l2j-server-game/src/main/java/com/l2jserver/gameserver/script/Expression.java

/*
 * Copyright (C) 2004-2018 L2J Server
 * 
 * This file is part of L2J Server.
 * 
 * L2J Server is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * L2J Server is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.l2jserver.gameserver.script;

import java.util.logging.Level;
import java.util.logging.Logger;

import javax.script.ScriptContext;

import com.l2jserver.gameserver.scripting.L2ScriptEngineManager;

public class Expression
{
	protected static final Logger _log = Logger.getLogger(Expression.class.getName());
	private final ScriptContext _context;
	@SuppressWarnings("unused")
	private final String _lang;
	@SuppressWarnings("unused")
	private final String _code;
	
	public static Object eval(String lang, String code)
	{
		try
		{
			return L2ScriptEngineManager.getInstance().eval(lang, code);
		}
		catch (Exception e)
		{
			_log.log(Level.WARNING, "", e);
			return null;
		}
	}
	
	public static Object eval(ScriptContext context, String lang, String code)
	{
		try
		{
			return L2ScriptEngineManager.getInstance().eval(lang, code, context);
		}
		catch (Exception e)
		{
			_log.log(Level.WARNING, "", e);
			return null;
		}
	}
	
	public static Expression create(ScriptContext context, String lang, String code)
	{
		try
		{
			return new Expression(context, lang, code);
		}
		catch (Exception e)
		{
			_log.log(Level.WARNING, "", e);
			return null;
		}
	}
	
	private Expression(ScriptContext pContext, String pLang, String pCode)
	{
		_context = pContext;
		_lang = pLang;
		_code = pCode;
	}
	
	public <T> void addDynamicVariable(String name, T value)
	{
		try
		{
			_context.setAttribute(name, value, ScriptContext.ENGINE_SCOPE);
		}
		catch (Exception e)
		{
			_log.log(Level.WARNING, "", e);
		}
	}
	
	public void removeDynamicVariable(String name)
	{
		try
		{
			_context.removeAttribute(name, ScriptContext.ENGINE_SCOPE);
		}
		catch (Exception e)
		{
			_log.log(Level.WARNING, "", e);
		}
	}
	
}