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 static org.apache.camel.util.ObjectHelper.notNull; 020 021 import java.util.ArrayList; 022 import java.util.Collection; 023 import java.util.Collections; 024 import java.util.Iterator; 025 import java.util.List; 026 import java.util.concurrent.ThreadPoolExecutor; 027 028 import org.apache.camel.Exchange; 029 import org.apache.camel.Expression; 030 import org.apache.camel.Message; 031 import org.apache.camel.Processor; 032 import org.apache.camel.processor.aggregate.AggregationStrategy; 033 import org.apache.camel.util.CollectionHelper; 034 import org.apache.camel.util.ObjectHelper; 035 036 /** 037 * Implements a dynamic <a 038 * href="http://activemq.apache.org/camel/splitter.html">Splitter</a> pattern 039 * where an expression is evaluated to iterate through each of the parts of a 040 * message and then each part is then send to some endpoint. 041 * 042 * @version $Revision: 51106 $ 043 */ 044 public class Splitter extends MulticastProcessor implements Processor { 045 public static final String SPLIT_SIZE = "org.apache.camel.splitSize"; 046 public static final String SPLIT_COUNTER = "org.apache.camel.splitCounter"; 047 048 private final Expression expression; 049 private final boolean streaming; 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); 059 060 this.expression = expression; 061 this.streaming = streaming; 062 notNull(expression, "expression"); 063 notNull(destination, "destination"); 064 } 065 066 @Override 067 public String toString() { 068 return "Splitter[on: " + expression + " to: " + getProcessors().iterator().next() + " aggregate: " + getAggregationStrategy() + "]"; 069 } 070 071 @Override 072 protected Iterable<ProcessorExchangePair> createProcessorExchangePairs(Exchange exchange) { 073 Object value = expression.evaluate(exchange); 074 075 if (streaming) { 076 return createProcessorExchangePairsIterable(exchange, value); 077 } else { 078 return createProcessorExchangePairsList(exchange, value); 079 } 080 } 081 082 private Iterable<ProcessorExchangePair> createProcessorExchangePairsIterable(final Exchange exchange, Object value) { 083 final Iterator iterator = ObjectHelper.createIterator(value); 084 return new Iterable() { 085 086 public Iterator iterator() { 087 return new Iterator() { 088 089 public boolean hasNext() { 090 return iterator.hasNext(); 091 } 092 093 public Object next() { 094 Object part = iterator.next(); 095 Exchange newExchange = exchange.copy(); 096 Message in = newExchange.getIn(); 097 in.setBody(part); 098 return new ProcessorExchangePair(getProcessors().iterator().next(), newExchange); 099 } 100 101 public void remove() { 102 throw new UnsupportedOperationException("remove is not supported by this iterator"); 103 } 104 }; 105 } 106 107 }; 108 } 109 110 private Iterable<ProcessorExchangePair> createProcessorExchangePairsList(Exchange exchange, Object value) { 111 List<ProcessorExchangePair> result; 112 Integer collectionSize = CollectionHelper.size(value); 113 if (collectionSize != null) { 114 result = new ArrayList<ProcessorExchangePair>(collectionSize); 115 } else { 116 result = new ArrayList<ProcessorExchangePair>(); 117 } 118 Iterator<Object> iter = ObjectHelper.createIterator(value); 119 while (iter.hasNext()) { 120 Object part = iter.next(); 121 Exchange newExchange = exchange.copy(); 122 Message in = newExchange.getIn(); 123 in.setBody(part); 124 result.add(new ProcessorExchangePair(getProcessors().iterator().next(), newExchange)); 125 } 126 return result; 127 } 128 129 @Override 130 protected void updateNewExchange(Exchange exchange, int i, Iterable<ProcessorExchangePair> allPairs) { 131 exchange.getIn().setHeader(SPLIT_COUNTER, i); 132 if (allPairs instanceof Collection) { 133 exchange.getIn().setHeader(SPLIT_SIZE, ((Collection) allPairs).size()); 134 } 135 } 136 }