/* Soot - a J*va Optimization Framework
* Copyright (C) 2005 Antoine Mine
*
* 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.
*/
/**
* Implementation of the paper "A Combined Pointer and Purity Analysis for
* Java Programs" by Alexandru Salcianu and Martin Rinard, within the
* Soot Optimization Framework.
*
* by Antoine Mine, 2005/01/24
*/
package soot.jimple.toolkits.annotation.purity;
/**
* An edge in a purity graph.
* Each edge has a soruce PurityNode, a taget PurityNode, and a field label
* (we use a String here).
* To represent an array element, the convention is to use the [] field label.
* Edges are mmuable and hashable. They compare equal only if they link
* equal nodes and have equal labels.
*
*/
public class PurityEdge
{
private String field;
private PurityNode source, target;
private boolean inside;
PurityEdge(PurityNode source, String field, PurityNode target, boolean inside)
{
this.source = source;
this.field = field;
this.target = target;
this.inside = inside;
}
public String getField() { return field; }
public PurityNode getTarget() { return target; }
public PurityNode getSource() { return source; }
public boolean isInside() { return inside; }
public int hashCode()
{ return field.hashCode()+target.hashCode()+source.hashCode()+(inside?69:0); }
public boolean equals(Object o)
{
if (!(o instanceof PurityEdge)) return false;
PurityEdge e = (PurityEdge)o;
return source.equals(e.source) && field.equals(e.field)
&& target.equals(e.target) && inside==e.inside;
}
public String toString()
{
if (inside)
return source.toString()+" = "+field+" => "+target.toString();
else
return source.toString()+" - "+field+" -> "+target.toString();
}
}