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Module containing support classes depending on Java SE 6, Guava 11 and Joda-Time 2.0
/*
* Copyright (C) the original author or authors.
*
* 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 net.derquinse.common.reflect;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import net.derquinse.common.base.NotInstantiable;
/**
* Utility methods for Dynamic Proxies.
* @author Andres Rodriguez
*/
public final class Proxies extends NotInstantiable {
/** Not instantiable. */
private Proxies() {
}
public static T alwaysNull(Class type) {
return type.cast(Proxy.newProxyInstance(Proxies.class.getClassLoader(), new Class>[] { type },
AlwaysNull.INSTANCE));
}
public static Object alwaysNull(Class>... interfaces) {
return Proxy.newProxyInstance(Proxies.class.getClassLoader(), interfaces, AlwaysNull.INSTANCE);
}
public static T unsupported(Class type) {
return type.cast(Proxy.newProxyInstance(Proxies.class.getClassLoader(), new Class>[] { type },
Unsupported.INSTANCE));
}
public static Object unsupported(Class>... interfaces) {
return Proxy.newProxyInstance(Proxies.class.getClassLoader(), interfaces, Unsupported.INSTANCE);
}
/** Always null invocation handler. */
private enum AlwaysNull implements InvocationHandler {
INSTANCE;
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
return null;
}
@Override
public String toString() {
return "Always NULL Proxy";
}
}
/** Unsupported operation invocation handler. */
private enum Unsupported implements InvocationHandler {
INSTANCE;
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
throw new UnsupportedOperationException();
}
@Override
public String toString() {
return "UnsupportedOperationException Proxy";
}
}
}
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