001/**
002 * Copyright (C) 2011 rwoo@gmx.de
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *         http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package com.googlecode.catchexception.throwable.internal;
017
018import java.util.HashSet;
019import java.util.Set;
020
021import org.mockito.cglib.proxy.Enhancer;
022import org.mockito.cglib.proxy.MethodInterceptor;
023
024/**
025 * This {@link ProxyFactory} create proxies that implements all interfaces of
026 * the underlying object including the marker interface
027 * {@link InterfaceOnlyProxy}. But in contrast to the proxies created by
028 * {@link SubclassProxyFactory} such a proxy does not subclass the class of the
029 * underlying object.
030 * 
031 * @author rwoo
032 */
033public class InterfaceOnlyProxyFactory implements ProxyFactory {
034
035    /*
036     * (non-Javadoc)
037     * 
038     * @see
039     * com.googlecode.catchthrowable.internal.ProxyFactory#createProxy(java.
040     * lang.Class, org.mockito.cglib.proxy.MethodInterceptor)
041     */
042    @SuppressWarnings("unchecked")
043    public <T> T createProxy(Class<?> targetClass, MethodInterceptor interceptor) {
044
045        // get all the interfaces (is there an easier way?)
046        Set<Class<?>> interfaces = new HashSet<Class<?>>();
047        Class<?> clazz = targetClass;
048        while (true) {
049            for (Class<?> interfaze : clazz.getInterfaces()) {
050                interfaces.add(interfaze);
051            }
052            if (clazz.getSuperclass() == null) {
053                break;
054            }
055            clazz = clazz.getSuperclass();
056        }
057        interfaces.add(InterfaceOnlyProxy.class);
058
059        return (T) Enhancer.create(Object.class,
060                interfaces.toArray(new Class<?>[interfaces.size()]),
061                interceptor);
062    }
063}