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Module containing support classes depending on Java SE 6, Guava 11 and Joda-Time 2.0

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/*
 * 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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