/*
* $Id: LuaStateFactory.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.util.ArrayList;
import java.util.List;
/**
* This class is responsible for instantiating new LuaStates.
* When a new LuaState is instantiated it is put into a List
* and an index is returned. This index is registred in Lua
* and it is used to find the right LuaState when lua calls
* a Java Function.
*
* @author Thiago Ponte
*/
public final class LuaStateFactory
{
/**
* Array with all luaState's instances
*/
private static final List states = new ArrayList();
/**
* Non-public constructor.
*/
private LuaStateFactory()
{}
/**
* Method that creates a new instance of LuaState
* @return LuaState
*/
public synchronized static LuaState newLuaState()
{
int i = getNextStateIndex();
LuaState L = new LuaState(i);
states.add(i, L);
return L;
}
/**
* Returns a existing instance of LuaState
* @param index
* @return LuaState
*/
public synchronized static LuaState getExistingState(int index)
{
return (LuaState) states.get(index);
}
/**
* Receives a existing LuaState and checks if it exists in the states list.
* If it doesn't exist adds it to the list.
* @param L
* @return int
*/
public synchronized static int insertLuaState(LuaState L)
{
int i;
for (i = 0 ; i < states.size() ; i++)
{
LuaState state = (LuaState) states.get(i);
if (state != null)
{
if (state.getCPtrPeer() == L.getCPtrPeer())
return i;
}
}
i = getNextStateIndex();
states.set(i, L);
return i;
}
/**
* removes the luaState from the states list
* @param idx
*/
public synchronized static void removeLuaState(int idx)
{
states.add(idx, null);
}
/**
* Get next available index
* @return int
*/
private synchronized static int getNextStateIndex()
{
int i;
for ( i=0 ; i < states.size() && states.get(i) != null ; i++ );
return i;
}
}