public IdentitySet() 
{
	      	 
		this.map = new IdentityHashMap();
}

Create an IdentitySet with default sizing.

 public IdentitySet(int sizing) 
{
		this.map = new IdentityHashMap( sizing );
}

Create an IdentitySet with the given sizing.

Parameters:

sizing - The sizing of the set to create.

 public boolean add(Object o) 
{
		return map.put( o, DUMP_VALUE ) == null;
}

 public boolean addAll(Collection c) 
{
		Iterator it = c.iterator();
		boolean changed = false;
		while ( it.hasNext() ) {
			if ( this.add( it.next() ) ) {
				changed = true;
			}
		}
		return changed;
}

 public  void clear() 
{
		map.clear();
}

 public boolean contains(Object o) 
{
		return map.get( o ) == DUMP_VALUE;
}

 public boolean containsAll(Collection c) 
{
		Iterator it = c.iterator();
		while ( it.hasNext() ) {
			if ( !map.containsKey( it.next() ) ) {
				return false;
			}
		}
		return true;
}

 public boolean isEmpty() 
{
		return map.isEmpty();
}

 public Iterator iterator() 
{
		return map.entrySet().iterator();
}

 public boolean remove(Object o) 
{
		return map.remove( o ) == DUMP_VALUE;
}

 public boolean removeAll(Collection c) 
{
		Iterator it = c.iterator();
		boolean changed = false;
		while ( it.hasNext() ) {
			if ( this.remove( it.next() ) ) {
				changed = true;
			}
		}
		return changed;
}

 public boolean retainAll(Collection c) 
{
		//doable if needed
		throw new UnsupportedOperationException();
}

 public int size() 
{
		return map.size();
}

 public Object[] toArray() 
{
		return map.entrySet().toArray();
}

 public Object[] toArray(Object[] a) 
{
		return map.entrySet().toArray( a );
}