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qgsprocessingutils.cpp
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qgsprocessingutils.cpp
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/***************************************************************************
qgsprocessingutils.cpp
------------------------
begin : April 2017
copyright : (C) 2017 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. *
* *
***************************************************************************/
#include "qgsprocessingutils.h"
#include "qgsproject.h"
#include "qgssettings.h"
#include "qgsexception.h"
#include "qgsprocessingcontext.h"
#include "qgsvectorlayerexporter.h"
#include "qgsvectorfilewriter.h"
#include "qgsmemoryproviderutils.h"
#include "qgsprocessingparameters.h"
#include "qgsprocessingalgorithm.h"
#include "qgsvectorlayerfeatureiterator.h"
#include "qgsexpressioncontextscopegenerator.h"
#include "qgsfileutils.h"
#include "qgsvectorlayer.h"
#include "qgsproviderregistry.h"
#include "qgsmeshlayer.h"
#include "qgsreferencedgeometry.h"
#include "qgsrasterfilewriter.h"
#include "qgsvectortilelayer.h"
QList<QgsRasterLayer *> QgsProcessingUtils::compatibleRasterLayers( QgsProject *project, bool sort )
{
if ( !project )
return QList<QgsRasterLayer *>();
QList<QgsRasterLayer *> layers;
const auto rasterLayers = project->layers<QgsRasterLayer *>();
for ( QgsRasterLayer *l : rasterLayers )
{
if ( canUseLayer( l ) )
layers << l;
}
if ( sort )
{
std::sort( layers.begin(), layers.end(), []( const QgsRasterLayer * a, const QgsRasterLayer * b ) -> bool
{
return QString::localeAwareCompare( a->name(), b->name() ) < 0;
} );
}
return layers;
}
QList<QgsVectorLayer *> QgsProcessingUtils::compatibleVectorLayers( QgsProject *project, const QList<int> &geometryTypes, bool sort )
{
if ( !project )
return QList<QgsVectorLayer *>();
QList<QgsVectorLayer *> layers;
const auto vectorLayers = project->layers<QgsVectorLayer *>();
for ( QgsVectorLayer *l : vectorLayers )
{
if ( canUseLayer( l, geometryTypes ) )
layers << l;
}
if ( sort )
{
std::sort( layers.begin(), layers.end(), []( const QgsVectorLayer * a, const QgsVectorLayer * b ) -> bool
{
return QString::localeAwareCompare( a->name(), b->name() ) < 0;
} );
}
return layers;
}
QList<QgsMeshLayer *> QgsProcessingUtils::compatibleMeshLayers( QgsProject *project, bool sort )
{
if ( !project )
return QList<QgsMeshLayer *>();
QList<QgsMeshLayer *> layers;
const auto meshLayers = project->layers<QgsMeshLayer *>();
for ( QgsMeshLayer *l : meshLayers )
{
if ( canUseLayer( l ) )
layers << l;
}
if ( sort )
{
std::sort( layers.begin(), layers.end(), []( const QgsMeshLayer * a, const QgsMeshLayer * b ) -> bool
{
return QString::localeAwareCompare( a->name(), b->name() ) < 0;
} );
}
return layers;
}
QList<QgsMapLayer *> QgsProcessingUtils::compatibleLayers( QgsProject *project, bool sort )
{
if ( !project )
return QList<QgsMapLayer *>();
QList<QgsMapLayer *> layers;
const auto rasterLayers = compatibleRasterLayers( project, false );
for ( QgsRasterLayer *rl : rasterLayers )
layers << rl;
const auto vectorLayers = compatibleVectorLayers( project, QList< int >(), false );
for ( QgsVectorLayer *vl : vectorLayers )
layers << vl;
const auto meshLayers = compatibleMeshLayers( project, false );
for ( QgsMeshLayer *vl : meshLayers )
layers << vl;
if ( sort )
{
std::sort( layers.begin(), layers.end(), []( const QgsMapLayer * a, const QgsMapLayer * b ) -> bool
{
return QString::localeAwareCompare( a->name(), b->name() ) < 0;
} );
}
return layers;
}
QString QgsProcessingUtils::encodeProviderKeyAndUri( const QString &providerKey, const QString &uri )
{
return QStringLiteral( "%1://%2" ).arg( providerKey, uri );
}
bool QgsProcessingUtils::decodeProviderKeyAndUri( const QString &string, QString &providerKey, QString &uri )
{
QRegularExpression re( QStringLiteral( "^(\\w+?):\\/\\/(.+)$" ) );
const QRegularExpressionMatch match = re.match( string );
if ( !match.hasMatch() )
return false;
providerKey = match.captured( 1 );
uri = match.captured( 2 );
// double check that provider is valid
