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.Collection;
021 import java.util.List;
022
023 import org.apache.camel.Exchange;
024 import org.apache.camel.Navigate;
025 import org.apache.camel.Processor;
026 import org.apache.camel.impl.ServiceSupport;
027 import org.apache.camel.util.ServiceHelper;
028
029 /**
030 * Represents a composite pattern, aggregating a collection of processors
031 * together as a single processor
032 *
033 * @version $Revision: 769303 $
034 */
035 public class CompositeProcessor extends ServiceSupport implements Processor, Navigate<Processor> {
036 private final Collection<Processor> processors;
037
038 public CompositeProcessor(Collection<Processor> processors) {
039 this.processors = processors;
040 }
041
042 public void process(Exchange exchange) throws Exception {
043 for (Processor processor : processors) {
044 processor.process(exchange);
045 }
046 }
047
048 @Override
049 public String toString() {
050 StringBuilder builder = new StringBuilder("[ ");
051 boolean first = true;
052 for (Processor processor : processors) {
053 if (first) {
054 first = false;
055 } else {
056 builder.append(", ");
057 }
058 builder.append(processor.toString());
059 }
060 builder.append(" ]");
061 return builder.toString();
062 }
063
064 public Collection<Processor> getProcessors() {
065 return processors;
066 }
067
068 public List<Processor> next() {
069 if (!hasNext()) {
070 return null;
071 }
072 return new ArrayList<Processor>(processors);
073 }
074
075 public boolean hasNext() {
076 return processors != null && !processors.isEmpty();
077 }
078
079 protected void doStart() throws Exception {
080 ServiceHelper.startServices(processors);
081 }
082
083 protected void doStop() throws Exception {
084 ServiceHelper.stopServices(processors);
085 }
086 }