22#include <QVariantList>
32 : mStatistics( stats )
44 mMinLength = std::numeric_limits<int>::max();
48 mMinority = QString();
49 mMajority = QString();
56 const auto constValues = values;
57 for (
const QString &
string : constValues )
73 testString( value.toString() );
80 mMeanLength = mSumLengths /
static_cast< double >( mCount );
84 QList<int> valueCounts = mValues.values();
88 mMinority = mValues.key( *std::min_element( valueCounts.begin(), valueCounts.end() ) );
92 mMajority = mValues.key( *std::max_element( valueCounts.begin(), valueCounts.end() ) );
101 const auto constValues = values;
102 for (
const QVariant &variant : constValues )
106 testString( variant.toString() );
113void QgsStringStatisticalSummary::testString(
const QString &
string )
117 if (
string.isEmpty() )
126 if ( !mMin.isEmpty() && !
string.isEmpty() )
128 mMin = std::min( mMin,
string );
130 else if ( mMin.isEmpty() && !
string.isEmpty() )
137 if ( !mMax.isEmpty() && !
string.isEmpty() )
139 mMax = std::max( mMax,
string );
141 else if ( mMax.isEmpty() && !
string.isEmpty() )
147 mSumLengths +=
string.length();
148 mMinLength = std::min( mMinLength,
static_cast<int>(
string.length() ) );
149 mMaxLength = std::max( mMaxLength,
static_cast<int>(
string.length() ) );
159 return mValues.count();
161 return mCountMissing;
185 res.reserve( mValues.size() );
186 for (
auto it = mValues.begin(); it != mValues.end(); ++it )
188 res.insert( it.key() );
198 return QObject::tr(
"Count" );
200 return QObject::tr(
"Count (distinct)" );
202 return QObject::tr(
"Count (missing)" );
204 return QObject::tr(
"Minimum" );
206 return QObject::tr(
"Maximum" );
208 return QObject::tr(
"Minimum length" );
210 return QObject::tr(
"Maximum length" );
212 return QObject::tr(
"Mean length" );
214 return QObject::tr(
"Minority" );
216 return QObject::tr(
"Majority" );
QFlags< StringStatistic > StringStatistics
Statistics to be calculated for string values.
StringStatistic
Available string statistics.
@ Max
Maximum string value.
@ Min
Minimum string value.
@ MaximumLength
Maximum length of string.
@ MeanLength
Mean length of strings.
@ Minority
Minority of strings.
@ CountMissing
Number of missing (null) values.
@ Majority
Majority of strings.
@ CountDistinct
Number of distinct string values.
@ MinimumLength
Minimum length of string.
QgsStringStatisticalSummary(Qgis::StringStatistics stats=Qgis::StringStatistic::All)
Constructor for QgsStringStatistics.
static QString displayName(Qgis::StringStatistic statistic)
Returns the friendly display name for a statistic.
void finalize()
Must be called after adding all strings with addString() and before retrieving any calculated string ...
void addString(const QString &string)
Adds a single string to the statistics calculation.
QSet< QString > distinctValues() const
Returns the set of distinct string values.
void addValue(const QVariant &value)
Adds a single variant to the statistics calculation.
QVariant statistic(Qgis::StringStatistic stat) const
Returns the value of a specified statistic.
void calculate(const QStringList &values)
Calculates summary statistics for an entire list of strings at once.
void calculateFromVariants(const QVariantList &values)
Calculates summary statistics for an entire list of variants at once.
void reset()
Resets the calculated values.
static bool isNull(const QVariant &variant, bool silenceNullWarnings=false)
Returns true if the specified variant should be considered a NULL value.