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Java > Open Source Codes > nextapp > echo2 > app > util > ResizingArrayList


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.app.util;
31
32 import java.util.ArrayList JavaDoc;
33
34 /**
35  * An <code>ArrayList</code> based collection which automatically increases and
36  * decreases in size (by adding/removing trailing nulls) to allow the ability
37  * to invoke <code>add()</code> and <code>set()</code> methods to store
38  * values at indices beyond the current size of the collection.
39  */
40 public class ResizingArrayList extends ArrayList JavaDoc {
41
42     /**
43      * @see java.util.List#add(int, java.lang.Object)
44      */
45     public void add(int i, Object JavaDoc o) {
46         while (i > size()) {
47             super.add(null);
48         }
49         super.add(i, o);
50     }
51     
52     /**
53      * @see java.util.List#remove(int)
54      */
55     public Object JavaDoc remove(int i) {
56         Object JavaDoc o = super.remove(i);
57         while (size() > 0 && get(size() - 1) == null) {
58             super.remove(size() - 1);
59         }
60         return o;
61     }
62     
63     /**
64      * @see java.util.Collection#remove(java.lang.Object)
65      */
66     public boolean remove(Object JavaDoc o) {
67         if (super.remove(o)) {
68             while (size() > 0 && get(size() - 1) == null) {
69                 super.remove(size() - 1);
70             }
71             return true;
72         } else {
73             return false;
74         }
75     }
76
77     /**
78      * @see java.util.List#add(int, java.lang.Object)
79      */
80     public Object JavaDoc set(int i, Object JavaDoc o) {
81         while (i >= size()) {
82             super.add(null);
83         }
84         return super.set(i, o);
85     }
86 }
87
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