01: /*
02: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
03: * Copyright (C) 2002-2005 NextApp, Inc.
04: *
05: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
06: *
07: * The contents of this file are subject to the Mozilla Public License Version
08: * 1.1 (the "License"); you may not use this file except in compliance with
09: * 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;
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 {
41:
42: /**
43: * @see java.util.List#add(int, java.lang.Object)
44: */
45: public void add(int i, Object 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 remove(int i) {
56: Object 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 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 set(int i, Object o) {
81: while (i >= size()) {
82: super.add(null);
83: }
84: return super.set(i, o);
85: }
86: }
|