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.Proxy;
020
021 import org.apache.camel.Endpoint;
022 import org.apache.camel.Producer;
023
024 /**
025 * A helper class for creating proxies which delegate to Camel
026 *
027 * @version $Revision: 747062 $
028 */
029 public final class ProxyHelper {
030
031 /**
032 * Utility classes should not have a public constructor.
033 */
034 private ProxyHelper() {
035 }
036
037 /**
038 * Creates a Proxy which sends PojoExchange to the endpoint.
039 */
040 @SuppressWarnings("unchecked")
041 public static Object createProxyObject(Endpoint endpoint, Producer producer, ClassLoader classLoader, Class[] interfaces, MethodInfoCache methodCache) {
042 return Proxy.newProxyInstance(classLoader, interfaces.clone(), new CamelInvocationHandler(endpoint, producer, methodCache));
043 }
044
045
046 /**
047 * Creates a Proxy which sends PojoExchange to the endpoint.
048 */
049 @SuppressWarnings("unchecked")
050 public static <T> T createProxy(Endpoint endpoint, ClassLoader cl, Class[] interfaces, MethodInfoCache methodCache) throws Exception {
051 return (T) createProxyObject(endpoint, endpoint.createProducer(), cl, interfaces, methodCache);
052 }
053
054 /**
055 * Creates a Proxy which sends PojoExchange to the endpoint.
056 */
057 @SuppressWarnings("unchecked")
058 public static <T> T createProxy(Endpoint endpoint, ClassLoader cl, Class<T>... interfaceClasses) throws Exception {
059 return (T) createProxy(endpoint, cl, interfaceClasses, createMethodInfoCache(endpoint));
060 }
061
062
063 /**
064 * Creates a Proxy which sends PojoExchange to the endpoint.
065 */
066 @SuppressWarnings("unchecked")
067 public static <T> T createProxy(Endpoint endpoint, Class<T>... interfaceClasses) throws Exception {
068 return (T) createProxy(endpoint, getClassLoader(interfaceClasses), interfaceClasses);
069 }
070
071 /**
072 * Creates a Proxy which sends PojoExchange to the endpoint.
073 */
074 @SuppressWarnings("unchecked")
075 public static <T> T createProxy(Endpoint endpoint, Producer producer, Class<T>... interfaceClasses) throws Exception {
076 return (T) createProxyObject(endpoint, producer, getClassLoader(interfaceClasses), interfaceClasses, createMethodInfoCache(endpoint));
077 }
078
079 /**
080 * Returns the class loader of the first interface or throws {@link IllegalArgumentException} if there are no interfaces specified
081 */
082 protected static ClassLoader getClassLoader(Class... interfaces) {
083 if (interfaces == null || interfaces.length < 1) {
084 throw new IllegalArgumentException("You must provide at least 1 interface class.");
085 }
086 return interfaces[0].getClassLoader();
087 }
088
089 protected static MethodInfoCache createMethodInfoCache(Endpoint endpoint) {
090 return new MethodInfoCache(endpoint.getCamelContext());
091 }
092
093 }