return obj instanceof Double || obj instanceof Float;
082: }
083:
084: static boolean isInteger(Object obj) {
085: return (obj instanceof Integer || obj instanceof Long
086: || obj instanceof Short || obj instanceof Byte);
087: }
088:
089: static boolean isNumber(Object obj) {
090: return (obj instanceof Number);
091: }
092:
093: protected long toLong(Object obj) throws JMSException {
094: return ObjectConverter.toLong(obj);
095: }
096:
097: protected double toDouble(Object obj) throws JMSException {
098: return ObjectConverter.toDouble(obj);
099: }
100: }
|