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Java > Open Source Codes > org > apache > fop > fo > NullCharIterator


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 /* $Id: NullCharIterator.java 426576 2006-07-28 15:44:37Z jeremias $ */
19
20 package org.apache.fop.fo;
21
22 import java.util.NoSuchElementException JavaDoc;
23
24 /**
25  * Class providing an iterator for zero characters. Used by the Block FO.
26  */
27 public class NullCharIterator extends CharIterator {
28
29     private static CharIterator instance;
30     
31     public static CharIterator getInstance() {
32         if (instance == null) {
33             instance = new NullCharIterator();
34         }
35         return instance;
36     }
37
38     /**
39      * Constructor
40      */
41     public NullCharIterator() {
42         //nop
43 }
44
45     /** @see java.util.Iterator#hasNext() */
46     public boolean hasNext() {
47         return false;
48     }
49
50     /** @see org.apache.fop.fo.CharIterator#nextChar() */
51     public char nextChar() throws NoSuchElementException JavaDoc {
52         throw new NoSuchElementException JavaDoc();
53     }
54
55 }
56
57
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