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/**
 * 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.perc;

import java.io.ObjectInputStream;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import ext.test4j.objenesis.ObjenesisException;
import ext.test4j.objenesis.instantiator.ObjectInstantiator;

/**
 * Instantiates a class by making a call to internal Perc private methods. It is
 * only supposed to work on Perc JVMs. This instantiator will create classes in
 * a way compatible with serialization, calling the first non-serializable
 * superclass' no-arg constructor.
 * 
 * Based on code provided by Aonix but doesn't work right now
 * 
 * @author Henri Tremblay
 * @see org.objenesis.instantiator.ObjectInstantiator
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public class PercSerializationInstantiator implements ObjectInstantiator {

	private Object[] typeArgs;

	private final java.lang.reflect.Method newInstanceMethod;

	public PercSerializationInstantiator(Class type) {

		// Find the first unserializable parent class
		Class unserializableType = type;

		while (Serializable.class.isAssignableFrom(unserializableType)) {
			unserializableType = unserializableType.getSuperclass();
		}

		try {
			// Get the special Perc method to call
			Class percMethodClass = Class.forName("COM.newmonics.PercClassLoader.Method");

			newInstanceMethod = ObjectInputStream.class.getDeclaredMethod("noArgConstruct", new Class[] { Class.class,
					Object.class, percMethodClass });
			newInstanceMethod.setAccessible(true);

			// Create invoke params
			Class percClassClass = Class.forName("COM.newmonics.PercClassLoader.PercClass");
			Method getPercClassMethod = percClassClass.getDeclaredMethod("getPercClass", new Class[] { Class.class });
			Object someObject = getPercClassMethod.invoke(null, new Object[] { unserializableType });
			Method findMethodMethod = someObject.getClass().getDeclaredMethod("findMethod",
					new Class[] { String.class });
			Object percMethod = findMethodMethod.invoke(someObject, new Object[] { "()V" });

			typeArgs = new Object[] { unserializableType, type, percMethod };

		} catch (ClassNotFoundException e) {
			throw new ObjenesisException(e);
		} catch (NoSuchMethodException e) {
			throw new ObjenesisException(e);
		} catch (InvocationTargetException e) {
			throw new ObjenesisException(e);
		} catch (IllegalAccessException e) {
			throw new ObjenesisException(e);
		}
	}

	public Object newInstance() {
		try {
			return newInstanceMethod.invoke(null, typeArgs);
		} catch (IllegalAccessException e) {
			throw new ObjenesisException(e);
		} catch (InvocationTargetException e) {
			throw new ObjenesisException(e);
		}
	}

}