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1   /*
2    * Copyright 2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.portals.bridges.jsf;
17  
18  import java.util.Iterator;
19  import java.util.NoSuchElementException;
20  
21  /***
22   * <p>
23   * Iterator without elements.
24   * </p>
25   * <p>
26   * Code borrowed from myfaces.
27   * </p>
28   */
29  public final class NullIterator implements Iterator
30  {
31      private static final NullIterator INSTANCE = new NullIterator();
32  
33      public static final Iterator instance()
34      {
35          return INSTANCE;
36      }
37  
38      public boolean hasNext()
39      {
40          return false;
41      }
42  
43      public Object next()
44      {
45          throw new NoSuchElementException();
46      }
47  
48      public void remove()
49      {
50          throw new UnsupportedOperationException(this.getClass().getName() + " UnsupportedOperationException");
51      }
52  }