001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.activemq.filter; 019 020import java.io.IOException; 021 022import javax.jms.JMSException; 023import org.apache.activemq.command.ActiveMQDestination; 024import org.apache.activemq.util.JMSExceptionSupport; 025 026/** 027 * Represents a filter which only operates on Destinations 028 */ 029public abstract class DestinationFilter implements BooleanExpression { 030 031 public static final String ANY_DESCENDENT = ">"; 032 public static final String ANY_CHILD = "*"; 033 034 public Object evaluate(MessageEvaluationContext message) throws JMSException { 035 return matches(message) ? Boolean.TRUE : Boolean.FALSE; 036 } 037 038 public boolean matches(MessageEvaluationContext message) throws JMSException { 039 try { 040 if (message.isDropped()) { 041 return false; 042 } 043 return matches(message.getMessage().getDestination()); 044 } catch (IOException e) { 045 throw JMSExceptionSupport.create(e); 046 } 047 } 048 049 public abstract boolean matches(ActiveMQDestination destination); 050 051 public static DestinationFilter parseFilter(ActiveMQDestination destination) { 052 if (destination.isComposite()) { 053 return new CompositeDestinationFilter(destination); 054 } 055 String[] paths = DestinationPath.getDestinationPaths(destination); 056 int idx = paths.length - 1; 057 if (idx >= 0) { 058 String lastPath = paths[idx]; 059 if (lastPath.equals(ANY_DESCENDENT)) { 060 return new PrefixDestinationFilter(paths, destination.getDestinationType()); 061 } else { 062 while (idx >= 0) { 063 lastPath = paths[idx--]; 064 if (lastPath.equals(ANY_CHILD)) { 065 return new WildcardDestinationFilter(paths, destination.getDestinationType()); 066 } 067 } 068 } 069 } 070 071 // if none of the paths contain a wildcard then use equality 072 return new SimpleDestinationFilter(destination); 073 } 074 075 public abstract boolean isWildcard(); 076}