return QgsProviderRegistry::instance()->providerMetadata( providerKey );
}
QgsMapLayer *QgsProcessingUtils::mapLayerFromStore( const QString &string, QgsMapLayerStore *store, QgsProcessingUtils::LayerHint typeHint )
{
if ( !store || string.isEmpty() )
return nullptr;
QList< QgsMapLayer * > layers = store->mapLayers().values();
layers.erase( std::remove_if( layers.begin(), layers.end(), []( QgsMapLayer * layer )
{
switch ( layer->type() )
{
case QgsMapLayerType::VectorLayer:
return !canUseLayer( qobject_cast< QgsVectorLayer * >( layer ) );
case QgsMapLayerType::RasterLayer:
return !canUseLayer( qobject_cast< QgsRasterLayer * >( layer ) );
case QgsMapLayerType::PluginLayer:
return true;
case QgsMapLayerType::MeshLayer:
return !canUseLayer( qobject_cast< QgsMeshLayer * >( layer ) );
case QgsMapLayerType::VectorTileLayer:
return !canUseLayer( qobject_cast< QgsVectorTileLayer * >( layer ) );
}
return true;
} ), layers.end() );
auto isCompatibleType = [typeHint]( QgsMapLayer * l ) -> bool
{
switch ( typeHint )
{
case LayerHint::UnknownType:
return true;
case LayerHint::Vector:
return l->type() == QgsMapLayerType::VectorLayer;
case LayerHint::Raster:
return l->type() == QgsMapLayerType::RasterLayer;
case LayerHint::Mesh:
return l->type() == QgsMapLayerType::MeshLayer;
}
return true;
};
for ( QgsMapLayer *l : qgis::as_const( layers ) )
{
if ( isCompatibleType( l ) && l->id() == string )
return l;
}
for ( QgsMapLayer *l : qgis::as_const( layers ) )
{
if ( isCompatibleType( l ) && l->name() == string )
return l;
}
for ( QgsMapLayer *l : qgis::as_const( layers ) )
{
if ( isCompatibleType( l ) && normalizeLayerSource( l->source() ) == normalizeLayerSource( string ) )
return l;
}
return nullptr;
}
QgsMapLayer *QgsProcessingUtils::loadMapLayerFromString( const QString &string, const QgsCoordinateTransformContext &transformContext, LayerHint typeHint )
{
QString provider;
QString uri;
const bool useProvider = decodeProviderKeyAndUri( string, provider, uri );
if ( !useProvider )
uri = string;
QString name;
// for disk based sources, we use the filename to determine a layer name
if ( !useProvider || ( provider == QLatin1String( "ogr" ) || provider == QLatin1String( "gdal" ) || provider == QLatin1String( "mdal" ) ) )
{
QStringList components = uri.split( '|' );
if ( components.isEmpty() )
return nullptr;
QFileInfo fi;
if ( QFileInfo::exists( uri ) )
fi = QFileInfo( uri );
else if ( QFileInfo::exists( components.at( 0 ) ) )
fi = QFileInfo( components.at( 0 ) );
else
return nullptr;
name = fi.baseName();
}
else
{
name = QgsDataSourceUri( uri ).table();
}
// brute force attempt to load a matching layer
if ( typeHint == LayerHint::UnknownType || typeHint == LayerHint::Vector )
{
QgsVectorLayer::LayerOptions options { transformContext };
options.loadDefaultStyle = false;
options.skipCrsValidation = true;
std::unique_ptr< QgsVectorLayer > layer;
if ( useProvider )
{
layer = qgis::make_unique<QgsVectorLayer>( uri, name, provider, options );
}
else
{
// fallback to ogr
layer = qgis::make_unique<QgsVectorLayer>( uri, name, QStringLiteral( "ogr" ), options );
}
if ( layer->isValid() )
{
return layer.release();
}
}
if ( typeHint == LayerHint::UnknownType || typeHint == LayerHint::Raster )
{
QgsRasterLayer::LayerOptions rasterOptions;
rasterOptions.loadDefaultStyle = false;
rasterOptions.skipCrsValidation = true;
std::unique_ptr< QgsRasterLayer > rasterLayer;
if ( useProvider )
{
rasterLayer = qgis::make_unique< QgsRasterLayer >( uri, name, provider, rasterOptions );
}
else
{
// fallback to gdal
rasterLayer = qgis::make_unique< QgsRasterLayer >( uri, name, QStringLiteral( "gdal" ), rasterOptions );
}
if ( rasterLayer->isValid() )
{
return rasterLayer.release();
}
}
if ( typeHint == LayerHint::UnknownType || typeHint == LayerHint::Mesh )
{
QgsMeshLayer::LayerOptions meshOptions;
meshOptions.skipCrsValidation = true;
std::unique_ptr< QgsMeshLayer > meshLayer;
if ( useProvider )
{
meshLayer = qgis::make_unique< QgsMeshLayer >( uri, name, provider, meshOptions );
}
else
{
