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/*******************************************************************************
* Copyright (c) 2009 Luaj.org. All rights reserved.
*
* 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
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
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package org.luaj.vm2.lib.jse;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import org.luaj.vm2.Globals;
import org.luaj.vm2.LuaError;
import org.luaj.vm2.LuaTable;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Varargs;
import org.luaj.vm2.compiler.LuaC;
import org.luaj.vm2.lib.LibFunction;
import org.luaj.vm2.lib.VarArgFunction;
/**
* Subclass of {@link LibFunction} which implements the features of the luajava package.
*
* Luajava is an approach to mixing lua and java using simple functions that bind
* java classes and methods to lua dynamically. The API is documented on the
* luajava documentation pages.
*
*
* Typically, this library is included as part of a call to
* {@link org.luaj.vm2.lib.jse.JsePlatform#standardGlobals()}
*
{@code
* Globals globals = JsePlatform.standardGlobals();
* System.out.println( globals.get("luajava").get("bindClass").call( LuaValue.valueOf("java.lang.System") ).invokeMethod("currentTimeMillis") );
* }
*
* To instantiate and use it directly,
* link it into your globals table via {@link Globals#load} using code such as:
*
{@code
* Globals globals = new Globals();
* globals.load(new JseBaseLib());
* globals.load(new PackageLib());
* globals.load(new LuajavaLib());
* globals.load(
* "sys = luajava.bindClass('java.lang.System')\n"+
* "print ( sys:currentTimeMillis() )\n", "main.lua" ).call();
* }
*
*
* The {@code luajava} library is available
* on all JSE platforms via the call to {@link org.luaj.vm2.lib.jse.JsePlatform#standardGlobals()}
* and the luajava api's are simply invoked from lua.
* Because it makes extensive use of Java's reflection API, it is not available
* on JME, but can be used in Android applications.
*
* This has been implemented to match as closely as possible the behavior in the corresponding library in C.
*
* @see LibFunction
* @see org.luaj.vm2.lib.jse.JsePlatform
* @see org.luaj.vm2.lib.jme.JmePlatform
* @see LuaC
* @see CoerceJavaToLua
* @see CoerceLuaToJava
* @see http://www.keplerproject.org/luajava/manual.html#luareference
*/
public class LuajavaLib extends VarArgFunction {
static final int INIT = 0;
static final int BINDCLASS = 1;
static final int NEWINSTANCE = 2;
static final int NEW = 3;
static final int CREATEPROXY = 4;
static final int LOADLIB = 5;
static final String[] NAMES = {
"bindClass",
"newInstance",
"new",
"createProxy",
"loadLib",
};
static final int METHOD_MODIFIERS_VARARGS = 0x80;
public LuajavaLib() {
}
public Varargs invoke(Varargs args) {
try {
switch ( opcode ) {
case INIT: {
// LuaValue modname = args.arg1();
LuaValue env = args.arg(2);
LuaTable t = new LuaTable();
bind( t, this.getClass(), NAMES, BINDCLASS );
env.set("luajava", t);
env.get("package").get("loaded").set("luajava", t);
return t;
}
case BINDCLASS: {
final Class clazz = classForName(args.checkjstring(1));
return JavaClass.forClass(clazz);
}
case NEWINSTANCE:
case NEW: {
// get constructor
final LuaValue c = args.checkvalue(1);
final Class clazz = (opcode==NEWINSTANCE? classForName(c.tojstring()): (Class) c.checkuserdata(Class.class));
final Varargs consargs = args.subargs(2);
return JavaClass.forClass(clazz).getConstructor().invoke(consargs);
}
case CREATEPROXY: {
final int niface = args.narg()-1;
if ( niface <= 0 )
throw new LuaError("no interfaces");
final LuaValue lobj = args.checktable(niface+1);
// get the interfaces
final Class[] ifaces = new Class[niface];
for ( int i=0; i