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/* arraylist.vala
*
* Copyright (C) 2004-2005 Novell, Inc
* Copyright (C) 2005 David Waite
* Copyright (C) 2007-2008 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* Arrays of arbitrary elements which grow automatically as elements are added.
*/
public class Vala.ArrayList<G> : List<G> {
public override int size {
get { return _size; }
}
public EqualFunc<G> equal_func {
set { _equal_func = value; }
}
internal G[] _items = new G[4];
internal int _size;
private EqualFunc<G> _equal_func;
// concurrent modification protection
private int _stamp = 0;
public ArrayList (EqualFunc<G> equal_func = GLib.direct_equal) {
this.equal_func = equal_func;
}
public override Type get_element_type () {
return typeof (G);
}
public override Vala.Iterator<G> iterator () {
return new Iterator<G> (this);
}
public override bool contains (G item) {
return (index_of (item) != -1);
}
public override int index_of (G item) {
for (int index = 0; index < _size; index++) {
if (_equal_func (_items[index], item)) {
return index;
}
}
return -1;
}
public override G? get (int index) {
assert (index >= 0 && index < _size);
return _items[index];
}
public override void set (int index, G item) {
assert (index >= 0 && index < _size);
_items[index] = item;
}
public override bool add (G item) {
if (_size == _items.length) {
grow_if_needed (1);
}
_items[_size++] = item;
_stamp++;
return true;
}
public override void insert (int index, G item) {
assert (index >= 0 && index <= _size);
if (_size == _items.length) {
grow_if_needed (1);
}
shift (index, 1);
_items[index] = item;
_stamp++;
}
public override bool remove (G item) {
for (int index = 0; index < _size; index++) {
if (_equal_func (_items[index], item)) {
remove_at (index);
return true;
}
}
return false;
}
public override G remove_at (int index) {
assert (index >= 0 && index < _size);
G item = _items[index];
_items[index] = null;
shift (index + 1, -1);
_stamp++;
return item;
}
public override void clear () {
for (int index = 0; index < _size; index++) {
_items[index] = null;
}
_size = 0;
_stamp++;
}
private void shift (int start, int delta) {
assert (start >= 0 && start <= _size && start >= -delta);
_items.move (start, start + delta, _size - start);
_size += delta;
}
private void grow_if_needed (int new_count) {
assert (new_count >= 0);
int minimum_size = _size + new_count;
if (minimum_size > _items.length) {
// double the capacity unless we add even more items at this time
set_capacity (new_count > _items.length ? minimum_size : 2 * _items.length);
}
}
private void set_capacity (int value) {
assert (value >= _size);
_items.resize (value);
}
private class Iterator<G> : Vala.Iterator<G> {
public ArrayList<G> list {
set {
_list = value;
_stamp = _list._stamp;
}
}
private ArrayList<G> _list;
private int _index = -1;
protected bool _removed = false;
// concurrent modification protection
public int _stamp = 0;
public Iterator (ArrayList<G> list) {
this.list = list;
}
public override bool next () {
assert (_stamp == _list._stamp);
if (_index < _list._size) {
_index++;
_removed = false;
}
return (_index < _list._size);
}
public override bool has_next () {
assert (_stamp == _list._stamp);
return (_index + 1 < _list._size);
}
public override G? get () {
assert (_stamp == _list._stamp);
assert (! _removed);
if (_index < 0 || _index >= _list._size) {
return null;
}
return _list.get (_index);
}
public override void remove () {
assert (_stamp == _list._stamp);
assert (! _removed && _index >= 0);
assert (_index < _list._size);
_list.remove_at (_index);
_index--;
_removed = true;
_stamp = _list._stamp;
}
public override bool valid {
get {
return _index >= 0 && _index < _list._size && ! _removed;
}
}
}
}
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