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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 "qgsprocessingcontext.h"
QList<QgsRasterLayer *> QgsProcessingUtils::compatibleRasterLayers( QgsProject *project, bool sort )
{
if ( !project )
return QList<QgsRasterLayer *>();
QList<QgsRasterLayer *> layers;
Q_FOREACH ( QgsRasterLayer *l, project->layers<QgsRasterLayer *>() )
{
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<QgsWkbTypes::GeometryType> &geometryTypes, bool sort )
{
if ( !project )
return QList<QgsVectorLayer *>();
QList<QgsVectorLayer *> layers;
Q_FOREACH ( QgsVectorLayer *l, project->layers<QgsVectorLayer *>() )
{
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<QgsMapLayer *> QgsProcessingUtils::compatibleLayers( QgsProject *project, bool sort )
{
if ( !project )
return QList<QgsMapLayer *>();
QList<QgsMapLayer *> layers;
Q_FOREACH ( QgsRasterLayer *rl, compatibleRasterLayers( project, false ) )
layers << rl;
Q_FOREACH ( QgsVectorLayer *vl, compatibleVectorLayers( project, QList< QgsWkbTypes::GeometryType >(), false ) )
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;
}
QgsMapLayer *QgsProcessingUtils::mapLayerFromProject( const QString &string, QgsProject *project )
{
if ( string.isEmpty() )
return nullptr;
QList< QgsMapLayer * > layers = compatibleLayers( project, false );
Q_FOREACH ( QgsMapLayer *l, layers )
{
if ( l->id() == string )
return l;
}
Q_FOREACH ( QgsMapLayer *l, layers )
{
if ( l->name() == string )
return l;
}
Q_FOREACH ( QgsMapLayer *l, layers )
{
if ( normalizeLayerSource( l->source() ) == normalizeLayerSource( string ) )
return l;
}
return nullptr;
}
///@cond PRIVATE
class ProjectionSettingRestorer
{
public:
ProjectionSettingRestorer()
{
QgsSettings settings;
previousSetting = settings.value( QStringLiteral( "/Projections/defaultBehavior" ) ).toString();
settings.setValue( QStringLiteral( "/Projections/defaultBehavior" ), QString() );
}
~ProjectionSettingRestorer()
{
QgsSettings settings;
settings.setValue( QStringLiteral( "/Projections/defaultBehavior" ), previousSetting );
}
QString previousSetting;
};
///@endcond PRIVATE
QgsMapLayer *QgsProcessingUtils::mapLayerFromString( const QString &string )
{
if ( QFileInfo::exists( string ) )
{
// TODO - remove when there is a cleaner way to block the unknown projection dialog!
ProjectionSettingRestorer restorer;
( void )restorer; // no warnings
// brute force attempt to load a matching layer
std::unique_ptr< QgsVectorLayer > layer( new QgsVectorLayer( string, QStringLiteral( "temp" ), QStringLiteral( "ogr" ), false ) );
if ( layer->isValid() )
{
return layer.release();
}
std::unique_ptr< QgsRasterLayer > rasterLayer( new QgsRasterLayer( string, QStringLiteral( "temp" ), QStringLiteral( "gdal" ), false ) );
if ( rasterLayer->isValid() )
{
return rasterLayer.release();
}
}
return nullptr;
}
bool QgsProcessingUtils::canUseLayer( const QgsRasterLayer *layer )
{
// only gdal file-based layers
return layer && layer->providerType() == QStringLiteral( "gdal" );
}
bool QgsProcessingUtils::canUseLayer( const QgsVectorLayer *layer, const QList<QgsWkbTypes::GeometryType> &geometryTypes )
{
return layer &&
( geometryTypes.isEmpty() || geometryTypes.contains( layer->geometryType() ) );
}
QString QgsProcessingUtils::normalizeLayerSource( const QString &source )
{
QString normalized = source;
normalized.replace( '\\', '/' );
normalized.replace( '"', "'" );
return normalized.trimmed();
}
QgsFeatureIterator QgsProcessingUtils::getFeatures( QgsVectorLayer *layer, const QgsProcessingContext &context, const QgsFeatureRequest &request )
{
bool useSelection = context.flags() & QgsProcessingContext::UseSelectionIfPresent && layer->selectedFeatureCount() > 0;
QgsFeatureRequest req( request );
req.setInvalidGeometryCheck( context.invalidGeometryCheck() );
req.setInvalidGeometryCallback( context.invalidGeometryCallback() );
if ( useSelection )
{
return layer->getSelectedFeatures( req );
}
else
{
return layer->getFeatures( req );
}
}
long QgsProcessingUtils::featureCount( QgsVectorLayer *layer, const QgsProcessingContext &context )
{
bool useSelection = context.flags() & QgsProcessingContext::UseSelectionIfPresent && layer->selectedFeatureCount() > 0;
if ( useSelection )
return layer->selectedFeatureCount();
else
return layer->featureCount();
}
QList<QVariant> QgsProcessingUtils::uniqueValues( QgsVectorLayer *layer, int fieldIndex, const QgsProcessingContext &context )
{
if ( !layer )
return QList<QVariant>();
if ( fieldIndex < 0 || fieldIndex >= layer->fields().count() )
return QList<QVariant>();
bool useSelection = context.flags() & QgsProcessingContext::UseSelectionIfPresent && layer->selectedFeatureCount() > 0;
if ( !useSelection )
{
// not using selection, so use provider optimised version
QList<QVariant> values;
layer->uniqueValues( fieldIndex, values );
return values;
}
else
{
// using selection, so we have to iterate through selected features
QSet<QVariant> values;
QgsFeature f;
QgsFeatureIterator it = layer->getSelectedFeatures( QgsFeatureRequest().setSubsetOfAttributes( QgsAttributeList() << fieldIndex ).setFlags( QgsFeatureRequest::NoGeometry ) );
while ( it.nextFeature( f ) )
{
values.insert( f.attribute( fieldIndex ) );
}
return values.toList();
}
}