SpyEvent.java

/*
 * tuProlog - Copyright (C) 2001-2002  aliCE team at deis.unibo.it
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package alice.tuprolog.event;

import alice.tuprolog.Engine;

import java.util.EventObject;

/**
 *  This class defines an internal event generated by the Prolog core.
 */
public class SpyEvent extends EventObject {

	private static final long serialVersionUID = 2821739172230760654L;
	
	/** event description */
	private String msg;
	private Engine env;

	public SpyEvent(Object source, String msg) {
		super(source);
		this.msg = msg;
	}

	public SpyEvent(Object source, Engine env, String msg) {
		super(source);
		this.env = env;
		this.msg = msg;
	}

	public String getMsg() {
		return msg;
	}

	public Engine getSnapshot() {
		return env;
	}

	@Override
	public String toString() {
		return msg + ((env == null) ? "" : env.toString());
	}

}