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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one
    3    * or more contributor license agreements.  See the NOTICE file
    4    * distributed with this work for additional information
    5    * regarding copyright ownership.  The ASF licenses this file
    6    * to you under the Apache License, Version 2.0 (the
    7    * "License"); you may not use this file except in compliance
    8    * with the License.  You may obtain a copy of the License at
    9    *
    10   *   http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing,
    13   * software distributed under the License is distributed on an
    14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   * KIND, either express or implied.  See the License for the
    16   * specific language governing permissions and limitations
    17   * under the License.
    18   */
    19  package org.apache.myfaces.shared_orchestra.util;
    20
    21  import java.util.Iterator;
    22  import java.util.NoSuchElementException;
    23
    24
    25  /**
    26   * Iterator without elements
    27   *
    28   * @author Anton Koinov (latest modification by $Author: grantsmith $)
    29   * @version $Revision: 472630 $ $Date: 2006-11-08 15:40:03 -0500 (Wed, 08 Nov 2006) $
    30   */
    31  public final class NullIterator implements Iterator
    32  {
    33      //~ Static fields/initializers -----------------------------------------------------------------
    34
    35      private static final NullIterator INSTANCE = new NullIterator();
    36
    37      //~ Methods ------------------------------------------------------------------------------------
    38
    39      public static final Iterator instance()
    40      {
    41          return INSTANCE;
    42      }
    43
    44      public boolean hasNext()
    45      {
    46          return false;
    47      }
    48
    49      public Object next()
    50      {
    51          throw new NoSuchElementException();
    52      }
    53
    54      public void remove()
    55      {
    56          throw new UnsupportedOperationException(this.getClass().getName() + " UnsupportedOperationException");
    57      }
    58  }