meshLayer = qgis::make_unique< QgsMeshLayer >( uri, name, QStringLiteral( "mdal" ), meshOptions );
}
if ( meshLayer->isValid() )
{
return meshLayer.release();
}
}
return nullptr;
}
QgsMapLayer *QgsProcessingUtils::mapLayerFromString( const QString &string, QgsProcessingContext &context, bool allowLoadingNewLayers, LayerHint typeHint )
{
if ( string.isEmpty() )
return nullptr;
// prefer project layers
QgsMapLayer *layer = nullptr;
if ( context.project() )
{
QgsMapLayer *layer = mapLayerFromStore( string, context.project()->layerStore(), typeHint );
if ( layer )
return layer;
}
layer = mapLayerFromStore( string, context.temporaryLayerStore(), typeHint );
if ( layer )
return layer;
if ( !allowLoadingNewLayers )
return nullptr;
layer = loadMapLayerFromString( string, context.transformContext(), typeHint );
if ( layer )
{
context.temporaryLayerStore()->addMapLayer( layer );
return layer;
}
else
{
return nullptr;
}
}
QgsProcessingFeatureSource *QgsProcessingUtils::variantToSource( const QVariant &value, QgsProcessingContext &context, const QVariant &fallbackValue )
{
QVariant val = value;
bool selectedFeaturesOnly = false;
long long featureLimit = -1;
bool overrideGeometryCheck = false;
QgsFeatureRequest::InvalidGeometryCheck geometryCheck = QgsFeatureRequest::GeometryAbortOnInvalid;
if ( val.canConvert<QgsProcessingFeatureSourceDefinition>() )
{
// input is a QgsProcessingFeatureSourceDefinition - get extra properties from it
QgsProcessingFeatureSourceDefinition fromVar = qvariant_cast<QgsProcessingFeatureSourceDefinition>( val );
selectedFeaturesOnly = fromVar.selectedFeaturesOnly;
featureLimit = fromVar.featureLimit;
val = fromVar.source;
overrideGeometryCheck = fromVar.flags & QgsProcessingFeatureSourceDefinition::Flag::FlagOverrideDefaultGeometryCheck;
geometryCheck = fromVar.geometryCheck;
}
else if ( val.canConvert<QgsProcessingOutputLayerDefinition>() )
{
// input is a QgsProcessingOutputLayerDefinition (e.g. an output from earlier in a model) - get extra properties from it
QgsProcessingOutputLayerDefinition fromVar = qvariant_cast<QgsProcessingOutputLayerDefinition>( val );
val = fromVar.sink;
}
if ( QgsVectorLayer *layer = qobject_cast< QgsVectorLayer * >( qvariant_cast<QObject *>( val ) ) )
{
std::unique_ptr< QgsProcessingFeatureSource> source = qgis::make_unique< QgsProcessingFeatureSource >( layer, context, false, featureLimit );
if ( overrideGeometryCheck )
source->setInvalidGeometryCheck( geometryCheck );
return source.release();
}
QString layerRef;
if ( val.canConvert<QgsProperty>() )
{
layerRef = val.value< QgsProperty >().valueAsString( context.expressionContext(), fallbackValue.toString() );
}
else if ( !val.isValid() || val.toString().isEmpty() )
{
// fall back to default
if ( QgsVectorLayer *layer = qobject_cast< QgsVectorLayer * >( qvariant_cast<QObject *>( fallbackValue ) ) )
{
std::unique_ptr< QgsProcessingFeatureSource> source = qgis::make_unique< QgsProcessingFeatureSource >( layer, context, false, featureLimit );
if ( overrideGeometryCheck )
source->setInvalidGeometryCheck( geometryCheck );
return source.release();
}
layerRef = fallbackValue.toString();
}
else
{
layerRef = val.toString();
}
if ( layerRef.isEmpty() )
return nullptr;
QgsVectorLayer *vl = qobject_cast< QgsVectorLayer *>( QgsProcessingUtils::mapLayerFromString( layerRef, context, true, LayerHint::Vector ) );
if ( !vl )
return nullptr;
std::unique_ptr< QgsProcessingFeatureSource> source;
if ( selectedFeaturesOnly )
{
source = qgis::make_unique< QgsProcessingFeatureSource>( new QgsVectorLayerSelectedFeatureSource( vl ), context, true, featureLimit );
}
else
{
source = qgis::make_unique< QgsProcessingFeatureSource >( vl, context, false, featureLimit );
}
if ( overrideGeometryCheck )
source->setInvalidGeometryCheck( geometryCheck );
return source.release();
}
QgsCoordinateReferenceSystem QgsProcessingUtils::variantToCrs( const QVariant &value, QgsProcessingContext &context, const QVariant &fallbackValue )
{
QVariant val = value;
if ( val.canConvert<QgsCoordinateReferenceSystem>() )
{
// input is a QgsCoordinateReferenceSystem - done!
