/* File: HashedSet.java
 * Contains: A set collector based on Hashtables.
 * Author: Jeff Dalton <J.Dalton@ed.ac.uk>
 * Created: March 1998
 * Updated: Sun May 20 17:22:19 2001 by Jeff Dalton
 * Copyright: (c) 1998, AIAI, University of Edinburgh
 */

package ix.ileed;

import java.util.Hashtable;
import java.util.Enumeration;

import ix.util.Collector;

/**
 * A set collector based on Hashtables.
 *
 * A HashSet can used to collect objects when (a) the same object might
 * be added more than once, (b) no object should appear more than once
 * in an enumeration of the collected elements, and (c) the order of
 * objects in the element-enumeration doesn't matter.
 *
 * @see ix.util.Seq
 * @see ix.util.lisp.LListCollector
 */

public class HashedSet extends Hashtable implements Collector {

    public HashedSet() {
	super();
    }

    public void addElement(Object e) {
	put(e, e);
    }

    public Object result() {
	return this;		// /\/
    }

}