| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.camel.processor; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Navigate; |
| import org.apache.camel.Processor; |
| import org.apache.camel.impl.ServiceSupport; |
| import org.apache.camel.util.ServiceHelper; |
| |
| /** |
| * A Delegate pattern which delegates processing to a nested {@link Processor} which can |
| * be useful for implementation inheritance when writing an {@link org.apache.camel.spi.Policy} |
| * <p/> |
| * <b>Important:</b> This implementation does <b>not</b> support the asynchronous routing engine. |
| * If you are implementing a EIP pattern please use the {@link org.apache.camel.processor.DelegateAsyncProcessor} |
| * instead. |
| * |
| * @version |
| * @see org.apache.camel.processor.DelegateAsyncProcessor |
| */ |
| public class DelegateProcessor extends ServiceSupport implements Processor, Navigate<Processor> { |
| protected Processor processor; |
| |
| public DelegateProcessor() { |
| } |
| |
| public DelegateProcessor(Processor processor) { |
| if (processor == this) { |
| throw new IllegalArgumentException("Recursive DelegateProcessor!"); |
| } |
| this.processor = processor; |
| } |
| |
| public void process(Exchange exchange) throws Exception { |
| processNext(exchange); |
| } |
| |
| protected void processNext(Exchange exchange) throws Exception { |
| if (processor != null) { |
| processor.process(exchange); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return "Delegate[" + processor + "]"; |
| } |
| |
| public Processor getProcessor() { |
| return processor; |
| } |
| |
| public void setProcessor(Processor processor) { |
| this.processor = processor; |
| } |
| |
| protected void doStart() throws Exception { |
| ServiceHelper.startServices(processor); |
| } |
| |
| protected void doStop() throws Exception { |
| ServiceHelper.stopServices(processor); |
| } |
| |
| public boolean hasNext() { |
| return processor != null; |
| } |
| |
| public List<Processor> next() { |
| if (!hasNext()) { |
| return null; |
| } |
| List<Processor> answer = new ArrayList<Processor>(1); |
| answer.add(processor); |
| return answer; |
| } |
| } |