01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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;
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 {
52: throw new NoSuchElementException();
53: }
54:
55: }
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