/*
* Copyright 2000-2012 JetBrains s.r.o.
*
* Licensed 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 com.intellij.vcsUtil;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
* Created with IntelliJ IDEA.
* User: Irina.Chernushina
* Date: 10/22/12
* Time: 10:58 AM
*/
public class PseudoImplementProxy {
public static <T, Impl> T create(final Class<T> theInterface, final Impl implementation) {
checkMethodsExist(theInterface, implementation);
final Class<?> implementationClass = implementation.getClass();
return (T) Proxy.newProxyInstance(theInterface.getClassLoader(), new Class[]{theInterface},
new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
final Method implementationClassMethod =
implementationClass.getMethod(method.getName(), method.getParameterTypes());
implementationClassMethod.setAccessible(true);
return implementationClassMethod.invoke(implementation, args);
}
});
}
private static <T, Impl> void checkMethodsExist(Class<T> theInterface, Impl implementation) {
final Class<?> implementationClass = implementation.getClass();
final Method[] methods = theInterface.getDeclaredMethods();
for (Method method : methods) {
try {
implementationClass.getMethod(method.getName(), method.getParameterTypes());
}
catch (NoSuchMethodException e) {
throw new UnsupportedOperationException(e);
}
}
}
}