01: /*
02: * Copyright 2004 The Apache Software Foundation
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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.commons.collections.iterators;
17:
18: import java.util.Iterator;
19:
20: import org.apache.commons.collections.ResettableIterator;
21:
22: /**
23: * Provides an implementation of an empty iterator.
24: * <p>
25: * This class provides an implementation of an empty iterator.
26: * This class provides for binary compatability between Commons Collections
27: * 2.1.1 and 3.1 due to issues with <code>IteratorUtils</code>.
28: *
29: * @since Commons Collections 2.1.1 and 3.1
30: * @version $Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
31: *
32: * @author Stephen Colebourne
33: */
34: public class EmptyIterator extends AbstractEmptyIterator implements
35: ResettableIterator {
36:
37: /**
38: * Singleton instance of the iterator.
39: * @since Commons Collections 3.1
40: */
41: public static final ResettableIterator RESETTABLE_INSTANCE = new EmptyIterator();
42: /**
43: * Singleton instance of the iterator.
44: * @since Commons Collections 2.1.1 and 3.1
45: */
46: public static final Iterator INSTANCE = RESETTABLE_INSTANCE;
47:
48: /**
49: * Constructor.
50: */
51: protected EmptyIterator() {
52: super();
53: }
54:
55: }
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