/*
Copyright 2002 by Ralph Hartley
This software is licenced under the terms of the
Gnu Public Licence
*/

import java.lang.ref.*;

public class TransparentWeakReference extends WeakReference implements Comparable {

  int hash;

  public TransparentWeakReference(Object target) {
    super(target);
    hash = target.hashCode();
  }

  public int hashCode() {
    return(hash);
  }

  public boolean equals(Object that) {
    if (hash!=that.hashCode()) return(false);
    return(compareTo(that)==0);
  }

  public int compareTo(Object that) {
    if (that==this) return(0);
    if (that==null) return(-1);
    Object target = get();
    if (that instanceof WeakReference)
      that = ((WeakReference)that).get();
    if (target==that) return(0);
    if (target==null) return(1);
    if (target instanceof Comparable)
      return(((Comparable)target).compareTo(that));
    return(-1);
  }
}