01: /* ***** BEGIN LICENSE BLOCK *****
02: * Version: MPL 1.1
03: * The contents of this file are subject to the Mozilla Public License Version
04: * 1.1 (the "License"); you may not use this file except in compliance with
05: * the License. You may obtain a copy of the License at
06: * http://www.mozilla.org/MPL/
07: *
08: * Software distributed under the License is distributed on an "AS IS" basis,
09: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10: * for the specific language governing rights and limitations under the
11: * License.
12: *
13: * The Original Code is Riot.
14: *
15: * The Initial Developer of the Original Code is
16: * Neteye GmbH.
17: * Portions created by the Initial Developer are Copyright (C) 2006
18: * the Initial Developer. All Rights Reserved.
19: *
20: * Contributor(s):
21: * Felix Gnass [fgnass at neteye dot de]
22: *
23: * ***** END LICENSE BLOCK ***** */
24: package org.riotfamily.common.collection;
25:
26: import java.util.Iterator;
27: import java.util.NoSuchElementException;
28:
29: /**
30: * An iterator with no elements.
31: */
32: public class EmptyIterator implements Iterator {
33:
34: public static final Iterator INSTANCE = new EmptyIterator();
35:
36: protected EmptyIterator() {
37: }
38:
39: public boolean hasNext() {
40: return false;
41: }
42:
43: public Object next() {
44: throw new NoSuchElementException(
45: "Iterator contains no elements");
46: }
47:
48: public void remove() {
49: throw new UnsupportedOperationException();
50: }
51:
52: }
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