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.Collections; 022 import java.util.Iterator; 023 import java.util.List; 024 import java.util.concurrent.ExecutorService; 025 026 import org.apache.camel.Exchange; 027 import org.apache.camel.Expression; 028 import org.apache.camel.Message; 029 import org.apache.camel.Processor; 030 import org.apache.camel.processor.aggregate.AggregationStrategy; 031 import org.apache.camel.util.CollectionHelper; 032 import org.apache.camel.util.ObjectHelper; 033 034 import static org.apache.camel.util.ObjectHelper.notNull; 035 036 /** 037 * Implements a dynamic <a 038 * href="http://camel.apache.org/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: 788621 $ 043 */ 044 public class Splitter extends MulticastProcessor implements Processor, Traceable { 045 private final Expression expression; 046 047 public Splitter(Expression expression, Processor destination, AggregationStrategy aggregationStrategy) { 048 this(expression, destination, aggregationStrategy, false, null, false); 049 } 050 051 public Splitter(Expression expression, Processor destination, AggregationStrategy aggregationStrategy, 052 boolean parallelProcessing, ExecutorService executorService, boolean streaming) { 053 super(Collections.singleton(destination), aggregationStrategy, parallelProcessing, executorService, streaming); 054 055 this.expression = expression; 056 notNull(expression, "expression"); 057 notNull(destination, "destination"); 058 } 059 060 @Override 061 public String toString() { 062 return "Splitter[on: " + expression + " to: " + getProcessors().iterator().next() + " aggregate: " + getAggregationStrategy() + "]"; 063 } 064 065 @Override 066 public String getTraceLabel() { 067 return "Split[" + expression + "]"; 068 } 069 070 @Override 071 protected Iterable<ProcessorExchangePair> createProcessorExchangePairs(Exchange exchange) { 072 Object value = expression.evaluate(exchange, Object.class); 073 074 if (isStreaming()) { 075 return createProcessorExchangePairsIterable(exchange, value); 076 } else { 077 return createProcessorExchangePairsList(exchange, value); 078 } 079 } 080 081 @SuppressWarnings("unchecked") 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 if (part instanceof Message) { 097 newExchange.setIn((Message)part); 098 } else { 099 Message in = newExchange.getIn(); 100 in.setBody(part); 101 } 102 return new ProcessorExchangePair(getProcessors().iterator().next(), newExchange); 103 } 104 105 public void remove() { 106 throw new UnsupportedOperationException("Remove is not supported by this iterator"); 107 } 108 }; 109 } 110 111 }; 112 } 113 114 private Iterable<ProcessorExchangePair> createProcessorExchangePairsList(Exchange exchange, Object value) { 115 List<ProcessorExchangePair> result; 116 Integer collectionSize = CollectionHelper.size(value); 117 if (collectionSize != null) { 118 result = new ArrayList<ProcessorExchangePair>(collectionSize); 119 } else { 120 result = new ArrayList<ProcessorExchangePair>(); 121 } 122 Iterator iter = ObjectHelper.createIterator(value); 123 while (iter.hasNext()) { 124 Object part = iter.next(); 125 Exchange newExchange = exchange.copy(); 126 if (part instanceof Message) { 127 newExchange.setIn((Message)part); 128 } else { 129 Message in = newExchange.getIn(); 130 in.setBody(part); 131 } 132 result.add(new ProcessorExchangePair(getProcessors().iterator().next(), newExchange)); 133 } 134 return result; 135 } 136 137 @Override 138 protected void updateNewExchange(Exchange exchange, int index, Iterable<ProcessorExchangePair> allPairs) { 139 super.updateNewExchange(exchange, index, allPairs); 140 exchange.setProperty(Exchange.SPLIT_INDEX, index); 141 if (allPairs instanceof Collection) { 142 exchange.setProperty(Exchange.SPLIT_SIZE, ((Collection) allPairs).size()); 143 } 144 } 145 146 public Expression getExpression() { 147 return expression; 148 } 149 }