/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * NullProxy is a java dynamic proxy that wraps an object referenced by it's
 * interface rather than it's concrete type.
 * 
 * Copyright (C) 2003  R. Dale Asberry
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     R. Dale Asberry - initial implementation
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

package test;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import java.util.ArrayList;

public class NullProxy implements InvocationHandler
{
	private String cProxiedType = null;
	private NullPointerException cNpe = null;
	
	public NullProxy(String pType, NullPointerException pNpe)
	{
		cProxiedType = pType;
		cNpe = pNpe;
	}
	
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
	{
		NullPointerException lNpe = new NullPointerException();
		if(!"hashCode".equals(method.getName()))
		{
			StackTraceElement [] lStackTrace = lNpe.getStackTrace();
			
			ArrayList lNewStackTraceElements = new ArrayList();
			for(int i = 0; i < lStackTrace.length; i++)
			{
				//Filter out confusing aspect-related stack trace elements
				if
				(
					!(lStackTrace[i].toString().indexOf("_aroundBody") > -1) && 
					!(lStackTrace[i].toString().indexOf("NullProxy.invoke") > -1) && 
					!(lStackTrace[i].toString().indexOf("$Proxy") > -1)
				)
				{
					lNewStackTraceElements.add(lStackTrace[i]);
				}
			}
			StackTraceElement [] lNewStackTrace = new StackTraceElement [lNewStackTraceElements.size()];
			for(int i = 0; i < lNewStackTraceElements.size(); i++)
			{
				lNewStackTrace[i] = (StackTraceElement)lNewStackTraceElements.get(i);
			}
			
			lNpe.setStackTrace(lNewStackTrace);
			lNpe.initCause(cNpe);
			throw lNpe;
		}
		return new Integer(this.hashCode());
	}
}