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qgsexpression.cpp
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qgsexpression.cpp
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/***************************************************************************
qgsexpression.cpp
-------------------
begin : August 2011
copyright : (C) 2011 Martin Dobias
email : wonder.sk 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. *
* *
***************************************************************************/
#include "qgsexpression.h"
#include "qgsrelationmanager.h"
#include <QtDebug>
#include <QDomDocument>
#include <QDate>
#include <QRegExp>
#include <QColor>
#include <QUuid>
#include <QMutex>
#include <math.h>
#include <limits>
#include "qgsdistancearea.h"
#include "qgsfeature.h"
#include "qgsfeatureiterator.h"
#include "qgsgeometry.h"
#include "qgsgeometryengine.h"
#include "qgsgeometryutils.h"
#include "qgslogger.h"
#include "qgsmaplayerregistry.h"
#include "qgsogcutils.h"
#include "qgsvectorlayer.h"
#include "qgssymbollayerutils.h"
#include "qgscolorramp.h"
#include "qgsstyle.h"
#include "qgsexpressioncontext.h"
#include "qgsproject.h"
#include "qgsstringutils.h"
#include "qgsgeometrycollection.h"
#include "qgspointv2.h"
#include "qgspolygon.h"
#include "qgsmultipoint.h"
#include "qgsmultilinestring.h"
#include "qgscurvepolygon.h"
#include "qgsexpressionprivate.h"
#include "qgsexpressionsorter.h"
#include "qgsmaptopixelgeometrysimplifier.h"
#include "qgsmessagelog.h"
#include "qgscsexception.h"
// from parser
extern QgsExpression::Node* parseExpression( const QString& str, QString& parserErrorMsg );
///////////////////////////////////////////////
// three-value logic
enum TVL
{
False,
True,
Unknown
};
static TVL AND[3][3] =
{
// false true unknown
{ False, False, False }, // false
{ False, True, Unknown }, // true
{ False, Unknown, Unknown } // unknown
};
static TVL OR[3][3] =
{
{ False, True, Unknown }, // false
{ True, True, True }, // true
{ Unknown, True, Unknown } // unknown
};
static TVL NOT[3] = { True, False, Unknown };
static QVariant tvl2variant( TVL v )
{
switch ( v )
{
case False:
return 0;
case True:
return 1;
case Unknown:
default:
return QVariant();
}
}
#define TVL_True QVariant(1)
#define TVL_False QVariant(0)
#define TVL_Unknown QVariant()
///////////////////////////////////////////////
// QVariant checks and conversions
inline bool isIntSafe( const QVariant& v )
{
if ( v.type() == QVariant::Int ) return true;
if ( v.type() == QVariant::UInt ) return true;
if ( v.type() == QVariant::LongLong ) return true;
if ( v.type() == QVariant::ULongLong ) return true;
if ( v.type() == QVariant::Double ) return false;
if ( v.type() == QVariant::String ) { bool ok; v.toString().toInt( &ok ); return ok; }
return false;
}
inline bool isDoubleSafe( const QVariant& v )
{
if ( v.type() == QVariant::Double ) return true;
if ( v.type() == QVariant::Int ) return true;
if ( v.type() == QVariant::UInt ) return true;
if ( v.type() == QVariant::LongLong ) return true;
if ( v.type() == QVariant::ULongLong ) return true;
if ( v.type() == QVariant::String )
{
bool ok;
double val = v.toString().toDouble( &ok );
ok = ok && qIsFinite( val ) && !qIsNaN( val );
return ok;
}
return false;
}
inline bool isDateTimeSafe( const QVariant& v )
{
return v.type() == QVariant::DateTime || v.type() == QVariant::Date ||
v.type() == QVariant::Time;
}
inline bool isIntervalSafe( const QVariant& v )
{
if ( v.canConvert<QgsInterval>() )
{
return true;
}
if ( v.type() == QVariant::String )
{
return QgsInterval::fromString( v.toString() ).isValid();
}
return false;
}
inline bool isNull( const QVariant& v ) { return v.isNull(); }
///////////////////////////////////////////////
// evaluation error macros
#define ENSURE_NO_EVAL_ERROR { if (parent->hasEvalError()) return QVariant(); }
#define SET_EVAL_ERROR(x) { parent->setEvalErrorString(x); return QVariant(); }
///////////////////////////////////////////////
// operators
const char* QgsExpression::BinaryOperatorText[] =
{
// this must correspond (number and order of element) to the declaration of the enum BinaryOperator
"OR", "AND",
"=", "<>", "<=", ">=", "<", ">", "~", "LIKE", "NOT LIKE", "ILIKE", "NOT ILIKE", "IS", "IS NOT",
"+", "-", "*", "/", "//", "%", "^",
"||"
};
const char* QgsExpression::UnaryOperatorText[] =
{
// this must correspond (number and order of element) to the declaration of the enum UnaryOperator
