org.apache.cxf.common.util.ProxyHelper Maven / Gradle / Ivy
/**
* 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.cxf.common.util;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
/**
*
*/
public class ProxyHelper {
static final ProxyHelper HELPER;
static {
ProxyHelper theHelper = null;
try {
theHelper = new CglibProxyHelper();
} catch (Throwable ex) {
theHelper = new ProxyHelper();
}
HELPER = theHelper;
}
protected ProxyHelper() {
}
protected Object getProxyInternal(ClassLoader loader, Class[] interfaces, InvocationHandler handler) {
ClassLoader combinedLoader = getClassLoaderForInterfaces(loader, interfaces);
return Proxy.newProxyInstance(combinedLoader, interfaces, handler);
}
/**
* Return a classloader that can see all the given interfaces If the given loader can see all interfaces
* then it is used. If not then a combined classloader of all interface classloaders is returned.
*
* @param loader use supplied class loader
* @param interfaces
* @return classloader that sees all interfaces
*/
private ClassLoader getClassLoaderForInterfaces(ClassLoader loader, Class[] interfaces) {
if (canSeeAllInterfaces(loader, interfaces)) {
return loader;
}
ProxyClassLoader combined = new ProxyClassLoader(interfaces);
for (Class currentInterface : interfaces) {
combined.addLoader(currentInterface.getClassLoader());
}
return combined;
}
private boolean canSeeAllInterfaces(ClassLoader loader, Class[] interfaces) {
for (Class currentInterface : interfaces) {
String ifName = currentInterface.getName();
try {
Class ifClass = Class.forName(ifName, true, loader);
if (ifClass != currentInterface) {
return false;
}
} catch (NoClassDefFoundError e) {
return false;
} catch (ClassNotFoundException e) {
return false;
}
}
return true;
}
public static Object getProxy(ClassLoader loader, Class[] interfaces, InvocationHandler handler) {
return HELPER.getProxyInternal(loader, interfaces, handler);
}
}