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-/* mergesort.vala
- *
- * Copyright (C) 2009 Didier Villevalois
- *
- * 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:
- * Will <tcosprojects@gmail.com>
- */
-
-internal class Gee.MergeSort<G> {
-
- public static void sort<G> (List<G> list, CompareFunc compare) {
- if (list is ArrayList) {
- MergeSort.sort_arraylist<G> ((ArrayList<G>) list, compare);
- } else {
- MergeSort.sort_list<G> (list, compare);
- }
- }
-
- public static void sort_list<G> (List<G> list, CompareFunc compare) {
- MergeSort<G> helper = new MergeSort<G> ();
-
- helper.list_collection = list;
- helper.array = list.to_array ();
- helper.list = helper.array;
- helper.index = 0;
- helper.size = list.size;
- helper.compare = compare;
-
- helper.do_sort ();
-
- // TODO Use a list iterator and use iter.set(item)
- list.clear ();
- foreach (G item in helper.array) {
- list.add (item);
- }
- }
-
- public static void sort_arraylist<G> (ArrayList<G> list, CompareFunc compare) {
- MergeSort<G> helper = new MergeSort<G> ();
-
- helper.list_collection = list;
- helper.list = list._items;
- helper.index = 0;
- helper.size = list._size;
- helper.compare = compare;
-
- helper.do_sort ();
- }
-
- private List<G> list_collection;
- private G[] array;
- private unowned G[] list;
- private int index;
- private int size;
- private CompareFunc compare;
-
- private void do_sort () {
- if (this.size <= 1) {
- return;
- }
-
- var work_area = new G[this.size];
-
- merge_sort_aux (index, this.size, work_area);
- }
-
- private void merge_sort_aux (int left, int right, G[] work_area) {
- if (right == left + 1) {
- return;
- } else {
- int size = right - left;
- int middle = size / 2;
- int lbegin = left;
- int rbegin = left + middle;
-
- merge_sort_aux (left, left + middle, work_area);
- merge_sort_aux (left + middle, right, work_area);
-
- for (int i = 0; i < size; i++) {
- if (lbegin < left + middle && (rbegin == right ||
- compare (list[lbegin], list[rbegin]) <= 0)) {
-
- work_area[i] = list[lbegin];
- lbegin++;
- } else {
- work_area[i] = list[rbegin];
- rbegin++;
- }
- }
-
- for (int i = left; i < right; i++) {
- list[i] = work_area[i - left];
- }
- }
- }
-}