"NOT", "-"
};
///////////////////////////////////////////////
// functions
// implicit conversion to string
static QString getStringValue( const QVariant& value, QgsExpression* )
{
return value.toString();
}
static double getDoubleValue( const QVariant& value, QgsExpression* parent )
{
bool ok;
double x = value.toDouble( &ok );
if ( !ok || qIsNaN( x ) || !qIsFinite( x ) )
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to double" ).arg( value.toString() ) );
return 0;
}
return x;
}
static int getIntValue( const QVariant& value, QgsExpression* parent )
{
bool ok;
qint64 x = value.toLongLong( &ok );
if ( ok && x >= std::numeric_limits<int>::min() && x <= std::numeric_limits<int>::max() )
{
return x;
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to int" ).arg( value.toString() ) );
return 0;
}
}
static QDateTime getDateTimeValue( const QVariant& value, QgsExpression* parent )
{
QDateTime d = value.toDateTime();
if ( d.isValid() )
{
return d;
}
else
{
QTime t = value.toTime();
if ( t.isValid() )
{
return QDateTime( QDate( 1, 1, 1 ), t );
}
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to DateTime" ).arg( value.toString() ) );
return QDateTime();
}
}
static QDate getDateValue( const QVariant& value, QgsExpression* parent )
{
QDate d = value.toDate();
if ( d.isValid() )
{
return d;
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to Date" ).arg( value.toString() ) );
return QDate();
}
}
static QTime getTimeValue( const QVariant& value, QgsExpression* parent )
{
QTime t = value.toTime();
if ( t.isValid() )
{
return t;
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to Time" ).arg( value.toString() ) );
return QTime();
}
}
static QgsInterval getInterval( const QVariant& value, QgsExpression* parent, bool report_error = false )
{
if ( value.canConvert<QgsInterval>() )
return value.value<QgsInterval>();
QgsInterval inter = QgsInterval::fromString( value.toString() );
if ( inter.isValid() )
{
return inter;
}
// If we get here then we can't convert so we just error and return invalid.
if ( report_error )
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to Interval" ).arg( value.toString() ) );
return QgsInterval();
}
static QgsGeometry getGeometry( const QVariant& value, QgsExpression* parent )
{
if ( value.canConvert<QgsGeometry>() )
return value.value<QgsGeometry>();
parent->setEvalErrorString( QStringLiteral( "Cannot convert to QgsGeometry" ) );
return QgsGeometry();
}
static QgsFeature getFeature( const QVariant& value, QgsExpression* parent )
{
if ( value.canConvert<QgsFeature>() )
return value.value<QgsFeature>();
parent->setEvalErrorString( QStringLiteral( "Cannot convert to QgsFeature" ) );
return 0;
}
#define FEAT_FROM_CONTEXT(c, f) if (!c || !c->hasVariable(QgsExpressionContext::EXPR_FEATURE)) return QVariant(); \
QgsFeature f = qvariant_cast<QgsFeature>( c->variable( QgsExpressionContext::EXPR_FEATURE ) );
static QgsExpression::Node* getNode( const QVariant& value, QgsExpression* parent )
{
if ( value.canConvert<QgsExpression::Node*>() )
return value.value<QgsExpression::Node*>();
parent->setEvalErrorString( QStringLiteral( "Cannot convert to Node" ) );
return nullptr;
}
QgsVectorLayer* getVectorLayer( const QVariant& value, QgsExpression* )
{
QString layerString = value.toString();
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( layerString ) ); //search by id first
if ( !vl )
{
QList<QgsMapLayer *> layersByName = QgsMapLayerRegistry::instance()->mapLayersByName( layerString );
if ( !layersByName.isEmpty() )
{
vl = qobject_cast<QgsVectorLayer*>( layersByName.at( 0 ) );
}
}
return vl;
}
// this handles also NULL values
static TVL getTVLValue( const QVariant& value, QgsExpression* parent )
{
// we need to convert to TVL
if ( value.isNull() )
return Unknown;
//handle some special cases
if ( value.canConvert<QgsGeometry>() )
{
//geom is false if empty
QgsGeometry geom = value.value<QgsGeometry>();
return geom.isEmpty() ? False : True;
}
else if ( value.canConvert<QgsFeature>() )
{
//feat is false if non-valid
QgsFeature feat = value.value<QgsFeature>();
return feat.isValid() ? True : False;
}
if ( value.type() == QVariant::Int )
return value.toInt() != 0 ? True : False;
bool ok;
double x = value.toDouble( &ok );
if ( !ok )
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to boolean" ).arg( value.toString() ) );
return Unknown;
}
return !qgsDoubleNear( x, 0.0 ) ? True : False;
}
