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 1617052 2014-08-10 06:55:01Z gadams $ */
19 
20 package org.apache.fop.fo;
21 
22 import java.util.NoSuchElementException;
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 = new NullCharIterator();
30 
31     /**
32      * Obtain the singleton instance of the null character iterator.
33      * @return the char iterator
34      */
getInstance()35     public static CharIterator getInstance() {
36         return instance;
37     }
38 
39     /**
40      * Constructor
41      */
NullCharIterator()42     public NullCharIterator() {
43         //nop
44     }
45 
46     /** {@inheritDoc} */
hasNext()47     public boolean hasNext() {
48         return false;
49     }
50 
51     /** {@inheritDoc} */
nextChar()52     public char nextChar() throws NoSuchElementException {
53         throw new NoSuchElementException();
54     }
55 
56 }
57 
58