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.Iterator;
020    
021    import org.apache.camel.Exchange;
022    import org.apache.camel.Expression;
023    import org.apache.camel.Processor;
024    import org.apache.camel.converter.ObjectConverter;
025    import org.apache.camel.impl.ServiceSupport;
026    import org.apache.camel.util.ServiceHelper;
027    
028    import static org.apache.camel.util.ObjectHelper.notNull;
029    
030    /**
031     * Implements a dynamic <a
032     * href="http://activemq.apache.org/camel/splitter.html">Splitter</a> pattern
033     * where an expression is evaluated to iterate through each of the parts of a
034     * message and then each part is then send to some endpoint.
035     * 
036     * @version $Revision: 563607 $
037     */
038    public class Splitter extends ServiceSupport implements Processor {
039        private final Processor processor;
040        private final Expression expression;
041    
042        public Splitter(Expression expression, Processor destination) {
043            this.processor = destination;
044            this.expression = expression;
045            notNull(destination, "destination");
046            notNull(expression, "expression");
047        }
048    
049        @Override
050        public String toString() {
051            return "Splitter[on: " + expression + " to: " + processor + "]";
052        }
053    
054        public void process(Exchange exchange) throws Exception {
055            Object value = expression.evaluate(exchange);
056            Iterator iter = ObjectConverter.iterator(value);
057            while (iter.hasNext()) {
058                Object part = iter.next();
059                Exchange newExchange = exchange.copy();
060                newExchange.getIn().setBody(part);
061                processor.process(newExchange);
062            }
063        }
064    
065        protected void doStart() throws Exception {
066            ServiceHelper.startServices(processor);
067        }
068    
069        protected void doStop() throws Exception {
070            ServiceHelper.stopServices(processor);
071        }
072    }