static QVariantList getListValue( const QVariant& value, QgsExpression* parent )
{
if ( value.type() == QVariant::List || value.type() == QVariant::StringList )
{
return value.toList();
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to array" ).arg( value.toString() ) );
return QVariantList();
}
}
static QVariantMap getMapValue( const QVariant& value, QgsExpression* parent )
{
if ( value.type() == QVariant::Map )
{
return value.toMap();
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to map" ).arg( value.toString() ) );
return QVariantMap();
}
}
//////
static QVariant fcnGetVariable( const QVariantList& values, const QgsExpressionContext* context, QgsExpression* parent )
{
if ( !context )
return QVariant();
QString name = getStringValue( values.at( 0 ), parent );
return context->variable( name );
}
static QVariant fcnEval( const QVariantList& values, const QgsExpressionContext* context, QgsExpression* parent )
{
if ( !context )
return QVariant();
QString expString = getStringValue( values.at( 0 ), parent );
QgsExpression expression( expString );
return expression.evaluate( context );
}
static QVariant fcnSqrt( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( sqrt( x ) );
}
static QVariant fcnAbs( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double val = getDoubleValue( values.at( 0 ), parent );
return QVariant( fabs( val ) );
}
static QVariant fcnRadians( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double deg = getDoubleValue( values.at( 0 ), parent );
return ( deg * M_PI ) / 180;
}
static QVariant fcnDegrees( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double rad = getDoubleValue( values.at( 0 ), parent );
return ( 180 * rad ) / M_PI;
}
static QVariant fcnSin( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( sin( x ) );
}
static QVariant fcnCos( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( cos( x ) );
}
static QVariant fcnTan( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( tan( x ) );
}
static QVariant fcnAsin( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( asin( x ) );
}
static QVariant fcnAcos( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( acos( x ) );
}
static QVariant fcnAtan( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( atan( x ) );
}
static QVariant fcnAtan2( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double y = getDoubleValue( values.at( 0 ), parent );
double x = getDoubleValue( values.at( 1 ), parent );
return QVariant( atan2( y, x ) );
}
static QVariant fcnExp( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( exp( x ) );
}
static QVariant fcnLn( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
if ( x <= 0 )
return QVariant();
return QVariant( log( x ) );
}
static QVariant fcnLog10( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
if ( x <= 0 )
return QVariant();
return QVariant( log10( x ) );
}
static QVariant fcnLog( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double b = getDoubleValue( values.at( 0 ), parent );
double x = getDoubleValue( values.at( 1 ), parent );
if ( x <= 0 || b <= 0 )
return QVariant();
return QVariant( log( x ) / log( b ) );
}
static QVariant fcnRndF( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double min = getDoubleValue( values.at( 0 ), parent );
double max = getDoubleValue( values.at( 1 ), parent );
if ( max < min )
return QVariant();
// Return a random double in the range [min, max] (inclusive)
double f = static_cast< double >( qrand() ) / RAND_MAX;
return QVariant( min + f * ( max - min ) );
}
static QVariant fcnRnd( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
int min = getIntValue( values.at( 0 ), parent );
int max = getIntValue( values.at( 1 ), parent );
if ( max < min )
return QVariant();
// Return a random integer in the range [min, max] (inclusive)
return QVariant( min + ( qrand() % static_cast< int >( max - min + 1 ) ) );
}
static QVariant fcnLinearScale( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double val = getDoubleValue( values.at( 0 ), parent );
double domainMin = getDoubleValue( values.at( 1 ), parent );
double domainMax = getDoubleValue( values.at( 2 ), parent );
double rangeMin = getDoubleValue( values.at( 3 ), parent );
double rangeMax = getDoubleValue( values.at( 4 ), parent );
if ( domainMin >= domainMax )
{
parent->setEvalErrorString( QObject::tr( "Domain max must be greater than domain min" ) );
return QVariant();
}
// outside of domain?
