Add method to QgsStatisticalSummary to get a short name corresponding…

… to a stat

Returns a short name, suitable for use in a field name

python/core/auto_generated/qgsstatisticalsummary.sip.in

@@ -316,9 +316,18 @@ be calculated.
 
     static QString displayName( QgsStatisticalSummary::Statistic statistic );
 %Docstring
-Returns the friendly display name for a statistic
+Returns the friendly display name for a ``statistic``.
 
-:param statistic: statistic to return name for
+.. seealso:: :py:func:`shortName`
+%End
+
+    static QString shortName( QgsStatisticalSummary::Statistic statistic );
+%Docstring
+Returns a short, friendly display name for a ``statistic``, suitable for use in a field name.
+
+.. seealso:: :py:func:`displayName`
+
+.. versionadded:: 3.6
 %End
 
 };

src/core/qgsstatisticalsummary.cpp

@@ -329,3 +329,49 @@ QString QgsStatisticalSummary::displayName( QgsStatisticalSummary::Statistic sta
   return QString();
 }
 
+QString QgsStatisticalSummary::shortName( QgsStatisticalSummary::Statistic statistic )
+{
+  switch ( statistic )
+  {
+    case Count:
+      return QStringLiteral( "count" );
+    case CountMissing:
+      return QStringLiteral( "countmissing" );
+    case Sum:
+      return QStringLiteral( "sum" );
+    case Mean:
+      return QStringLiteral( "mean" );
+    case Median:
+      return QStringLiteral( "median" );
+    case StDev:
+      return QStringLiteral( "stdev" );
+    case StDevSample:
+      return QStringLiteral( "stdevsample" );
+    case Min:
+      return QStringLiteral( "min" );
+    case Max:
+      return QStringLiteral( "max" );
+    case Range:
+      return QStringLiteral( "range" );
+    case Minority:
+      return QStringLiteral( "minority" );
+    case Majority:
+      return QStringLiteral( "majority" );
+    case Variety:
+      return QStringLiteral( "variety" );
+    case FirstQuartile:
+      return QStringLiteral( "q1" );
+    case ThirdQuartile:
+      return QStringLiteral( "q3" );
+    case InterQuartileRange:
+      return QStringLiteral( "iqr" );
+    case First:
+      return QStringLiteral( "first" );
+    case Last:
+      return QStringLiteral( "last" );
+    case All:
+      return QString();
+  }
+  return QString();
+}
+

src/core/qgsstatisticalsummary.h

@@ -286,11 +286,18 @@ class CORE_EXPORT QgsStatisticalSummary
     double interQuartileRange() const { return std::isnan( mThirdQuartile ) || std::isnan( mFirstQuartile ) ? std::numeric_limits<double>::quiet_NaN() : mThirdQuartile - mFirstQuartile; }
 
     /**
-     * Returns the friendly display name for a statistic
-     * \param statistic statistic to return name for
+     * Returns the friendly display name for a \a statistic.
+     * \see shortName()
      */
     static QString displayName( QgsStatisticalSummary::Statistic statistic );
 
+    /**
+     * Returns a short, friendly display name for a \a statistic, suitable for use in a field name.
+     * \see displayName()
+     * \since QGIS 3.6
+     */
+    static QString shortName( QgsStatisticalSummary::Statistic statistic );
+
   private:
 
     Statistics mStatistics;

tests/src/core/testqgsstatisticalsummary.cpp

@@ -36,6 +36,7 @@ class TestQgsStatisticSummary: public QObject
     void maxMin();
     void countMissing();
     void noValues();
+    void shortName();
 
   private:
 
@@ -349,5 +350,27 @@ void TestQgsStatisticSummary::noValues()
   QVERIFY( std::isnan( s.statistic( QgsStatisticalSummary::InterQuartileRange ) ) );
 }
 
+void TestQgsStatisticSummary::shortName()
+{
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Count ), QStringLiteral( "count" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::CountMissing ), QStringLiteral( "countmissing" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Sum ), QStringLiteral( "sum" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Mean ), QStringLiteral( "mean" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Median ), QStringLiteral( "median" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::StDev ), QStringLiteral( "stdev" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::StDevSample ), QStringLiteral( "stdevsample" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Min ), QStringLiteral( "min" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Max ), QStringLiteral( "max" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Range ), QStringLiteral( "range" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Minority ), QStringLiteral( "minority" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Majority ), QStringLiteral( "majority" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Variety ), QStringLiteral( "variety" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::FirstQuartile ), QStringLiteral( "q1" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::ThirdQuartile ), QStringLiteral( "q3" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::InterQuartileRange ), QStringLiteral( "iqr" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::First ), QStringLiteral( "first" ) );
+  QCOMPARE( QgsStatisticalSummary::shortName( QgsStatisticalSummary::Last ), QStringLiteral( "last" ) );
+}
+
 QGSTEST_MAIN( TestQgsStatisticSummary )
 #include "testqgsstatisticalsummary.moc"