| EmptyIterator.java |
1 /**
2 * Distribution License:
3 * JSword is free software; you can redistribute it and/or modify it under
4 * the terms of the GNU Lesser General Public License, version 2.1 or later
5 * as published by the Free Software Foundation. This program is distributed
6 * in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
7 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
8 * See the GNU Lesser General Public License for more details.
9 *
10 * The License is available on the internet at:
11 * http://www.gnu.org/copyleft/lgpl.html
12 * or by writing to:
13 * Free Software Foundation, Inc.
14 * 59 Temple Place - Suite 330
15 * Boston, MA 02111-1307, USA
16 *
17 * © CrossWire Bible Society, 2005 - 2016
18 *
19 */
20 package org.crosswire.common.util;
21
22 import java.util.Iterator;
23 import java.util.NoSuchElementException;
24
25 /**
26 * An <code>EmptyIterator</code> is an <code>Iterator</code> that iterates over
27 * nothing.
28 *
29 * @param <E> The type of the element that this empty iterator will never return.
30 * @see gnu.lgpl.License The GNU Lesser General Public License for details.
31 * @author DM Smith
32 */
33 public class EmptyIterator<E> implements Iterator<E> {
34
35 /**
36 * Construct an <code>EmptyIterator</code>.
37 */
38 public EmptyIterator() {
39 }
40
41 /* (non-Javadoc)
42 * @see java.util.Iterator#remove()
43 */
44 public void remove() {
45 throw new UnsupportedOperationException();
46 }
47
48 /* (non-Javadoc)
49 * @see java.util.Iterator#hasNext()
50 */
51 public boolean hasNext() {
52 return false;
53 }
54
55 /* (non-Javadoc)
56 * @see java.util.Iterator#next()
57 */
58 public E next() {
59 throw new NoSuchElementException();
60 }
61
62 }
63