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: 1235 $ 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 Message in = newExchange.getIn(); 096 in.setBody(part); 097 return new ProcessorExchangePair(getProcessors().iterator().next(), newExchange); 098 } 099 100 public void remove() { 101 throw new UnsupportedOperationException("remove is not supported by this iterator"); 102 } 103 }; 104 } 105 106 }; 107 } 108 109 private Iterable<ProcessorExchangePair> createProcessorExchangePairsList(Exchange exchange, Object value) { 110 List<ProcessorExchangePair> result; 111 Integer collectionSize = CollectionHelper.size(value); 112 if (collectionSize != null) { 113 result = new ArrayList<ProcessorExchangePair>(collectionSize); 114 } else { 115 result = new ArrayList<ProcessorExchangePair>(); 116 } 117 Iterator<Object> iter = ObjectHelper.createIterator(value); 118 while (iter.hasNext()) { 119 Object part = iter.next(); 120 Exchange newExchange = exchange.copy(); 121 Message in = newExchange.getIn(); 122 in.setBody(part); 123 result.add(new ProcessorExchangePair(getProcessors().iterator().next(), newExchange)); 124 } 125 return result; 126 } 127 128 @Override 129 protected void updateNewExchange(Exchange exchange, int i, Iterable<ProcessorExchangePair> allPairs) { 130 exchange.getIn().setHeader(SPLIT_COUNTER, i); 131 if (allPairs instanceof Collection) { 132 exchange.getIn().setHeader(SPLIT_SIZE, ((Collection) allPairs).size()); 133 } 134 } 135 }