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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
* 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.luaj.vm2;


public class LuaUserdata extends LuaValue {
	
	public Object m_instance;
	public LuaValue m_metatable;
	
	public LuaUserdata(Object obj) {
		m_instance = obj;
	}
	
	public LuaUserdata(Object obj, LuaValue metatable) {
		m_instance = obj;
		m_metatable = metatable;
	}
	
	public String tojstring() {
		return String.valueOf(m_instance);
	}
	
	public int type() {
		return LuaValue.TUSERDATA;
	}
	
	public String typename() {
		return "userdata";
	}

	public int hashCode() {
		return m_instance.hashCode();
	}
	
	public Object userdata() {
		return m_instance;
	}
	
	public boolean isuserdata()                        { return true; }
	public boolean isuserdata(Class c)                 { return c.isAssignableFrom(m_instance.getClass()); }
	public Object  touserdata()                        { return m_instance; }
	public Object  touserdata(Class c)                 { return c.isAssignableFrom(m_instance.getClass())? m_instance: null; }
	public Object  optuserdata(Object defval)          { return m_instance; }
	public Object optuserdata(Class c, Object defval) {
		if (!c.isAssignableFrom(m_instance.getClass()))
			typerror(c.getName());
		return m_instance;
	}
	
	public LuaValue getmetatable() {
		return m_metatable;
	}

	public LuaValue setmetatable(LuaValue metatable) {
		this.m_metatable = metatable;
		return this;
	}

	public Object checkuserdata() {
		return m_instance;
	}
	
	public Object checkuserdata(Class c) { 
		if ( c.isAssignableFrom(m_instance.getClass()) )
			return m_instance;		
		return typerror(c.getName());
	}
	
	public LuaValue get( LuaValue key ) {
		return m_metatable!=null? gettable(this,key): NIL;
	}
	
	public void set( LuaValue key, LuaValue value ) {
		if ( m_metatable==null || ! settable(this,key,value) )
			error( "cannot set "+key+" for userdata" );
	}

	public boolean equals( Object val ) {
		if ( this == val )
			return true;
		if ( ! (val instanceof LuaUserdata) )
			return false;
		LuaUserdata u = (LuaUserdata) val;
		return m_instance.equals(u.m_instance);
	}

	// equality w/ metatable processing
	public LuaValue eq( LuaValue val )     { return eq_b(val)? TRUE: FALSE; } 
	public boolean eq_b( LuaValue val ) { 
		if ( val.raweq(this) ) return true;
		if ( m_metatable == null || !val.isuserdata() ) return false;
		LuaValue valmt = val.getmetatable();
		return valmt!=null && LuaValue.eqmtcall(this, m_metatable, val, valmt); 
	}
	
	// equality w/o metatable processing
	public boolean raweq( LuaValue val )      { return val.raweq(this); }
	public boolean raweq( LuaUserdata val )   {
		return this == val || (m_metatable == val.m_metatable && m_instance.equals(val.m_instance)); 
	}
	
	// __eq metatag processing
	public boolean eqmt( LuaValue val ) {
		return m_metatable!=null && val.isuserdata()? LuaValue.eqmtcall(this, m_metatable, val, val.getmetatable()): false; 
	}
}