001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     * http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.camel.processor;
019    
020    import org.apache.camel.Exchange;
021    import org.apache.camel.Expression;
022    import org.apache.camel.Processor;
023    import org.apache.camel.converter.ObjectConverter;
024    import org.apache.camel.impl.ServiceSupport;
025    import static org.apache.camel.util.ObjectHelper.notNull;
026    import org.apache.camel.util.ServiceHelper;
027    
028    import java.util.Iterator;
029    
030    /**
031     * Implements a dynamic <a href="http://activemq.apache.org/camel/splitter.html">Splitter</a> pattern
032     * where an expression is evaluated to iterate through each of the parts of a message and then each part is then send to some endpoint.
033     *
034     * @version $Revision: 534145 $
035     */
036    public class Splitter extends ServiceSupport implements Processor {
037        private final Processor processor;
038        private final Expression expression;
039    
040        public Splitter(Processor destination, Expression expression) {
041            this.processor = destination;
042            this.expression = expression;
043            notNull(destination, "destination");
044            notNull(expression, "expression");
045        }
046    
047        @Override
048        public String toString() {
049            return "Splitter[on: " + expression + " to: " + processor + "]";
050        }
051    
052        public void process(Exchange exchange) throws Exception {
053            Object value = expression.evaluate(exchange);
054            Iterator iter = ObjectConverter.iterator(value);
055            while (iter.hasNext()) {
056                Object part = iter.next();
057                Exchange newExchange = exchange.copy();
058                newExchange.getIn().setBody(part);
059                processor.process(newExchange);
060            }
061        }
062    
063        protected void doStart() throws Exception {
064            ServiceHelper.startServices(processor);
065        }
066    
067        protected void doStop() throws Exception {
068            ServiceHelper.stopServices(processor);
069        }
070    }