/**
 * Copyright 2006-2009 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 ext.test4j.objenesis.instantiator.sun;

import java.lang.reflect.Constructor;

import sun.reflect.ReflectionFactory;
import ext.test4j.objenesis.ObjenesisException;
import ext.test4j.objenesis.instantiator.ObjectInstantiator;

/**
 * Instantiates an object, WITHOUT calling it's constructor, using internal
 * sun.reflect.ReflectionFactory - a class only available on JDK's that use
 * Sun's 1.4 (or later) Java implementation. This is the best way to instantiate
 * an object without any side effects caused by the constructor - however it is
 * not available on every platform.
 * 
 * @author Joe Walnes
 * @see ObjectInstantiator
 */
@SuppressWarnings({ "rawtypes", "restriction" })
public class SunReflectionFactoryInstantiator implements ObjectInstantiator {

	private final Constructor mungedConstructor;

	public SunReflectionFactoryInstantiator(Class type) {

		ReflectionFactory reflectionFactory = ReflectionFactory.getReflectionFactory();
		Constructor javaLangObjectConstructor;

		try {
			javaLangObjectConstructor = Object.class.getConstructor((Class[]) null);
		} catch (NoSuchMethodException e) {
			throw new Error("Cannot find constructor for java.lang.Object!");
		}
		mungedConstructor = reflectionFactory.newConstructorForSerialization(type, javaLangObjectConstructor);
		mungedConstructor.setAccessible(true);
	}

	public Object newInstance() {
		try {
			return mungedConstructor.newInstance((Object[]) null);
		} catch (Exception e) {
			throw new ObjenesisException(e);
		}
	}
}