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.Collections; 021 import java.util.Iterator; 022 import java.util.List; 023 import java.util.concurrent.ThreadPoolExecutor; 024 025 import org.apache.camel.Exchange; 026 import org.apache.camel.Expression; 027 import org.apache.camel.Message; 028 import org.apache.camel.Processor; 029 import org.apache.camel.converter.ObjectConverter; 030 import org.apache.camel.processor.aggregate.AggregationStrategy; 031 import org.apache.camel.util.CollectionHelper; 032 033 import static org.apache.camel.util.ObjectHelper.notNull; 034 /** 035 * Implements a dynamic <a 036 * href="http://activemq.apache.org/camel/splitter.html">Splitter</a> pattern 037 * where an expression is evaluated to iterate through each of the parts of a 038 * message and then each part is then send to some endpoint. 039 * 040 * @version $Revision: 37863 $ 041 */ 042 public class Splitter extends MulticastProcessor implements Processor { 043 public static final String SPLIT_SIZE = "org.apache.camel.splitSize"; 044 public static final String SPLIT_COUNTER = "org.apache.camel.splitCounter"; 045 046 private final Expression expression; 047 048 public Splitter(Expression expression, Processor destination, AggregationStrategy aggregationStrategy) { 049 this(expression, destination, aggregationStrategy, false, null); 050 } 051 052 public Splitter(Expression expression, Processor destination, 053 AggregationStrategy aggregationStrategy, 054 boolean parallelProcessing, ThreadPoolExecutor threadPoolExecutor) { 055 super(Collections.singleton(destination), aggregationStrategy, parallelProcessing, threadPoolExecutor); 056 057 this.expression = expression; 058 notNull(expression, "expression"); 059 notNull(destination, "destination"); 060 } 061 062 @Override 063 public String toString() { 064 return "Splitter[on: " + expression + " to: " + getProcessors().iterator().next() + " aggregate: " + getAggregationStrategy() + "]"; 065 } 066 067 @Override 068 protected List<ProcessorExchangePair> createProcessorExchangePairs( 069 Exchange exchange) { 070 Object value = expression.evaluate(exchange); 071 Integer collectionSize = CollectionHelper.size(value); 072 List<ProcessorExchangePair> result; 073 if (collectionSize != null) { 074 result = new ArrayList<ProcessorExchangePair>(collectionSize); 075 } else { 076 result = new ArrayList<ProcessorExchangePair>(); 077 } 078 Iterator<Object> iter = ObjectConverter.iterator(value); 079 while (iter.hasNext()) { 080 Object part = iter.next(); 081 Exchange newExchange = exchange.copy(); 082 Message in = newExchange.getIn(); 083 in.setBody(part); 084 result.add(new ProcessorExchangePair(getProcessors().iterator().next(), newExchange)); 085 } 086 return result; 087 } 088 089 @Override 090 protected void updateNewExchange(Exchange exchange, int i, List<ProcessorExchangePair> allPairs) { 091 exchange.getIn().setHeader(SPLIT_COUNTER, i); 092 exchange.getIn().setHeader(SPLIT_SIZE, allPairs.size()); 093 } 094 }