New Circularity Tracker

import java.util.*;

public class CircularityTracker {

private IdentityHashMap refs = new IdentityHashMap();

/**

• Get the reference is of the object if it has been tracked.
• @param o
• @return -1 if not contained, otherwise the reference id.
  */
  public int contains(Object o) { Object value = refs.get(o); if( value == null ) return -1; return ((Integer)value).intValue(); }

/**

• Starts tracking the object. Returns its tracking reference for use in xml.
• @param o
• @return
  */
  public int track(Object o) { Integer size = new Integer(refs.size()); refs.put(o, size); return size.intValue(); }

  }