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 */
017package org.apache.camel.component.bean;
018
019import java.lang.reflect.Method;
020
021import org.apache.camel.Endpoint;
022import org.apache.camel.ExchangePattern;
023import org.apache.camel.Producer;
024import org.apache.camel.RuntimeCamelException;
025
026/**
027 * Special {@link java.lang.reflect.InvocationHandler} for methods that have only one parameter. This
028 * parameter is directly sent to as the body of the message. The idea is to use
029 * that as a very open message format especially when combined with e.g. JAXB
030 * serialization.
031 */
032public class PojoMessageInvocationHandler extends AbstractCamelInvocationHandler {
033
034    public PojoMessageInvocationHandler(Endpoint endpoint, Producer producer) {
035        super(endpoint, producer);
036    }
037
038    @Override
039    public Object doInvokeProxy(Object proxy, Method method, Object[] args) throws Throwable {
040        int argsLength = (args == null) ? 0 : args.length;
041        if (argsLength != 1) {
042            throw new RuntimeCamelException(String.format("Error creating proxy for %s.%s Number of arguments must be 1 but is %d", 
043                                                          method.getDeclaringClass().getName(),
044                                                          method.getName(), argsLength));
045        }
046        final ExchangePattern pattern = method.getReturnType() != Void.TYPE ? ExchangePattern.InOut : ExchangePattern.InOnly;
047        return invokeWithBody(method, args[0], pattern);
048    }
049
050}