mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-26 00:02:08 -05:00
122 lines
3.6 KiB
Plaintext
122 lines
3.6 KiB
Plaintext
/** \ingroup core
|
|
* \class QgsStringStatisticalSummary
|
|
* \brief Calculator for summary statistics and aggregates for a list of strings.
|
|
*
|
|
* Statistics are calculated by calling @link calculate @endlink and passing a list of strings. The
|
|
* individual statistics can then be retrieved using the associated methods. Note that not all statistics
|
|
* are calculated by default. Statistics which require slower computations are only calculated by
|
|
* specifying the statistic in the constructor or via @link setStatistics @endlink.
|
|
*
|
|
* \note Added in version 2.16
|
|
*/
|
|
|
|
|
|
class QgsStringStatisticalSummary
|
|
{
|
|
%TypeHeaderCode
|
|
#include <qgsstringstatisticalsummary.h>
|
|
%End
|
|
|
|
public:
|
|
|
|
public:
|
|
|
|
//! Enumeration of flags that specify statistics to be calculated
|
|
enum Statistic
|
|
{
|
|
Count, //!< Count
|
|
CountDistinct, //!< Number of distinct string values
|
|
CountMissing, //!< Number of missing (null) values
|
|
Min, //!< Minimum string value
|
|
Max, //!< Maximum string value
|
|
MinimumLength, //!< Minimum length of string
|
|
MaximumLength, //!< Maximum length of string
|
|
All, //! All statistics
|
|
};
|
|
typedef QFlags<QgsStringStatisticalSummary::Statistic> Statistics;
|
|
|
|
/** Constructor for QgsStringStatistics
|
|
* @param stats flags for statistics to calculate
|
|
*/
|
|
QgsStringStatisticalSummary( const QgsStringStatisticalSummary::Statistics& stats = All );
|
|
|
|
/** Returns flags which specify which statistics will be calculated. Some statistics
|
|
* are always calculated (eg count).
|
|
* @see setStatistics
|
|
*/
|
|
Statistics statistics() const;
|
|
|
|
/** Sets flags which specify which statistics will be calculated. Some statistics
|
|
* are always calculated (eg count).
|
|
* @param stats flags for statistics to calculate
|
|
* @see statistics
|
|
*/
|
|
void setStatistics( const Statistics& stats );
|
|
|
|
/** Resets the calculated values
|
|
*/
|
|
void reset();
|
|
|
|
/** Calculates summary statistics for a list of strings.
|
|
* @param values list of strings
|
|
* @see calculateFromVariants()
|
|
*/
|
|
void calculate( const QStringList& values );
|
|
|
|
/** Calculates summary statistics for a list of variants. Any non-string variants will be
|
|
* ignored.
|
|
* @param values list of variants
|
|
* @see calculate()
|
|
*/
|
|
void calculateFromVariants( const QVariantList& values );
|
|
|
|
/** Returns the value of a specified statistic
|
|
* @param stat statistic to return
|
|
* @returns calculated value of statistic
|
|
*/
|
|
QVariant statistic( Statistic stat ) const;
|
|
|
|
/** Returns the calculated count of values.
|
|
*/
|
|
int count() const;
|
|
|
|
/** Returns the number of distinct string values.
|
|
* @see distinctValues()
|
|
*/
|
|
int countDistinct() const;
|
|
|
|
/** Returns the set of distinct string values.
|
|
* @see countDistinct()
|
|
*/
|
|
QSet< QString > distinctValues() const;
|
|
|
|
/** Returns the number of missing (null) string values.
|
|
*/
|
|
int countMissing() const;
|
|
|
|
/** Returns the minimum (non-null) string value.
|
|
*/
|
|
QString min() const;
|
|
|
|
/** Returns the maximum (non-null) string value.
|
|
*/
|
|
QString max() const;
|
|
|
|
/** Returns the minimum length of strings.
|
|
*/
|
|
int minLength() const;
|
|
|
|
/** Returns the maximum length of strings.
|
|
*/
|
|
int maxLength() const;
|
|
|
|
/** Returns the friendly display name for a statistic
|
|
* @param statistic statistic to return name for
|
|
*/
|
|
static QString displayName( Statistic statistic );
|
|
|
|
};
|
|
|
|
QFlags<QgsStringStatisticalSummary::Statistic> operator|(QgsStringStatisticalSummary::Statistic f1, QFlags<QgsStringStatisticalSummary::Statistic> f2);
|
|
|