nextapp.echo.app.util.ResizingArrayList Maven / Gradle / Ivy
/*
* This file is part of the Echo Web Application Framework (hereinafter "Echo").
* Copyright (C) 2002-2009 NextApp, Inc.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*/
package nextapp.echo.app.util;
import java.util.ArrayList;
/**
* An ArrayList based collection which automatically increases and
* decreases in size (by adding/removing trailing nulls) to allow the ability
* to invoke add() and set() methods to store
* values at indices beyond the current size of the collection.
*/
public class ResizingArrayList extends ArrayList {
/** Serial Version UID. */
private static final long serialVersionUID = 20070101L;
/**
* @see java.util.List#add(int, java.lang.Object)
*/
public void add(int i, Object o) {
while (i > size()) {
super.add(null);
}
super.add(i, o);
}
/**
* @see java.util.List#remove(int)
*/
public Object remove(int i) {
Object o = super.remove(i);
while (size() > 0 && get(size() - 1) == null) {
super.remove(size() - 1);
}
return o;
}
/**
* @see java.util.Collection#remove(java.lang.Object)
*/
public boolean remove(Object o) {
if (super.remove(o)) {
while (size() > 0 && get(size() - 1) == null) {
super.remove(size() - 1);
}
return true;
} else {
return false;
}
}
/**
* @see java.util.List#add(int, java.lang.Object)
*/
public Object set(int i, Object o) {
while (i >= size()) {
super.add(null);
}
return super.set(i, o);
}
}