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Java > Open Source Codes > org > apache > commons > collections > iterators > EmptyIterator


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.commons.collections.iterators;
17
18 import java.util.Iterator JavaDoc;
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: 1.1 $ $Date: 2004/05/22 09:46:39 $
31  *
32  * @author Stephen Colebourne
33  */
34 public class EmptyIterator extends AbstractEmptyIterator implements ResettableIterator {
35
36     /**
37      * Singleton instance of the iterator.
38      * @since Commons Collections 3.1
39      */
40     public static final ResettableIterator RESETTABLE_INSTANCE = new EmptyIterator();
41     /**
42      * Singleton instance of the iterator.
43      * @since Commons Collections 2.1.1 and 3.1
44      */
45     public static final Iterator JavaDoc INSTANCE = RESETTABLE_INSTANCE;
46
47     /**
48      * Constructor.
49      */
50     protected EmptyIterator() {
51         super();
52     }
53
54 }
55
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