qgsdatetimestatisticalsummary.h

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/***************************************************************************
  qgsdatetimestatisticalsummary.h
  -------------------------------
  Date                 : May 2016
  Copyright            : (C) 2016 by Nyall Dawson
  Email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSDATETIMESTATISTICALSUMMARY_H
#define QGSDATETIMESTATISTICALSUMMARY_H
 
#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgsinterval.h"
#include <QSet>
#include <QDateTime>
#include <QVariantList>
 
/***************************************************************************
 * This class is considered CRITICAL and any change MUST be accompanied with
 * full unit tests in test_qgsdatetimestatisticalsummary.py.
 * See details in QEP #17
 ****************************************************************************/
 
class CORE_EXPORT QgsDateTimeStatisticalSummary
{
  public:
 
    enum Statistic
    {
      Count = 1,  
      CountDistinct = 2,  
      CountMissing = 4,  
      Min = 8, 
      Max = 16, 
      Range = 32, 
      All = Count | CountDistinct | CountMissing | Min | Max | Range, 
    };
    Q_DECLARE_FLAGS( Statistics, Statistic )
 
    
    QgsDateTimeStatisticalSummary( QgsDateTimeStatisticalSummary::Statistics stats = All );
 
    Statistics statistics() const { return mStatistics; }
 
    void setStatistics( Statistics stats ) { mStatistics = stats; }
 
    void reset();
 
    void calculate( const QVariantList &values );
 
    void addValue( const QVariant &value );
 
    void finalize();
 
    QVariant statistic( QgsDateTimeStatisticalSummary::Statistic stat ) const;
 
    int count() const { return mCount; }
 
    int countDistinct() const { return mValues.count(); }
 
    QSet< QDateTime > distinctValues() const { return mValues; }
 
    int countMissing() const { return mCountMissing; }
 
    QDateTime min() const { return mMin; }
 
    QDateTime max() const { return mMax; }
 
    QgsInterval range() const { return mMax - mMin; }
 
    static QString displayName( QgsDateTimeStatisticalSummary::Statistic statistic );
 
  private:
 
    Statistics mStatistics;
 
    int mCount;
    QSet< QDateTime > mValues;
    int mCountMissing;
    QDateTime mMin;
    QDateTime mMax;
    bool mIsTimes;
 
    void testDateTime( const QDateTime &dateTime, bool isNull );
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS( QgsDateTimeStatisticalSummary::Statistics )
 
#endif // QGSDATETIMESTATISTICALSUMMARY_H