/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil -*-
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is the Grendel mail/news client.
 *
 * The Initial Developer of the Original Code is Netscape Communications
 * Corporation.  Portions created by Netscape are
 * Copyright (C) 1997 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */

import java.util.NoSuchElementException;
import java.util.Enumeration;

/**
 * An enumeration to return a single element.
 */
public class SingleEnumeration implements Enumeration {
  Object fElement;
  boolean fSpent;

  public SingleEnumeration(Object aElement) {
    fSpent = false;
    fElement = aElement;
  }

  public boolean hasMoreElements() {
    return !fSpent;
  }

  public Object nextElement() throws NoSuchElementException {
    if (fSpent) {
      throw new NoSuchElementException();
    }
    else {
      fSpent = true;
      return fElement;
    }
  }
}