/*
* $Id: LuaInvocationHandler.java,v 1.4 2006/12/22 14:06:40 thiago Exp $
* Copyright (C) 2003-2007 Kepler Project.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.keplerproject.luajava;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
/**
* Class that implements the InvocationHandler interface.
* This class is used in the LuaJava's proxy system.
* When a proxy object is accessed, the method invoked is
* called from Lua
* @author Rizzato
* @author Thiago Ponte
*/
public class LuaInvocationHandler implements InvocationHandler
{
private LuaObject obj;
public LuaInvocationHandler(LuaObject obj)
{
this.obj = obj;
}
/**
* Function called when a proxy object function is invoked.
*/
public Object invoke(Object proxy, Method method, Object[] args) throws LuaException
{
synchronized(obj.L)
{
String methodName = method.getName();
LuaObject func = obj.getField(methodName);
if ( func.isNil() )
{
return null;
}
Class retType = method.getReturnType();
Object ret;
// Checks if returned type is void. if it is returns null.
if ( retType.equals( Void.class ) || retType.equals( void.class ) )
{
func.call( args , 0 );
ret = null;
}
else
{
ret = func.call(args, 1)[0];
if( ret != null && ret instanceof Double )
{
ret = LuaState.convertLuaNumber((Double) ret, retType);
}
}
return ret;
}
}
}