/**
 * COPYRIGHT & LICENSE
 *
 * This code is Copyright (c) 2006 BEA Systems, inc. It is provided free, as-is and without any warranties for the purpose of
 * inclusion in Objenesis or any other open source project with a FSF approved license, as long as this notice is not
 * removed. There are no limitations on modifying or repackaging the code apart from this. 
 *
 * BEA does not guarantee that the code works, and provides no support for it. Use at your own risk.
 *
 * Originally developed by Leonardo Mesquita. Copyright notice added by Henrik St�hl, BEA JRockit Product Manager.
 *  
 */
package ext.test4j.objenesis.instantiator.jrockit;

import java.lang.reflect.Constructor;
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 JRockit private methods. It
 * is only supposed to work on JRockit 7.0 JVMs, which are compatible with Java
 * API 1.3.1. This instantiator will not call any constructors.
 * 
 * @author Leonardo Mesquita
 * @see org.objenesis.instantiator.ObjectInstantiator
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public class JRockit131Instantiator implements ObjectInstantiator {

	private Constructor mungedConstructor;

	private static Method newConstructorForSerializationMethod;

	private static void initialize() {
		if (newConstructorForSerializationMethod == null) {
			Class cl;
			try {
				cl = Class.forName("COM.jrockit.reflect.MemberAccess");
				newConstructorForSerializationMethod = cl.getDeclaredMethod("newConstructorForSerialization",
						new Class[] { Constructor.class, Class.class });
				newConstructorForSerializationMethod.setAccessible(true);
			} catch (RuntimeException e) {
				throw new ObjenesisException(e);
			} catch (ClassNotFoundException e) {
				throw new ObjenesisException(e);
			} catch (NoSuchMethodException e) {
				throw new ObjenesisException(e);
			}
		}
	}

	public JRockit131Instantiator(Class type) {
		initialize();

		if (newConstructorForSerializationMethod != null) {

			Constructor javaLangObjectConstructor;

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

			try {
				mungedConstructor = (Constructor) newConstructorForSerializationMethod.invoke(null, new Object[] {
						javaLangObjectConstructor, type });
			} catch (Exception e) {
				throw new ObjenesisException(e);
			}
		}

	}

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