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/***************************************************************************
* Copyright (C) 2012 by Peter Penz <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
#ifndef KFILEITEMMODELSORTALGORITHM_H
#define KFILEITEMMODELSORTALGORITHM_H
#include <libdolphin_export.h>
#include <kitemviews/kfileitemmodel.h>
/**
* @brief Sort algorithm for sorting items of KFileItemModel.
*
* Sorts the items by using KFileItemModel::lessThan() as comparison criteria.
* The merge sort algorithm is used to assure a worst-case
* of O(n * log(n)) and to keep the number of comparisons low.
*
* The implementation is based on qStableSortHelper() from qalgorithms.h
* Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
* The sorting implementations of qAlgorithms could not be used as they
* don't support having a member-function as comparison criteria.
*/
class LIBDOLPHINPRIVATE_EXPORT KFileItemModelSortAlgorithm
{
public:
static void sort(KFileItemModel* model,
QList<KFileItemModel::ItemData*>::iterator begin,
QList<KFileItemModel::ItemData*>::iterator end);
private:
static void merge(KFileItemModel* model,
QList<KFileItemModel::ItemData*>::iterator begin,
QList<KFileItemModel::ItemData*>::iterator pivot,
QList<KFileItemModel::ItemData*>::iterator end);
static QList<KFileItemModel::ItemData*>::iterator
lowerBound(KFileItemModel* model,
QList<KFileItemModel::ItemData*>::iterator begin,
QList<KFileItemModel::ItemData*>::iterator end,
const KFileItemModel::ItemData* value);
static QList<KFileItemModel::ItemData*>::iterator
upperBound(KFileItemModel* model,
QList<KFileItemModel::ItemData*>::iterator begin,
QList<KFileItemModel::ItemData*>::iterator end,
const KFileItemModel::ItemData* value);
static void reverse(QList<KFileItemModel::ItemData*>::iterator begin,
QList<KFileItemModel::ItemData*>::iterator end);
};
#endif
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