return val.value< QgsCoordinateReferenceSystem >();
}
else if ( val.canConvert<QgsProcessingFeatureSourceDefinition>() )
{
// input is a QgsProcessingFeatureSourceDefinition - get extra properties from it
QgsProcessingFeatureSourceDefinition fromVar = qvariant_cast<QgsProcessingFeatureSourceDefinition>( val );
val = fromVar.source;
}
else if ( val.canConvert<QgsProcessingOutputLayerDefinition>() )
{
// input is a QgsProcessingOutputLayerDefinition - get extra properties from it
QgsProcessingOutputLayerDefinition fromVar = qvariant_cast<QgsProcessingOutputLayerDefinition>( val );
val = fromVar.sink;
}
if ( val.canConvert<QgsProperty>() && val.value< QgsProperty >().propertyType() == QgsProperty::StaticProperty )
{
val = val.value< QgsProperty >().staticValue();
}
// maybe a map layer
if ( QgsMapLayer *layer = qobject_cast< QgsMapLayer * >( qvariant_cast<QObject *>( val ) ) )
return layer->crs();
if ( val.canConvert<QgsProperty>() )
val = val.value< QgsProperty >().valueAsString( context.expressionContext(), fallbackValue.toString() );
if ( !val.isValid() )
{
// fall back to default
val = fallbackValue;
}
QString crsText = val.toString();
if ( crsText.isEmpty() )
crsText = fallbackValue.toString();
if ( crsText.isEmpty() )
return QgsCoordinateReferenceSystem();
// maybe special string
if ( context.project() && crsText.compare( QLatin1String( "ProjectCrs" ), Qt::CaseInsensitive ) == 0 )
return context.project()->crs();
// maybe a map layer reference
if ( QgsMapLayer *layer = QgsProcessingUtils::mapLayerFromString( crsText, context ) )
return layer->crs();
// else CRS from string
QgsCoordinateReferenceSystem crs;
crs.createFromString( crsText );
return crs;
}
bool QgsProcessingUtils::canUseLayer( const QgsMeshLayer *layer )
{
return layer && layer->dataProvider();
}
bool QgsProcessingUtils::canUseLayer( const QgsVectorTileLayer *layer )
{
return layer && layer->isValid();
}
bool QgsProcessingUtils::canUseLayer( const QgsRasterLayer *layer )
{
return layer && layer->isValid();
}
bool QgsProcessingUtils::canUseLayer( const QgsVectorLayer *layer, const QList<int> &sourceTypes )
{
return layer && layer->isValid() &&
( sourceTypes.isEmpty()
|| ( sourceTypes.contains( QgsProcessing::TypeVectorPoint ) && layer->geometryType() == QgsWkbTypes::PointGeometry )
|| ( sourceTypes.contains( QgsProcessing::TypeVectorLine ) && layer->geometryType() == QgsWkbTypes::LineGeometry )
|| ( sourceTypes.contains( QgsProcessing::TypeVectorPolygon ) && layer->geometryType() == QgsWkbTypes::PolygonGeometry )
|| ( sourceTypes.contains( QgsProcessing::TypeVectorAnyGeometry ) && layer->isSpatial() )
|| sourceTypes.contains( QgsProcessing::TypeVector )
);
}
QString QgsProcessingUtils::normalizeLayerSource( const QString &source )
{
QString normalized = source;
normalized.replace( '\\', '/' );
return normalized.trimmed();
}
QString QgsProcessingUtils::variantToPythonLiteral( const QVariant &value )
{
if ( !value.isValid() )
return QStringLiteral( "None" );
if ( value.canConvert<QgsProperty>() )
return QStringLiteral( "QgsProperty.fromExpression('%1')" ).arg( value.value< QgsProperty >().asExpression() );
else if ( value.canConvert<QgsCoordinateReferenceSystem>() )
{
if ( !value.value< QgsCoordinateReferenceSystem >().isValid() )
return QStringLiteral( "QgsCoordinateReferenceSystem()" );
else
return QStringLiteral( "QgsCoordinateReferenceSystem('%1')" ).arg( value.value< QgsCoordinateReferenceSystem >().authid() );
}
else if ( value.canConvert< QgsRectangle >() )
{
QgsRectangle r = value.value<QgsRectangle>();
return QStringLiteral( "'%1, %3, %2, %4'" ).arg( qgsDoubleToString( r.xMinimum() ),
qgsDoubleToString( r.yMinimum() ),
qgsDoubleToString( r.xMaximum() ),
qgsDoubleToString( r.yMaximum() ) );
}
else if ( value.canConvert< QgsReferencedRectangle >() )
{
QgsReferencedRectangle r = value.value<QgsReferencedRectangle>();
return QStringLiteral( "'%1, %3, %2, %4 [%5]'" ).arg( qgsDoubleToString( r.xMinimum() ),
qgsDoubleToString( r.yMinimum() ),
