Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ReaderCharIterator |
|
| 2.0;2 |
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 | package org.apache.commons.collections.primitives.adapters.io; | |
18 | ||
19 | import java.io.IOException; | |
20 | import java.io.Reader; | |
21 | import java.util.NoSuchElementException; | |
22 | ||
23 | import org.apache.commons.collections.primitives.CharIterator; | |
24 | ||
25 | /** | |
26 | * Adapts a {@link Reader} to the {@link CharIterator} interface. | |
27 | * | |
28 | * @version $Revision: 480462 $ $Date: 2006-11-29 03:15:00 -0500 (Wed, 29 Nov 2006) $ | |
29 | * @author Rodney Waldhoff | |
30 | */ | |
31 | public class ReaderCharIterator implements CharIterator { | |
32 | ||
33 | 17 | public ReaderCharIterator(Reader in) { |
34 | 17 | this.reader = in; |
35 | 17 | } |
36 | ||
37 | public static CharIterator adapt(Reader in) { | |
38 | 2 | return null == in ? null : new ReaderCharIterator(in); |
39 | } | |
40 | ||
41 | public boolean hasNext() { | |
42 | 193 | ensureNextAvailable(); |
43 | 191 | return (-1 != next); |
44 | } | |
45 | ||
46 | public char next() { | |
47 | 96 | if(!hasNext()) { |
48 | 3 | throw new NoSuchElementException("No next element"); |
49 | } else { | |
50 | 92 | nextAvailable = false; |
51 | 92 | return (char)next; |
52 | } | |
53 | } | |
54 | ||
55 | /** | |
56 | * Not supported. | |
57 | * @throws UnsupportedOperationException | |
58 | */ | |
59 | public void remove() throws UnsupportedOperationException { | |
60 | 1 | throw new UnsupportedOperationException("remove() is not supported here"); |
61 | } | |
62 | ||
63 | private void ensureNextAvailable() { | |
64 | 193 | if(!nextAvailable) { |
65 | 99 | readNext(); |
66 | } | |
67 | 191 | } |
68 | ||
69 | private void readNext() { | |
70 | try { | |
71 | 99 | next = reader.read(); |
72 | 97 | nextAvailable = true; |
73 | 2 | } catch(IOException e) { |
74 | // TODO: Use a tunnelled exception instead? | |
75 | // See http://radio.weblogs.com/0122027/2003/04/01.html#a7, for example | |
76 | 2 | throw new RuntimeException(e.toString()); |
77 | 97 | } |
78 | 97 | } |
79 | ||
80 | 17 | private Reader reader = null; |
81 | 17 | private boolean nextAvailable = false; |
82 | private int next; | |
83 | ||
84 | } |