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
020 import java.util.ArrayList;
021 import java.util.Collection;
022 import java.util.Collections;
023 import java.util.Iterator;
024 import java.util.List;
025 import java.util.concurrent.ThreadPoolExecutor;
026
027 import org.apache.camel.Exchange;
028 import org.apache.camel.Expression;
029 import org.apache.camel.Message;
030 import org.apache.camel.Processor;
031 import org.apache.camel.processor.aggregate.AggregationStrategy;
032 import org.apache.camel.util.CollectionHelper;
033 import org.apache.camel.util.ObjectHelper;
034
035 import static org.apache.camel.util.ObjectHelper.notNull;
036
037 /**
038 * Implements a dynamic <a
039 * href="http://activemq.apache.org/camel/splitter.html">Splitter</a> pattern
040 * where an expression is evaluated to iterate through each of the parts of a
041 * message and then each part is then send to some endpoint.
042 *
043 * @version $Revision: 773447 $
044 */
045 public class Splitter extends MulticastProcessor implements Processor {
046 public static final String SPLIT_SIZE = "org.apache.camel.splitSize";
047 public static final String SPLIT_COUNTER = "org.apache.camel.splitCounter";
048
049 private final Expression expression;
050
051 public Splitter(Expression expression, Processor destination, AggregationStrategy aggregationStrategy) {
052 this(expression, destination, aggregationStrategy, false, null, false);
053 }
054
055 public Splitter(Expression expression, Processor destination,
056 AggregationStrategy aggregationStrategy,
057 boolean parallelProcessing, ThreadPoolExecutor threadPoolExecutor, boolean streaming) {
058 super(Collections.singleton(destination), aggregationStrategy, parallelProcessing, threadPoolExecutor, streaming);
059
060 this.expression = expression;
061 notNull(expression, "expression");
062 notNull(destination, "destination");
063 }
064
065 @Override
066 public String toString() {
067 return "Splitter[on: " + expression + " to: " + getProcessors().iterator().next() + " aggregate: " + getAggregationStrategy() + "]";
068 }
069
070 @Override
071 protected Iterable<ProcessorExchangePair> createProcessorExchangePairs(Exchange exchange) {
072 Object value = expression.evaluate(exchange);
073
074 if (isStreaming()) {
075 return createProcessorExchangePairsIterable(exchange, value);
076 } else {
077 return createProcessorExchangePairsList(exchange, value);
078 }
079 }
080
081 private Iterable<ProcessorExchangePair> createProcessorExchangePairsIterable(final Exchange exchange, Object value) {
082 final Iterator iterator = ObjectHelper.createIterator(value);
083 return new Iterable() {
084
085 public Iterator iterator() {
086 return new Iterator() {
087
088 public boolean hasNext() {
089 return iterator.hasNext();
090 }
091
092 public Object next() {
093 Object part = iterator.next();
094 Exchange newExchange = exchange.copy();
095 if (part instanceof Message) {
096 newExchange.setIn((Message)part);
097 } else {
098 Message in = newExchange.getIn();
099 in.setBody(part);
100 }
101 return new ProcessorExchangePair(getProcessors().iterator().next(), newExchange);
102 }
103
104 public void remove() {
105 throw new UnsupportedOperationException("remove is not supported by this iterator");
106 }
107 };
108 }
109
110 };
111 }
112
113 private Iterable<ProcessorExchangePair> createProcessorExchangePairsList(Exchange exchange, Object value) {
114 List<ProcessorExchangePair> result;
115 Integer collectionSize = CollectionHelper.size(value);
116 if (collectionSize != null) {
117 result = new ArrayList<ProcessorExchangePair>(collectionSize);
118 } else {
119 result = new ArrayList<ProcessorExchangePair>();
120 }
121 Iterator<Object> iter = ObjectHelper.createIterator(value);
122 while (iter.hasNext()) {
123 Object part = iter.next();
124 Exchange newExchange = exchange.copy();
125 if (part instanceof Message) {
126 newExchange.setIn((Message)part);
127 } else {
128 Message in = newExchange.getIn();
129 in.setBody(part);
130 }
131 result.add(new ProcessorExchangePair(getProcessors().iterator().next(), newExchange));
132 }
133 return result;
134 }
135
136 @Override
137 protected void updateNewExchange(Exchange exchange, int i, Iterable<ProcessorExchangePair> allPairs) {
138 exchange.getIn().setHeader(SPLIT_COUNTER, i);
139 if (allPairs instanceof Collection) {
140 exchange.getIn().setHeader(SPLIT_SIZE, ((Collection) allPairs).size());
141 }
142 }
143 }