l2j-server-game/L2J_Server_BETA/java/com/l2jserver/gameserver/script/Expression.java

/*
 * This program 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.
 * 
 * This program 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);
		}
	}
	
}