qgsDoubleToString( r.xMaximum() ),
qgsDoubleToString( r.yMaximum() ), r.crs().authid() );
}
else if ( value.canConvert< QgsPointXY >() )
{
QgsPointXY r = value.value<QgsPointXY>();
return QStringLiteral( "'%1,%2'" ).arg( qgsDoubleToString( r.x() ),
qgsDoubleToString( r.y() ) );
}
else if ( value.canConvert< QgsReferencedPointXY >() )
{
QgsReferencedPointXY r = value.value<QgsReferencedPointXY>();
return QStringLiteral( "'%1,%2 [%3]'" ).arg( qgsDoubleToString( r.x() ),
qgsDoubleToString( r.y() ),
r.crs().authid() );
}
switch ( value.type() )
{
case QVariant::Bool:
return value.toBool() ? QStringLiteral( "True" ) : QStringLiteral( "False" );
case QVariant::Double:
return QString::number( value.toDouble() );
case QVariant::Int:
case QVariant::UInt:
return QString::number( value.toInt() );
case QVariant::LongLong:
case QVariant::ULongLong:
return QString::number( value.toLongLong() );
case QVariant::List:
{
QStringList parts;
const QVariantList vl = value.toList();
for ( const QVariant &v : vl )
{
parts << variantToPythonLiteral( v );
}
return parts.join( ',' ).prepend( '[' ).append( ']' );
}
case QVariant::Map:
{
const QVariantMap map = value.toMap();
QStringList parts;
parts.reserve( map.size() );
for ( auto it = map.constBegin(); it != map.constEnd(); ++it )
{
parts << QStringLiteral( "%1: %2" ).arg( stringToPythonLiteral( it.key() ), variantToPythonLiteral( it.value() ) );
}
return parts.join( ',' ).prepend( '{' ).append( '}' );
}
default:
break;
}
return QgsProcessingUtils::stringToPythonLiteral( value.toString() );
}
QString QgsProcessingUtils::stringToPythonLiteral( const QString &string )
{
QString s = string;
s.replace( '\\', QStringLiteral( "\\\\" ) );
s.replace( '\n', QStringLiteral( "\\n" ) );
s.replace( '\r', QStringLiteral( "\\r" ) );
s.replace( '\t', QStringLiteral( "\\t" ) );
s.replace( '"', QStringLiteral( "\\\"" ) );
s.replace( '\'', QStringLiteral( "\\\'" ) );
s = s.prepend( '\'' ).append( '\'' );
return s;
}
void QgsProcessingUtils::parseDestinationString( QString &destination, QString &providerKey, QString &uri, QString &layerName, QString &format, QMap<QString, QVariant> &options, bool &useWriter, QString &extension )
{
extension.clear();
bool matched = decodeProviderKeyAndUri( destination, providerKey, uri );
if ( !matched )
{
QRegularExpression splitRx( QStringLiteral( "^(.{3,}?):(.*)$" ) );
QRegularExpressionMatch match = splitRx.match( destination );
if ( match.hasMatch() )
{
providerKey = match.captured( 1 );
uri = match.captured( 2 );
matched = true;
}
}
if ( matched )
{
if ( providerKey == QStringLiteral( "postgis" ) ) // older processing used "postgis" instead of "postgres"
{
providerKey = QStringLiteral( "postgres" );
}
if ( providerKey == QLatin1String( "ogr" ) )
{
QgsDataSourceUri dsUri( uri );
if ( !dsUri.database().isEmpty() )
{
if ( !dsUri.table().isEmpty() )
{
layerName = dsUri.table();
options.insert( QStringLiteral( "layerName" ), layerName );
}
uri = dsUri.database();
extension = QFileInfo( uri ).completeSuffix();
format = QgsVectorFileWriter::driverForExtension( extension );
}
else
{
extension = QFileInfo( uri ).completeSuffix();
}
options.insert( QStringLiteral( "update" ), true );
}
useWriter = false;
}
else
{
useWriter = true;
providerKey = QStringLiteral( "ogr" );
QRegularExpression splitRx( QStringLiteral( "^(.*)\\.(.*?)$" ) );
QRegularExpressionMatch match = splitRx.match( destination );
if ( match.hasMatch() )
{
extension = match.captured( 2 );
format = QgsVectorFileWriter::driverForExtension( extension );
}
if ( format.isEmpty() )
{
format = QStringLiteral( "GPKG" );
destination = destination + QStringLiteral( ".gpkg" );
}
options.insert( QStringLiteral( "driverName" ), format );
uri = destination;
}
}
QgsFeatureSink *QgsProcessingUtils::createFeatureSink( QString &destination, QgsProcessingContext &context, const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs, const QVariantMap &createOptions, QgsFeatureSink::SinkFlags sinkFlags, QgsRemappingSinkDefinition *remappingDefinition )
