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 package org.apache.camel.processor; 018 019 import java.util.ArrayList; 020 import java.util.List; 021 022 import org.apache.camel.Exchange; 023 import org.apache.camel.Predicate; 024 import org.apache.camel.Processor; 025 import org.apache.camel.impl.ServiceSupport; 026 import org.apache.camel.util.ServiceHelper; 027 028 /** 029 * Implements a Choice structure where one or more predicates are used which if 030 * they are true their processors are used, with a default otherwise clause used 031 * if none match. 032 * 033 * @version $Revision: 35332 $ 034 */ 035 public class ChoiceProcessor extends ServiceSupport implements Processor { 036 private List<FilterProcessor> filters = new ArrayList<FilterProcessor>(); 037 private Processor otherwise; 038 039 public ChoiceProcessor(List<FilterProcessor> filters, Processor otherwise) { 040 this.filters = filters; 041 this.otherwise = otherwise; 042 } 043 044 public void process(Exchange exchange) throws Exception { 045 for (FilterProcessor filterProcessor : filters) { 046 Predicate<Exchange> predicate = filterProcessor.getPredicate(); 047 if (predicate != null && predicate.matches(exchange)) { 048 filterProcessor.getProcessor().process(exchange); 049 return; 050 } 051 } 052 if (otherwise != null) { 053 otherwise.process(exchange); 054 } 055 } 056 057 @Override 058 public String toString() { 059 StringBuilder builder = new StringBuilder("choice{"); 060 boolean first = true; 061 for (FilterProcessor processor : filters) { 062 if (first) { 063 first = false; 064 } else { 065 builder.append(", "); 066 } 067 builder.append("when "); 068 builder.append(processor.getPredicate().toString()); 069 builder.append(": "); 070 builder.append(processor.getProcessor()); 071 } 072 if (otherwise != null) { 073 builder.append(", otherwise: "); 074 builder.append(otherwise); 075 } 076 builder.append("}"); 077 return builder.toString(); 078 } 079 080 public List<FilterProcessor> getFilters() { 081 return filters; 082 } 083 084 public Processor getOtherwise() { 085 return otherwise; 086 } 087 088 protected void doStart() throws Exception { 089 ServiceHelper.startServices(filters); 090 ServiceHelper.startServices(otherwise); 091 } 092 093 protected void doStop() throws Exception { 094 ServiceHelper.stopServices(otherwise); 095 ServiceHelper.stopServices(filters); 096 } 097 }