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-/****************************************************************************
-**
-** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the QtCore module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial Usage
-** Licensees holding valid Qt Commercial licenses may use this file in
-** accordance with the Qt Commercial License Agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Nokia.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain additional
-** rights. These rights are described in the Nokia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you have questions regarding the use of this file, please contact
-** Nokia at qt-info@nokia.com.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QTCONCURRENT_MEDIAN_H
-#define QTCONCURRENT_MEDIAN_H
-
-#include <QtCore/qglobal.h>
-
-#ifndef QT_NO_CONCURRENT
-
-#include <QtCore/qvector.h>
-#include <QtCore/qalgorithms.h>
-
-QT_BEGIN_HEADER
-QT_BEGIN_NAMESPACE
-
-QT_MODULE(Core)
-
-#ifndef qdoc
-
-namespace QtConcurrent {
-
-template <typename T>
-class Median
-{
-public:
- Median(int _bufferSize)
- : currentMedian(), bufferSize(_bufferSize), currentIndex(0), valid(false), dirty(true)
- {
- values.resize(bufferSize);
- }
-
- void reset()
- {
- values.fill(0);
- currentIndex = 0;
- valid = false;
- dirty = true;
- }
-
- void addValue(T value)
- {
- currentIndex = ((currentIndex + 1) % bufferSize);
- if (valid == false && currentIndex % bufferSize == 0)
- valid = true;
-
- // Only update the cached median value when we have to, that
- // is when the new value is on then other side of the median
- // compared to the current value at the index.
- const T currentIndexValue = values[currentIndex];
- if ((currentIndexValue > currentMedian && currentMedian > value)
- || (currentMedian > currentIndexValue && value > currentMedian)) {
- dirty = true;
- }
-
- values[currentIndex] = value;
- }
-
- bool isMedianValid() const
- {
- return valid;
- }
-
- T median()
- {
- if (dirty) {
- dirty = false;
- QVector<T> sorted = values;
- qSort(sorted);
- currentMedian = sorted.at(bufferSize / 2 + 1);
- }
- return currentMedian;
- }
-private:
- QVector<T> values;
- T currentMedian;
- int bufferSize;
- int currentIndex;
- bool valid;
- bool dirty;
-};
-
-} // namespace QtConcurrent
-
-#endif //qdoc
-
-QT_END_NAMESPACE
-QT_END_HEADER
-
-#endif // QT_NO_CONCURRENT
-
-#endif