{
QVariantMap options = createOptions;
if ( !options.contains( QStringLiteral( "fileEncoding" ) ) )
{
// no destination encoding specified, use default
options.insert( QStringLiteral( "fileEncoding" ), context.defaultEncoding().isEmpty() ? QStringLiteral( "system" ) : context.defaultEncoding() );
}
if ( destination.isEmpty() || destination.startsWith( QLatin1String( "memory:" ) ) )
{
// strip "memory:" from start of destination
if ( destination.startsWith( QLatin1String( "memory:" ) ) )
destination = destination.mid( 7 );
if ( destination.isEmpty() )
destination = QStringLiteral( "output" );
// memory provider cannot be used with QgsVectorLayerImport - so create layer manually
std::unique_ptr< QgsVectorLayer > layer( QgsMemoryProviderUtils::createMemoryLayer( destination, fields, geometryType, crs ) );
if ( !layer || !layer->isValid() )
{
throw QgsProcessingException( QObject::tr( "Could not create memory layer" ) );
}
// update destination to layer ID
destination = layer->id();
// this is a factory, so we need to return a proxy
std::unique_ptr< QgsProcessingFeatureSink > sink( new QgsProcessingFeatureSink( layer->dataProvider(), destination, context ) );
context.temporaryLayerStore()->addMapLayer( layer.release() );
return sink.release();
}
else
{
QString providerKey;
QString uri;
QString layerName;
QString format;
QString extension;
bool useWriter = false;
parseDestinationString( destination, providerKey, uri, layerName, format, options, useWriter, extension );
QgsFields newFields = fields;
if ( useWriter && providerKey == QLatin1String( "ogr" ) )
{
// use QgsVectorFileWriter for OGR destinations instead of QgsVectorLayerImport, as that allows
// us to use any OGR format which supports feature addition
QString finalFileName;
QgsVectorFileWriter::SaveVectorOptions saveOptions;
saveOptions.fileEncoding = options.value( QStringLiteral( "fileEncoding" ) ).toString();
saveOptions.driverName = format;
saveOptions.datasourceOptions = QgsVectorFileWriter::defaultDatasetOptions( format );
saveOptions.layerOptions = QgsVectorFileWriter::defaultLayerOptions( format );
saveOptions.symbologyExport = QgsVectorFileWriter::NoSymbology;
if ( remappingDefinition )
{
saveOptions.actionOnExistingFile = QgsVectorFileWriter::AppendToLayerNoNewFields;
// sniff destination file to get correct wkb type and crs
std::unique_ptr< QgsVectorLayer > vl = qgis::make_unique< QgsVectorLayer >( destination );
if ( vl->isValid() )
{
remappingDefinition->setDestinationWkbType( vl->wkbType() );
remappingDefinition->setDestinationCrs( vl->crs() );
newFields = vl->fields();
remappingDefinition->setDestinationFields( newFields );
}
context.expressionContext().setFields( fields );
}
else
{
saveOptions.actionOnExistingFile = QgsVectorFileWriter::CreateOrOverwriteFile;
}
std::unique_ptr< QgsVectorFileWriter > writer( QgsVectorFileWriter::create( destination, newFields, geometryType, crs, context.transformContext(), saveOptions, sinkFlags, &finalFileName ) );
if ( writer->hasError() )
{
throw QgsProcessingException( QObject::tr( "Could not create layer %1: %2" ).arg( destination, writer->errorMessage() ) );
}
destination = finalFileName;
if ( remappingDefinition )
{
std::unique_ptr< QgsRemappingProxyFeatureSink > remapSink = qgis::make_unique< QgsRemappingProxyFeatureSink >( *remappingDefinition, writer.release(), true );
remapSink->setExpressionContext( context.expressionContext() );
remapSink->setTransformContext( context.transformContext() );
return new QgsProcessingFeatureSink( remapSink.release(), destination, context, true );
}
else
return new QgsProcessingFeatureSink( writer.release(), destination, context, true );
}
else
{
const QgsVectorLayer::LayerOptions layerOptions { context.transformContext() };
if ( remappingDefinition )
{
//write to existing layer
// use destination string as layer name (eg "postgis:..." )
if ( !layerName.isEmpty() )
uri += QStringLiteral( "|layername=%1" ).arg( layerName );
