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.component.pojo;
018    
019    import org.apache.camel.Consumer;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.NoSuchEndpointException;
022    import org.apache.camel.Processor;
023    import org.apache.camel.Producer;
024    import org.apache.camel.Component;
025    import org.apache.camel.impl.DefaultEndpoint;
026    import org.apache.camel.impl.DefaultProducer;
027    import org.apache.camel.spi.Provider;
028    
029    import java.lang.reflect.InvocationTargetException;
030    
031    /**
032     * Represents a pojo endpoint that uses reflection
033     * to send messages around.
034     *
035     * @version $Revision: 519973 $
036     */
037    public class PojoEndpoint extends DefaultEndpoint<PojoExchange> {
038        private Object pojo;
039    
040        public PojoEndpoint(String uri, Component component, Object pojo) {
041            super(uri, component);
042            this.pojo = pojo;
043        }
044    
045        public Producer<PojoExchange> createProducer() throws Exception {
046            final Object pojo = getPojo();
047            if (pojo == null) {
048                throw new NoPojoAvailableException(this);
049            }
050    
051            return new DefaultProducer(this) {
052                public void process(Exchange exchange) {
053                    PojoExchange pojoExchange = toExchangeType(exchange);
054                    invoke(pojo, pojoExchange);
055                    exchange.copyFrom(pojoExchange);
056                }
057            };
058        }
059    
060        public Consumer<PojoExchange> createConsumer(Processor processor) throws Exception {
061            throw new Exception("You cannot consume from pojo endpoints.");
062        }
063    
064        /**
065         * This causes us to invoke the endpoint Pojo using reflection.
066         *
067         * @param pojo
068         */
069        public static void invoke(Object pojo, PojoExchange exchange) {
070            PojoInvocation invocation = exchange.getInvocation();
071            try {
072                Object response = invocation.getMethod().invoke(pojo, invocation.getArgs());
073                exchange.getOut().setBody(response);
074            }
075            catch (InvocationTargetException e) {
076                exchange.setException(e.getCause());
077            }
078            catch (RuntimeException e) {
079                throw e;
080            }
081            catch (Throwable e) {
082                throw new RuntimeException(e);
083            }
084        }
085    
086        public PojoExchange createExchange() {
087            return new PojoExchange(getContext());
088        }
089    
090        public boolean isSingleton() {
091            return true;
092        }
093    
094        public Object getPojo() {
095            return pojo;
096        }
097    
098        public void setPojo(Object pojo) {
099            this.pojo = pojo;
100        }
101    }