if ( val >= domainMax )
{
return rangeMax;
}
else if ( val <= domainMin )
{
return rangeMin;
}
// calculate linear scale
double m = ( rangeMax - rangeMin ) / ( domainMax - domainMin );
double c = rangeMin - ( domainMin * m );
// Return linearly scaled value
return QVariant( m * val + c );
}
static QVariant fcnExpScale( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double val = getDoubleValue( values.at( 0 ), parent );
double domainMin = getDoubleValue( values.at( 1 ), parent );
double domainMax = getDoubleValue( values.at( 2 ), parent );
double rangeMin = getDoubleValue( values.at( 3 ), parent );
double rangeMax = getDoubleValue( values.at( 4 ), parent );
double exponent = getDoubleValue( values.at( 5 ), parent );
if ( domainMin >= domainMax )
{
parent->setEvalErrorString( QObject::tr( "Domain max must be greater than domain min" ) );
return QVariant();
}
if ( exponent <= 0 )
{
parent->setEvalErrorString( QObject::tr( "Exponent must be greater than 0" ) );
return QVariant();
}
// outside of domain?
if ( val >= domainMax )
{
return rangeMax;
}
else if ( val <= domainMin )
{
return rangeMin;
}
// Return exponentially scaled value
return QVariant((( rangeMax - rangeMin ) / pow( domainMax - domainMin, exponent ) ) * pow( val - domainMin, exponent ) + rangeMin );
}
static QVariant fcnMax( const QVariantList& values, const QgsExpressionContext*, QgsExpression *parent )
{
//initially set max as first value
double maxVal = getDoubleValue( values.at( 0 ), parent );
//check against all other values
for ( int i = 1; i < values.length(); ++i )
{
double testVal = getDoubleValue( values[i], parent );
if ( testVal > maxVal )
{
maxVal = testVal;
}
}
return QVariant( maxVal );
}
static QVariant fcnMin( const QVariantList& values, const QgsExpressionContext*, QgsExpression *parent )
{
//initially set min as first value
double minVal = getDoubleValue( values.at( 0 ), parent );
//check against all other values
for ( int i = 1; i < values.length(); ++i )
{
double testVal = getDoubleValue( values[i], parent );
if ( testVal < minVal )
{
minVal = testVal;
}
}
return QVariant( minVal );
}
static QVariant fcnAggregate( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
//lazy eval, so we need to evaluate nodes now
//first node is layer id or name
QgsExpression::Node* node = getNode( values.at( 0 ), parent );
ENSURE_NO_EVAL_ERROR;
QVariant value = node->eval( parent, context );
ENSURE_NO_EVAL_ERROR;
QgsVectorLayer* vl = getVectorLayer( value, parent );
if ( !vl )
{
parent->setEvalErrorString( QObject::tr( "Cannot find layer with name or ID '%1'" ).arg( value.toString() ) );
return QVariant();
}
// second node is aggregate type
node = getNode( values.at( 1 ), parent );
ENSURE_NO_EVAL_ERROR;
value = node->eval( parent, context );
ENSURE_NO_EVAL_ERROR;
bool ok = false;
QgsAggregateCalculator::Aggregate aggregate = QgsAggregateCalculator::stringToAggregate( getStringValue( value, parent ), &ok );
if ( !ok )
{
parent->setEvalErrorString( QObject::tr( "No such aggregate '%1'" ).arg( value.toString() ) );
return QVariant();
}
// third node is subexpression (or field name)
node = getNode( values.at( 2 ), parent );
ENSURE_NO_EVAL_ERROR;
QString subExpression = node->dump();
QgsAggregateCalculator::AggregateParameters parameters;
//optional forth node is filter
if ( values.count() > 3 )
{
node = getNode( values.at( 3 ), parent );
ENSURE_NO_EVAL_ERROR;
QgsExpression::NodeLiteral* nl = dynamic_cast< QgsExpression::NodeLiteral* >( node );
if ( !nl || nl->value().isValid() )
parameters.filter = node->dump();
}
//optional fifth node is concatenator
if ( values.count() > 4 )
{
node = getNode( values.at( 4 ), parent );
ENSURE_NO_EVAL_ERROR;
value = node->eval( parent, context );
ENSURE_NO_EVAL_ERROR;
parameters.delimiter = value.toString();
}
QString cacheKey = QStringLiteral( "aggfcn:%1:%2:%3:%4" ).arg( vl->id(), QString::number( static_cast< int >( aggregate ) ), subExpression, parameters.filter );
if ( context && context->hasCachedValue( cacheKey ) )
return context->cachedValue( cacheKey );
QVariant result;
if ( context )
{
QgsExpressionContext subContext( *context );
result = vl->aggregate( aggregate, subExpression, parameters, &subContext, &ok );
}
else
{
result = vl->aggregate( aggregate, subExpression, parameters, nullptr, &ok );
}
if ( !ok )
{
parent->setEvalErrorString( QObject::tr( "Could not calculate aggregate for: %1" ).arg( subExpression ) );
return QVariant();
}
// cache value
if ( context )