std::unique_ptr< QgsVectorLayer > layer = qgis::make_unique<QgsVectorLayer>( uri, destination, providerKey, layerOptions );
// update destination to layer ID
destination = layer->id();
if ( layer->isValid() )
{
remappingDefinition->setDestinationWkbType( layer->wkbType() );
remappingDefinition->setDestinationCrs( layer->crs() );
remappingDefinition->setDestinationFields( layer->fields() );
}
std::unique_ptr< QgsRemappingProxyFeatureSink > remapSink = qgis::make_unique< QgsRemappingProxyFeatureSink >( *remappingDefinition, layer->dataProvider(), false );
context.temporaryLayerStore()->addMapLayer( layer.release() );
remapSink->setExpressionContext( context.expressionContext() );
remapSink->setTransformContext( context.transformContext() );
context.expressionContext().setFields( fields );
return new QgsProcessingFeatureSink( remapSink.release(), destination, context, true );
}
else
{
//create empty layer
std::unique_ptr< QgsVectorLayerExporter > exporter = qgis::make_unique<QgsVectorLayerExporter>( uri, providerKey, newFields, geometryType, crs, true, options, sinkFlags );
if ( exporter->errorCode() )
{
throw QgsProcessingException( QObject::tr( "Could not create layer %1: %2" ).arg( destination, exporter->errorMessage() ) );
}
// use destination string as layer name (eg "postgis:..." )
if ( !layerName.isEmpty() )
uri += QStringLiteral( "|layername=%1" ).arg( layerName );
std::unique_ptr< QgsVectorLayer > layer = qgis::make_unique<QgsVectorLayer>( uri, destination, providerKey, layerOptions );
// update destination to layer ID
destination = layer->id();
context.temporaryLayerStore()->addMapLayer( layer.release() );
return new QgsProcessingFeatureSink( exporter.release(), destination, context, true );
}
}
}
}
void QgsProcessingUtils::createFeatureSinkPython( QgsFeatureSink **sink, QString &destination, QgsProcessingContext &context, const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs, const QVariantMap &options )
{
*sink = createFeatureSink( destination, context, fields, geometryType, crs, options );
}
QgsRectangle QgsProcessingUtils::combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs, QgsProcessingContext &context )
{
QgsRectangle extent;
for ( const QgsMapLayer *layer : layers )
{
if ( !layer )
continue;
if ( crs.isValid() )
{
//transform layer extent to target CRS
QgsCoordinateTransform ct( layer->crs(), crs, context.transformContext() );
try
{
QgsRectangle reprojExtent = ct.transformBoundingBox( layer->extent() );
extent.combineExtentWith( reprojExtent );
}
catch ( QgsCsException & )
{
// can't reproject... what to do here? hmmm?
// let's ignore this layer for now, but maybe we should just use the original extent?
}
}
else
{
extent.combineExtentWith( layer->extent() );
}
}
return extent;
}
// Deprecated
QgsRectangle QgsProcessingUtils::combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs )
{
QgsProcessingContext context;
return QgsProcessingUtils::combineLayerExtents( layers, crs, context );
}
QVariant QgsProcessingUtils::generateIteratingDestination( const QVariant &input, const QVariant &id, QgsProcessingContext &context )
{
if ( !input.isValid() )
return QStringLiteral( "memory:%1" ).arg( id.toString() );
if ( input.canConvert<QgsProcessingOutputLayerDefinition>() )
{
QgsProcessingOutputLayerDefinition fromVar = qvariant_cast<QgsProcessingOutputLayerDefinition>( input );
QVariant newSink = generateIteratingDestination( fromVar.sink, id, context );
fromVar.sink = QgsProperty::fromValue( newSink );
return fromVar;
}
else if ( input.canConvert<QgsProperty>() )
{
QString res = input.value< QgsProperty>().valueAsString( context.expressionContext() );
return generateIteratingDestination( res, id, context );
}
else
{
QString res = input.toString();
if ( res == QgsProcessing::TEMPORARY_OUTPUT )
{
// temporary outputs map to temporary outputs!
return QgsProcessing::TEMPORARY_OUTPUT;
}
else if ( res.startsWith( QLatin1String( "memory:" ) ) )
{
return res + '_' + id.toString();
}
else
{
// assume a filename type output for now
// TODO - uris?
