/**
 * 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.io.NotSerializableException;
import java.lang.reflect.Constructor;

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

/**
 * Instantiates an object using internal sun.reflect.ReflectionFactory - a class
 * only available on JDK's that use Sun's 1.4 (or later) Java implementation.
 * This instantiator will create classes in a way compatible with serialization,
 * calling the first non-serializable superclass' no-arg constructor. 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 Leonardo Mesquita
 * @see ObjectInstantiator
 */
@SuppressWarnings({ "unchecked", "rawtypes", "restriction" })
public class SunReflectionFactorySerializationInstantiator implements ObjectInstantiator {

	private final Constructor mungedConstructor;

	public SunReflectionFactorySerializationInstantiator(Class type) {

		Class nonSerializableAncestor = SerializationInstantiatorHelper.getNonSerializableSuperClass(type);
		ReflectionFactory reflectionFactory = ReflectionFactory.getReflectionFactory();
		Constructor nonSerializableAncestorConstructor;
		try {
			nonSerializableAncestorConstructor = nonSerializableAncestor.getConstructor((Class[]) null);
		} catch (NoSuchMethodException e) {
			/**
			 * @todo (Henri) I think we should throw a NotSerializableException
			 *       just to put the same message a ObjectInputStream.
			 *       Otherwise, the user won't know if the null returned if a
			 *       "Not serializable", a "No default constructor on ancestor"
			 *       or a "Exception in constructor"
			 */
			throw new ObjenesisException(new NotSerializableException(type + " has no suitable superclass constructor"));
		}

		mungedConstructor = reflectionFactory.newConstructorForSerialization(type, nonSerializableAncestorConstructor);
		mungedConstructor.setAccessible(true);
	}

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