BooleanPossibleRawEnumeration.java

/*
 * $Source$
 * $Revision$
 *
 * Copyright (C) 2008 Tim Pizey
 *
 * Part of Melati (http://melati.org), a framework for the rapid
 * development of clean, maintainable web applications.
 *
 * Melati is free software; Permission is granted to copy, distribute
 * and/or modify this software under the terms either:
 *
 * a) the GNU General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version,
 *
 *    or
 *
 * b) any version of the Melati Software License, as published
 *    at http://melati.org
 *
 * You should have received a copy of the GNU General Public License and
 * the Melati Software License along with this program;
 * if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
 * GNU General Public License and visit http://melati.org to obtain the
 * Melati Software License.
 *
 * Feel free to contact the Developers of Melati (http://melati.org),
 * if you would like to work out a different arrangement than the options
 * outlined here.  It is our intention to allow Melati to be used by as
 * wide an audience as possible.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Contact details for copyright holder:
 *
 *     Tim Pizey <timp At paneris.org>
 *     http://paneris.org/~timp
 */

package org.melati.poem;

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

/**
 * The possible raw values of a {@link BooleanPoemType}.
 * @author timp
 * @since 18 April 2008
 *
 */
public 
class BooleanPossibleRawEnumeration implements Enumeration<Boolean> {
  private int state = 0;

  /**
   * {@inheritDoc}
   * @see java.util.Enumeration#hasMoreElements()
   */
  public boolean hasMoreElements() {
    return state < 2;
  }

  /**
   * {@inheritDoc}
   * @see java.util.Enumeration#nextElement()
   */
  public synchronized Boolean nextElement() {
    if (state == 2)
      throw new NoSuchElementException();
    else 
      // Perfectly good, but the only usage I have ever seen.
      // return state++ == 0 ? Boolean.FALSE : Boolean.TRUE;
      return ++state == 1 ? Boolean.FALSE : Boolean.TRUE;
  }

}