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    1   package org.jaxen;
    2
    3   /*
    4    * $Header: $
    5    * $Revision: $
    6    * $Date: $
    7    *
    8    * ====================================================================
    9    *
    10   * Copyright (C) 2000-2005 bob mcwhirter & James Strachan.
    11   * All rights reserved.
    12   *
    13   * Redistribution and use in source and binary forms, with or without
    14   * modification, are permitted provided that the following conditions
    15   * are met:
    16   *
    17   * 1. Redistributions of source code must retain the above copyright
    18   *    notice, this list of conditions, and the following disclaimer.
    19   *
    20   * 2. Redistributions in binary form must reproduce the above copyright
    21   *    notice, this list of conditions, and the disclaimer that follows
    22   *    these conditions in the documentation and/or other materials
    23   *    provided with the distribution.
    24   *
    25   * 3. The name "Jaxen" must not be used to endorse or promote products
    26   *    derived from this software without prior written permission.  For
    27   *    written permission, please contact license@jaxen.org.
    28   *
    29   * 4. Products derived from this software may not be called "Jaxen", nor
    30   *    may "Jaxen" appear in their name, without prior written permission
    31   *    from the Jaxen Project Management (pm@jaxen.org).
    32   *
    33   * In addition, we request (but do not require) that you include in the
    34   * end-user documentation provided with the redistribution and/or in the
    35   * software itself an acknowledgement equivalent to the following:
    36   *     "This product includes software developed by the
    37   *      Jaxen Project <http://www.jaxen.org/>."
    38   * Alternatively, the acknowledgment may be graphical using the logos
    39   * available at http://www.jaxen.org/
    40   *
    41   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    42   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    43   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    44   * DISCLAIMED.  IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
    45   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    46   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    47   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    48   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    49   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    50   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    51   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    52   * SUCH DAMAGE.
    53   *
    54   * ====================================================================
    55   * This software consists of voluntary contributions made by many
    56   * individuals on behalf of the Jaxen Project and was originally
    57   * created by bob mcwhirter <bob@werken.com> and
    58   * James Strachan <jstrachan@apache.org>.  For more information on the
    59   * Jaxen Project, please see <http://www.jaxen.org/>.
    60   *
    61   * $Id: $
    62  */
    63
    64  import java.util.Collections;
    65  import java.util.Iterator;
    66  import java.util.ListIterator;
    67
    68  /***
    69   * Thread-safe constant iterators used to avoid the overhead of creating
    70   * empty lists.
    71   */
    72  public class JaxenConstants
    73  {
    74
    75      private JaxenConstants() {}
    76
    77      /***
    78       * An iterator with no elements. <code>hasNext()</code> always
    79       * returns false. This is thread-safe.
    80       */
    81      public static final Iterator EMPTY_ITERATOR = Collections.EMPTY_LIST.iterator();
    82
    83      /***
    84       * A list iterator with no elements. <code>hasNext()</code> always
    85       * returns false. This is thread-safe.
    86       */
    87      public static final ListIterator EMPTY_LIST_ITERATOR = Collections.EMPTY_LIST.listIterator();
    88
    89  }