package lu.uni.tsopen.utils;

/*-
 * #%L
 * TSOpen - Open-source implementation of TriggerScope
 * 
 * Paper describing the approach : https://seclab.ccs.neu.edu/static/publications/sp2016triggerscope.pdf
 * 
 * %%
 * Copyright (C) 2019 Jordan Samhi
 * University of Luxembourg - Interdisciplinary Centre for
 * Security Reliability and Trust (SnT) - All rights reserved
 *
 * %%
 * This program 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 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-2.1.html>.
 * #L%
 */

import org.logicng.formulas.Formula;

import soot.Unit;

/**
 * This class represents an edge between two unit in a CFG/ICFG.
 * It can be annotated with a predicate.
 * @author Jordan Samhi
 *
 */
public class Edge {

	private final Unit source;
	private final Unit target;
	private Formula predicate;

	public Edge(Unit s, Unit t) {
		this.source = s;
		this.target = t;
		this.predicate = null;
	}

	public Unit getSource() {
		return source;
	}

	public Unit getTarget() {
		return target;
	}

	public Formula getPredicate() {
		return predicate;
	}

	public void setPredicate(Formula predicate) {
		this.predicate = predicate;
	}
	
	public boolean correspondsTo(Unit source, Unit target) {
		return source == this.source && target == this.target;
	}
	
	@Override
	public String toString() {
		return String.format("(%s) -> (%s)", this.source, this.target);
	}

}
