/*******************************************************************************
 * Copyright (c) 2004-2008 Andras Schmidt, Andras Balogh, Istvan Rath and Daniel Varro
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Andras Schmidt, Andras Balogh, Istvan Rath - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.logger;

/**
 * @author Istvan Rath
 *
 */

import java.io.FileOutputStream;
import java.io.PrintStream;

import org.eclipse.viatra2.framework.properties.VPMProperties;

public class SimpleLogger implements Logger {

	PrintStream out;

	public SimpleLogger() {
		out = System.out;
	}

	int level = 100;

	public void setLevel(int l) {
		level = l;
	}

	public void warning(String s) {
		message(Logger.WARNING, s);
	}

	public void error(String s) {
		message(Logger.ERROR, s);
	}

	public void debug(String s) {
		message(Logger.DEBUG, s);
	}

	public void fatal(String s) {
		message(Logger.FATAL, s);
	}

	public void info(String s) {
		message(Logger.INFO, s);
	}

	public void init(VPMProperties props) {

		try {
			String outs = props.getRuntimeProperty("log", "output");
			if ( outs == null || outs.equals("screen") || outs.equals("") ) 
				out = System.out;
			else
				out = new PrintStream(new FileOutputStream(outs));
		} catch (Exception ex) {
			System.out.println("Couldn't initialize logger.");
			System.out.println("Stopping VPM session.");
			System.exit(1);
		}
	}

	public void message(int level, String msg, Throwable cause) {
		if (this.level >= level) {
			out.println("[" + Logger.levelnames[level] + "] " + msg);
			if (cause != null) {
				out.println("[" + Logger.levelnames[level]
						+ "] Exception stack trace follows:");
				cause.printStackTrace();
			}
		}
	}

	public void message(int level, String msg) {
		message(level, msg, null);
	}

	public void printStackTrace(Throwable t) {
		System.out.println("[exception track trace]");
		t.printStackTrace();
	}
}