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 }