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RoboVM fork of Soot - A Java optimization framework

There is a newer version: 2.5.0-9

/* Soot - a J*va Optimization Framework
 * Copyright (C) 2007 Eric Bodden
 *
 * 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 soot.jimple.toolkits.infoflow;

import java.util.WeakHashMap;

import soot.EquivalentValue;
import soot.Value;

/**
 * An {@link EquivalentValue} with cached hash code and equals-relation.
 * @author Eric Bodden 
 */
public class CachedEquivalentValue extends EquivalentValue {

	protected int code = Integer.MAX_VALUE;
	
	protected WeakHashMap isEquivalent = new WeakHashMap();
	
	public CachedEquivalentValue(Value e) {
		super(e);
	}
	
	public int hashCode() {
		if(code==Integer.MAX_VALUE) {
			code = super.hashCode();
		}		
		return code; 
	}
	
	public boolean equals(Object o) {
		if(this.getClass()!=o.getClass()) {
			return false;
		}
		EquivalentValue ev = (EquivalentValue) o;
		Value v = ev.getValue();
		Boolean b = isEquivalent.get(v);
		if(b==null) {
			b = super.equals(o);
			isEquivalent.put(v,b);
		} 		
		return b;
	}

}