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 static org.apache.camel.util.ObjectHelper.notNull; 021 022 import java.util.ArrayList; 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.converter.ObjectConverter; 033 import org.apache.camel.processor.aggregate.AggregationStrategy; 034 import org.apache.camel.util.CollectionHelper; 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: 643855 $ 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; 049 050 public Splitter(Expression expression, Processor destination, AggregationStrategy aggregationStrategy) { 051 this(expression, destination, aggregationStrategy, false, null); 052 } 053 054 public Splitter(Expression expression, Processor destination, 055 AggregationStrategy aggregationStrategy, 056 boolean parallelProcessing, ThreadPoolExecutor threadPoolExecutor) { 057 super(Collections.singleton(destination), aggregationStrategy, parallelProcessing, threadPoolExecutor); 058 059 this.expression = expression; 060 notNull(expression, "expression"); 061 notNull(destination, "destination"); 062 } 063 064 @Override 065 public String toString() { 066 return "Splitter[on: " + expression + " to: " + getProcessors().iterator().next() + " aggregate: " + getAggregationStrategy() + "]"; 067 } 068 069 @Override 070 protected List<ProcessorExchangePair> createProcessorExchangePairs( 071 Exchange exchange) { 072 Object value = expression.evaluate(exchange); 073 Integer collectionSize = CollectionHelper.size(value); 074 List<ProcessorExchangePair> result; 075 if (collectionSize != null) { 076 result = new ArrayList<ProcessorExchangePair>(collectionSize); 077 } else { 078 result = new ArrayList<ProcessorExchangePair>(); 079 } 080 for (Iterator<Object> iter = ObjectConverter.iterator(value); iter.hasNext(); ) { 081 Object part = iter.next(); 082 Exchange newExchange = exchange.copy(); 083 Message in = newExchange.getIn(); 084 in.setBody(part); 085 result.add(new ProcessorExchangePair(getProcessors().iterator().next(), newExchange)); 086 } 087 return result; 088 } 089 090 @Override 091 protected void updateNewExchange(Exchange exchange, int i, List<ProcessorExchangePair> allPairs) { 092 exchange.getIn().setHeader(SPLIT_COUNTER, i); 093 exchange.getIn().setHeader(SPLIT_SIZE, allPairs.size()); 094 } 095 }