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.bean;
018    
019    import java.lang.reflect.Method;
020    
021    import org.apache.camel.Endpoint;
022    import org.apache.camel.ExchangePattern;
023    import org.apache.camel.Producer;
024    import 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     */
032    public 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    }