Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
SingletonList |
|
| 2.0;2 |
1 | /* | |
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/util/SingletonList.java,v 1.4 2006/11/09 16:39:19 elharo Exp $ | |
3 | * $Revision: 1.4 $ | |
4 | * $Date: 2006/11/09 16:39:19 $ | |
5 | * | |
6 | * ==================================================================== | |
7 | * | |
8 | * Copyright 2000-2002 bob mcwhirter & James Strachan. | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions are | |
13 | * met: | |
14 | * | |
15 | * * Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * | |
18 | * * Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * | |
22 | * * Neither the name of the Jaxen Project nor the names of its | |
23 | * contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
27 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
28 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A | |
29 | * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER | |
30 | * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
31 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
32 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
33 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
34 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
35 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
36 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
37 | * | |
38 | * ==================================================================== | |
39 | * This software consists of voluntary contributions made by many | |
40 | * individuals on behalf of the Jaxen Project and was originally | |
41 | * created by bob mcwhirter <bob@werken.com> and | |
42 | * James Strachan <jstrachan@apache.org>. For more information on the | |
43 | * Jaxen Project, please see <http://www.jaxen.org/>. | |
44 | * | |
45 | * $Id: SingletonList.java,v 1.4 2006/11/09 16:39:19 elharo Exp $ | |
46 | */ | |
47 | ||
48 | ||
49 | ||
50 | package org.jaxen.util; | |
51 | ||
52 | import java.util.AbstractList; | |
53 | ||
54 | /** | |
55 | * A utility class that implements singleton lists | |
56 | * (to avoid dependency on JDK 1.3). Many operations | |
57 | * including <code>add()</code> and <code>remove()</code> throw | |
58 | * UnsupportedOperationExceptions. | |
59 | * | |
60 | * @version 1.2b12 | |
61 | * @author Attila Szegedi | |
62 | * | |
63 | */ | |
64 | public class SingletonList extends AbstractList { | |
65 | ||
66 | private final Object element; | |
67 | ||
68 | /** | |
69 | * Creates a new singleton list. | |
70 | * | |
71 | * @param element the single member of the list | |
72 | */ | |
73 | 8600 | public SingletonList(Object element) { |
74 | 8600 | this.element = element; |
75 | 8600 | } |
76 | ||
77 | /** | |
78 | * Returns 1. | |
79 | * | |
80 | * @return 1 | |
81 | */ | |
82 | public int size() { | |
83 | 16096 | return 1; |
84 | } | |
85 | ||
86 | /** | |
87 | * Returns the single element in the list. | |
88 | * | |
89 | * @return the only element in the list | |
90 | * | |
91 | * @throws IndexOutOfBoundsException if index is not 0 | |
92 | * | |
93 | */ | |
94 | public Object get(int index) { | |
95 | 6632 | if(index == 0) { |
96 | 6630 | return element; |
97 | } | |
98 | 2 | throw new IndexOutOfBoundsException(index + " != 0"); |
99 | } | |
100 | ||
101 | } |