int lastIndex = res.lastIndexOf( '.' );
return res.left( lastIndex ) + '_' + id.toString() + res.mid( lastIndex );
}
}
}
QString QgsProcessingUtils::tempFolder()
{
// we maintain a list of temporary folders -- this allows us to append additional
// folders when a setting change causes the base temp folder to change, while deferring
// cleanup of ALL these temp folders until session end (we can't cleanup older folders immediately,
// because we don't know whether they have data in them which is still wanted)
static std::vector< std::unique_ptr< QTemporaryDir > > sTempFolders;
static QString sFolder;
static QMutex sMutex;
QMutexLocker locker( &sMutex );
const QString basePath = QgsSettings().value( QStringLiteral( "Processing/Configuration/TEMP_PATH2" ) ).toString();
if ( basePath.isEmpty() )
{
// default setting -- automatically create a temp folder
if ( sTempFolders.empty() )
{
const QString templatePath = QStringLiteral( "%1/processing_XXXXXX" ).arg( QDir::tempPath() );
std::unique_ptr< QTemporaryDir > tempFolder = qgis::make_unique< QTemporaryDir >( templatePath );
sFolder = tempFolder->path();
sTempFolders.emplace_back( std::move( tempFolder ) );
}
}
else if ( sFolder.isEmpty() || !sFolder.startsWith( basePath ) || sTempFolders.empty() )
{
if ( !QDir().exists( basePath ) )
QDir().mkpath( basePath );
const QString templatePath = QStringLiteral( "%1/processing_XXXXXX" ).arg( basePath );
std::unique_ptr< QTemporaryDir > tempFolder = qgis::make_unique< QTemporaryDir >( templatePath );
sFolder = tempFolder->path();
sTempFolders.emplace_back( std::move( tempFolder ) );
}
return sFolder;
}
QString QgsProcessingUtils::generateTempFilename( const QString &basename )
{
QString subPath = QUuid::createUuid().toString().remove( '-' ).remove( '{' ).remove( '}' );
QString path = tempFolder() + '/' + subPath;
if ( !QDir( path ).exists() ) //make sure the directory exists - it shouldn't, but lets be safe...
{
QDir tmpDir;
tmpDir.mkdir( path );
}
return path + '/' + QgsFileUtils::stringToSafeFilename( basename );
}
QString QgsProcessingUtils::formatHelpMapAsHtml( const QVariantMap &map, const QgsProcessingAlgorithm *algorithm )
{
auto getText = [map]( const QString & key )->QString
{
if ( map.contains( key ) )
return map.value( key ).toString();
return QString();
};
QString s = QObject::tr( "<html><body><h2>Algorithm description</h2>\n" );
s += QStringLiteral( "<p>" ) + getText( QStringLiteral( "ALG_DESC" ) ) + QStringLiteral( "</p>\n" );
QString inputs;
const auto parameterDefinitions = algorithm->parameterDefinitions();
for ( const QgsProcessingParameterDefinition *def : parameterDefinitions )
{
inputs += QStringLiteral( "<h3>" ) + def->description() + QStringLiteral( "</h3>\n" );
inputs += QStringLiteral( "<p>" ) + getText( def->name() ) + QStringLiteral( "</p>\n" );
}
if ( !inputs.isEmpty() )
s += QObject::tr( "<h2>Input parameters</h2>\n" ) + inputs;
QString outputs;
const auto outputDefinitions = algorithm->outputDefinitions();
for ( const QgsProcessingOutputDefinition *def : outputDefinitions )
{
outputs += QStringLiteral( "<h3>" ) + def->description() + QStringLiteral( "</h3>\n" );
outputs += QStringLiteral( "<p>" ) + getText( def->name() ) + QStringLiteral( "</p>\n" );
}
if ( !outputs.isEmpty() )
s += QObject::tr( "<h2>Outputs</h2>\n" ) + outputs;
s += QLatin1String( "<br>" );
if ( !map.value( QStringLiteral( "ALG_CREATOR" ) ).toString().isEmpty() )
s += QObject::tr( "<p align=\"right\">Algorithm author: %1</p>" ).arg( getText( QStringLiteral( "ALG_CREATOR" ) ) );
if ( !map.value( QStringLiteral( "ALG_HELP_CREATOR" ) ).toString().isEmpty() )
s += QObject::tr( "<p align=\"right\">Help author: %1</p>" ).arg( getText( QStringLiteral( "ALG_HELP_CREATOR" ) ) );
if ( !map.value( QStringLiteral( "ALG_VERSION" ) ).toString().isEmpty() )