context->setCachedValue( cacheKey, result );
return result;
}
static QVariant fcnAggregateRelation( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
if ( !context )
{
parent->setEvalErrorString( QObject::tr( "Cannot use relation aggregate function in this context" ) );
return QVariant();
}
// first step - find current layer
QString layerId = context->variable( QStringLiteral( "layer_id" ) ).toString();
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( layerId ) );
if ( !vl )
{
parent->setEvalErrorString( QObject::tr( "Cannot use relation aggregate function in this context" ) );
return QVariant();
}
//lazy eval, so we need to evaluate nodes now
//first node is relation name
QgsExpression::Node* node = getNode( values.at( 0 ), parent );
ENSURE_NO_EVAL_ERROR;
QVariant value = node->eval( parent, context );
ENSURE_NO_EVAL_ERROR;
QString relationId = value.toString();
// check relation exists
QgsRelation relation = QgsProject::instance()->relationManager()->relation( relationId );
if ( !relation.isValid() || relation.referencedLayer() != vl )
{
// check for relations by name
QList< QgsRelation > relations = QgsProject::instance()->relationManager()->relationsByName( relationId );
if ( relations.isEmpty() || relations.at( 0 ).referencedLayer() != vl )
{
parent->setEvalErrorString( QObject::tr( "Cannot find relation with id '%1'" ).arg( relationId ) );
return QVariant();
}
else
{
relation = relations.at( 0 );
}
}
QgsVectorLayer* childLayer = relation.referencingLayer();
// second node is aggregate type
node = getNode( values.at( 1 ), parent );
ENSURE_NO_EVAL_ERROR;
value = node->eval( parent, context );
ENSURE_NO_EVAL_ERROR;
bool ok = false;
QgsAggregateCalculator::Aggregate aggregate = QgsAggregateCalculator::stringToAggregate( getStringValue( value, parent ), &ok );
if ( !ok )
{
parent->setEvalErrorString( QObject::tr( "No such aggregate '%1'" ).arg( value.toString() ) );
return QVariant();
}
//third node is subexpression (or field name)
node = getNode( values.at( 2 ), parent );
ENSURE_NO_EVAL_ERROR;
QString subExpression = node->dump();
//optional fourth node is concatenator
QgsAggregateCalculator::AggregateParameters parameters;
if ( values.count() > 3 )
{
node = getNode( values.at( 3 ), parent );
ENSURE_NO_EVAL_ERROR;
value = node->eval( parent, context );
ENSURE_NO_EVAL_ERROR;
parameters.delimiter = value.toString();
}
FEAT_FROM_CONTEXT( context, f );
parameters.filter = relation.getRelatedFeaturesFilter( f );
QString cacheKey = QStringLiteral( "relagg:%1:%2:%3:%4" ).arg( vl->id(),
QString::number( static_cast< int >( aggregate ) ),
subExpression,
parameters.filter );
if ( context && context->hasCachedValue( cacheKey ) )
return context->cachedValue( cacheKey );
QVariant result;
ok = false;
QgsExpressionContext subContext( *context );
result = childLayer->aggregate( aggregate, subExpression, parameters, &subContext, &ok );
if ( !ok )
{
parent->setEvalErrorString( QObject::tr( "Could not calculate aggregate for: %1" ).arg( subExpression ) );
return QVariant();
}
// cache value
if ( context )
context->setCachedValue( cacheKey, result );
return result;
}
static QVariant fcnAggregateGeneric( QgsAggregateCalculator::Aggregate aggregate, const QVariantList& values, QgsAggregateCalculator::AggregateParameters parameters, const QgsExpressionContext* context, QgsExpression *parent )
{
if ( !context )
{
parent->setEvalErrorString( QObject::tr( "Cannot use aggregate function in this context" ) );
return QVariant();
}
// first step - find current layer
QString layerId = context->variable( QStringLiteral( "layer_id" ) ).toString();
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( layerId ) );
if ( !vl )
{
parent->setEvalErrorString( QObject::tr( "Cannot use aggregate function in this context" ) );
return QVariant();
}
//lazy eval, so we need to evaluate nodes now
//first node is subexpression (or field name)
QgsExpression::Node* node = getNode( values.at( 0 ), parent );
ENSURE_NO_EVAL_ERROR;
QString subExpression = node->dump();
//optional second node is group by
QString groupBy;
if ( values.count() > 1 )
{
node = getNode( values.at( 1 ), parent );
ENSURE_NO_EVAL_ERROR;
QgsExpression::NodeLiteral* nl = dynamic_cast< QgsExpression::NodeLiteral* >( node );
if ( !nl || nl->value().isValid() )
groupBy = node->dump();
}
//optional third node is filter
if ( values.count() > 2 )
{
node = getNode( values.at( 2 ), parent );
ENSURE_NO_EVAL_ERROR;
QgsExpression::NodeLiteral* nl = dynamic_cast< QgsExpression::NodeLiteral* >( node );
