Condition.java

/*
    Protocol Definition Language
    Copyright (C) 2003-2006 Marcus Andersson

    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 2 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, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package net.sf.nmedit.jpdl;

public class Condition
{
    public Condition(String variable, int value, boolean negative)
    {
	this.variable = variable;
	this.value = value;
	this.negative = negative;
    }

    public boolean eval(Packet packet)
    {
	return negative ^ (packet.getVariable(variable) == value);
    }
    
    private String variable;
    private int value;
    private boolean negative;
    
    public String getSource()
    {
        return (negative?"!":"")+variable+"="+value;
    }
    
    public String toString()
    {
        return getClass().getSimpleName()+"[condition='"+getSource()+"']";
    }
    
}