Edge.java Source File

00001 package edu.ksu.cis.bandera.prog;
00002 
00003 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
00004  * Bandera, a Java(TM) analysis and transformation toolkit           *
00005  * Copyright (C) 1998, 1999   Hongjun Zheng (zheng@cis.ksu.edu)      *
00006  * All rights reserved.                                              *
00007  *                                                                   *
00008  * This work was done as a project in the SAnToS Laboratory,         *
00009  * Department of Computing and Information Sciences, Kansas State    *
00010  * University, USA (http://www.cis.ksu.edu/santos).                  *
00011  * It is understood that any modification not identified as such is  *
00012  * not covered by the preceding statement.                           *
00013  *                                                                   *
00014  * This work is free software; you can redistribute it and/or        *
00015  * modify it under the terms of the GNU Library General Public       *
00016  * License as published by the Free Software Foundation; either      *
00017  * version 2 of the License, or (at your option) any later version.  *
00018  *                                                                   *
00019  * This work is distributed in the hope that it will be useful,      *
00020  * but WITHOUT ANY WARRANTY; without even the implied warranty of    *
00021  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU *
00022  * Library General Public License for more details.                  *
00023  *                                                                   *
00024  * You should have received a copy of the GNU Library General Public *
00025  * License along with this toolkit; if not, write to the             *
00026  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
00027  * Boston, MA  02111-1307, USA.                                      *
00028  *                                                                   *
00029  * Java is a trademark of Sun Microsystems, Inc.                     *
00030  *                                                                   *
00031  * To submit a bug report, send a comment, or get the latest news on *
00032  * this project and other SAnToS projects, please visit the web-site *
00033  *                http://www.cis.ksu.edu/santos                      *
00034  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
00035 import ca.mcgill.sable.util.*;
00036 import edu.ksu.cis.bandera.prog.Index;
00037 
00038 public class Edge
00039 {
00040   Index fromNode;
00041   Index toNode;
00042   private boolean isIndefiniteLoop;
00043   private List naturalLoop;
00044 
00045   public Edge(Index from, Index to)
00046     {
00047       fromNode = from;
00048       toNode = to;
00049       naturalLoop = null;
00050       isIndefiniteLoop = from.index() >= to.index();
00051     }
00052   public List getNaturalLoop()
00053     {
00054       return naturalLoop;
00055     }
00056   public boolean isPossibleIndefiniteLoop()
00057     {
00058       return isIndefiniteLoop;
00059     }
00060   public void setIndefiniteLoop()
00061     {
00062       isIndefiniteLoop = true; 
00063     }
00064   public void setNaturalLoop(List nl)
00065     {
00066       naturalLoop = nl;
00067     }
00068   public String toString()
00069     {
00070       return fromNode + "->" + toNode + " natural loop: " + naturalLoop;
00071     }
00072 }