if ( !nl || nl->value().isValid() )
parameters.filter = node->dump();
}
// build up filter with group by
// find current group by value
if ( !groupBy.isEmpty() )
{
QgsExpression groupByExp( groupBy );
QVariant groupByValue = groupByExp.evaluate( context );
if ( !parameters.filter.isEmpty() )
parameters.filter = QStringLiteral( "(%1) AND (%2=%3)" ).arg( parameters.filter, groupBy, QgsExpression::quotedValue( groupByValue ) );
else
parameters.filter = QStringLiteral( "(%2 = %3)" ).arg( groupBy, QgsExpression::quotedValue( groupByValue ) );
}
QString cacheKey = QStringLiteral( "agg:%1:%2:%3:%4" ).arg( vl->id(),
QString::number( static_cast< int >( aggregate ) ),
subExpression,
parameters.filter );
if ( context && context->hasCachedValue( cacheKey ) )
return context->cachedValue( cacheKey );
QVariant result;
bool ok = false;
QgsExpressionContext subContext( *context );
result = vl->aggregate( aggregate, subExpression, parameters, &subContext, &ok );
if ( !ok )
{
parent->setEvalErrorString( QObject::tr( "Could not calculate aggregate for: %1" ).arg( subExpression ) );
return QVariant();
}
// cache value
if ( context )
context->setCachedValue( cacheKey, result );
return result;
}
static QVariant fcnAggregateCount( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Count, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateCountDistinct( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::CountDistinct, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateCountMissing( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::CountMissing, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateMin( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Min, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateMax( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Max, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateSum( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Sum, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateMean( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Mean, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateMedian( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Median, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateStdev( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::StDevSample, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateRange( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Range, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateMinority( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Minority, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateMajority( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::Majority, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateQ1( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::FirstQuartile, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateQ3( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::ThirdQuartile, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateIQR( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::InterQuartileRange, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateMinLength( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::StringMinimumLength, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateMaxLength( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::StringMaximumLength, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateCollectGeometry( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
return fcnAggregateGeneric( QgsAggregateCalculator::GeometryCollect, values, QgsAggregateCalculator::AggregateParameters(), context, parent );
}
static QVariant fcnAggregateStringConcat( const QVariantList& values, const QgsExpressionContext* context, QgsExpression *parent )
{
QgsAggregateCalculator::AggregateParameters parameters;
//fourth node is concatenator
if ( values.count() > 3 )
{
QgsExpression::Node* node = getNode( values.at( 3 ), parent );
ENSURE_NO_EVAL_ERROR;
QVariant value = node->eval( parent, context );
ENSURE_NO_EVAL_ERROR;
parameters.delimiter = value.toString();
}
return fcnAggregateGeneric( QgsAggregateCalculator::StringConcatenate, values, parameters, context, parent );
}
static QVariant fcnClamp( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
{
double minValue = getDoubleValue( values.at( 0 ), parent );
double testValue = getDoubleValue( values.at( 1 ), parent );
double maxValue = getDoubleValue( values.at( 2 ), parent );