ScriptControllerImpl.java

/**
 * eAdventure (formerly <e-Adventure> and <e-Game>) is a research project of the
 *    <e-UCM> research group.
 *
 *    Copyright 2005-2010 <e-UCM> research group.
 *
 *    You can access a list of all the contributors to eAdventure at:
 *          http://e-adventure.e-ucm.es/contributors
 *
 *    <e-UCM> is a research group of the Department of Software Engineering
 *          and Artificial Intelligence at the Complutense University of Madrid
 *          (School of Computer Science).
 *
 *          C Profesor Jose Garcia Santesmases sn,
 *          28040 Madrid (Madrid), Spain.
 *
 *          For more info please visit:  <http://e-adventure.e-ucm.es> or
 *          <http://www.e-ucm.es>
 *
 * ****************************************************************************
 *
 *  This file is part of eAdventure, version 2.0
 *
 *      eAdventure is free software: you can redistribute it and/or modify
 *      it under the terms of the GNU Lesser General Public License as published by
 *      the Free Software Foundation, either version 3 of the License, or
 *      (at your option) any later version.
 *
 *      eAdventure 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 Lesser General Public License for more details.
 *
 *      You should have received a copy of the GNU Lesser General Public License
 *      along with eAdventure.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package es.eucm.ead.editor.control;

import es.eucm.ead.editor.view.components.OutputLogPanel;
import es.eucm.ead.tools.java.utils.FileUtils;
import java.io.IOException;
import java.io.Writer;
import static java.lang.System.out;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author mfreire
 */
public class ScriptControllerImpl implements ScriptController {

	private static Logger logger = LoggerFactory
			.getLogger(ScriptControllerImpl.class);

	private ScriptEngineManager mgr = new ScriptEngineManager();
	private ScriptEngine jsEngine;

	private Controller controller;

	public ScriptControllerImpl() {
		jsEngine = mgr.getEngineByName("JavaScript");
		ScriptContext sc = jsEngine.getContext();
		sc.setWriter(new Writer() {
			private StringBuilder sb = new StringBuilder();
			private Logger jsLog = LoggerFactory.getLogger("js");

			@Override
			public void write(char[] cbuf, int off, int len) throws IOException {
				sb.append(cbuf, off, len);
			}

			@Override
			public void flush() throws IOException {
				jsLog.info(sb.toString());
				sb.setLength(0);
			}

			@Override
			public void close() throws IOException {
			}
		});
	}

	@Override
	public ScriptContext getContext() {
		return jsEngine.getContext();
	}

	@Override
	public void refreshScripts() {
		logger.info("Refreshing scripts...");

		Bindings b = jsEngine.createBindings();
		b.put("controller", controller);

		jsEngine.setBindings(b, ScriptContext.GLOBAL_SCOPE);
		try {
			String r = FileUtils.loadResourceToString("/scripts/env.js");
			eval(r, null, getContext(), "refresh");
		} catch (IOException ex) {
			logger.warn("Error reading resource", ex);
		}
	}

	@Override
	public Object eval(String script, OutputLogPanel out,
			ScriptContext context, String source) {
		try {
			long ms = System.currentTimeMillis();
			Object output = jsEngine.eval(script, context);
			ms = System.currentTimeMillis() - ms;
			if (out != null) {
				out.append("Evaluated " + script.length() + " chars from "
						+ source + " in " + ms + " ms:", "");
				out.append(" -- ", (output == null) ? "(null)" : output
						.toString());
			} else {
				logger.info("Evaluated {} chars from {} in {} ms: {}", script
						.length(), source, ms, output);
			}
			return output;
		} catch (ScriptException ex) {
			Throwable c = ex.getCause();
			while (c != null && !(c.getClass().getName().endsWith("EcmaError"))) {
				c = c.getCause();
			}
			String error = (c == null ? ex.getMessage() : c.getMessage());
			if (out != null) {
				out.append(" E ", error);
				logger.info(error, ex);
			} else {
				logger.info(" E " + error, ex);
			}
			return null;
		}
	}

	/**
	 * Set the actual super-controller.
	 * @param controller the main controller, providing access to model, views,
	 * and more
	 */
	@Override
	public void setController(Controller controller) {
		this.controller = controller;
		refreshScripts();
	}
}