qgsvectorlayerutils.h

Go to the documentation of this file.

/***************************************************************************
  qgsvectorlayerutils.h
  ---------------------
  Date                 : October 2016
  Copyright            : (C) 2016 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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSVECTORLAYERUTILS_H
#define QGSVECTORLAYERUTILS_H
 
#include "qgis_core.h"
#include "qgsgeometry.h"
#include "qgsvectorlayerfeatureiterator.h"
#include "qgsfeaturesink.h"
 
class QgsFeatureRenderer;
class QgsSymbolLayer;
class QgsSymbolLayerId;
 
class CORE_EXPORT QgsVectorLayerUtils
{
  public:
 
    class CORE_EXPORT QgsDuplicateFeatureContext
    {
      public:
 
        QgsDuplicateFeatureContext() = default;
 
        QList<QgsVectorLayer *> layers() const;
 
        QgsFeatureIds duplicatedFeatures( QgsVectorLayer *layer ) const;
 
 
      private:
        QMap<QgsVectorLayer *, QgsFeatureIds> mDuplicatedFeatures;
        friend class QgsVectorLayerUtils;
 
        void setDuplicatedFeatures( QgsVectorLayer *layer, const QgsFeatureIds &ids );
    };
 
    class CORE_EXPORT QgsFeatureData
    {
      public:
 
        QgsFeatureData( const QgsGeometry &geometry = QgsGeometry(), const QgsAttributeMap &attributes = QgsAttributeMap() );
 
        QgsGeometry geometry() const;
 
        QgsAttributeMap attributes() const;
 
      private:
        QgsGeometry mGeometry;
        QgsAttributeMap mAttributes;
    };
 
    // SIP does not like "using", use legacy typedef
    typedef QList<QgsVectorLayerUtils::QgsFeatureData> QgsFeaturesDataList;
 
    static QgsFeatureIterator getValuesIterator( const QgsVectorLayer *layer, const QString &fieldOrExpression, bool &ok, bool selectedOnly );
 
    static QList< QVariant > getValues( const QgsVectorLayer *layer, const QString &fieldOrExpression, bool &ok, bool selectedOnly = false, QgsFeedback *feedback = nullptr );
 
    static QList< double > getDoubleValues( const QgsVectorLayer *layer, const QString &fieldOrExpression, bool &ok, bool selectedOnly = false, int *nullCount = nullptr, QgsFeedback *feedback = nullptr );
 
    static bool valueExists( const QgsVectorLayer *layer, int fieldIndex, const QVariant &value, const QgsFeatureIds &ignoreIds = QgsFeatureIds() );
 
    static QVariant createUniqueValue( const QgsVectorLayer *layer, int fieldIndex, const QVariant &seed = QVariant() );
 
    static QVariant createUniqueValueFromCache( const QgsVectorLayer *layer, int fieldIndex, const QSet<QVariant> &existingValues, const QVariant &seed = QVariant() );
 
    static bool validateAttribute( const QgsVectorLayer *layer, const QgsFeature &feature, int attributeIndex, QStringList &errors SIP_OUT,
                                   QgsFieldConstraints::ConstraintStrength strength = QgsFieldConstraints::ConstraintStrengthNotSet,
                                   QgsFieldConstraints::ConstraintOrigin origin = QgsFieldConstraints::ConstraintOriginNotSet );
 
    static QgsFeature createFeature( const QgsVectorLayer *layer,
                                     const QgsGeometry &geometry = QgsGeometry(),
                                     const QgsAttributeMap &attributes = QgsAttributeMap(),
                                     QgsExpressionContext *context = nullptr );
 
    static QgsFeatureList createFeatures( const QgsVectorLayer *layer,
                                          const QgsFeaturesDataList &featuresData,
                                          QgsExpressionContext *context = nullptr );
 
    static QgsFeature duplicateFeature( QgsVectorLayer *layer, const QgsFeature &feature, QgsProject *project, QgsDuplicateFeatureContext &duplicateFeatureContext SIP_OUT, const int maxDepth = 0, int depth SIP_PYARGREMOVE = 0, QList<QgsVectorLayer *> referencedLayersBranch SIP_PYARGREMOVE = QList<QgsVectorLayer *>() );
 
 
    static std::unique_ptr<QgsVectorLayerFeatureSource> getFeatureSource( QPointer<QgsVectorLayer> layer, QgsFeedback *feedback = nullptr ) SIP_SKIP;
 
    static void matchAttributesToFields( QgsFeature &feature, const QgsFields &fields );
 
    static QgsFeatureList makeFeatureCompatible( const QgsFeature &feature, const QgsVectorLayer *layer, QgsFeatureSink::SinkFlags sinkFlags = QgsFeatureSink::SinkFlags() );
 
    static QgsFeatureList makeFeaturesCompatible( const QgsFeatureList &features, const QgsVectorLayer *layer, QgsFeatureSink::SinkFlags sinkFlags = QgsFeatureSink::SinkFlags() );
 
    static bool fieldIsEditable( const QgsVectorLayer *layer, int fieldIndex, const QgsFeature &feature );
 
    static bool fieldIsReadOnly( const QgsVectorLayer *layer, int fieldIndex );
 
    static bool fieldEditabilityDependsOnFeature( const QgsVectorLayer *layer, int fieldIndex );
 
    static QHash<QString, QHash<QString, QSet<QgsSymbolLayerId>>> labelMasks( const QgsVectorLayer * ) SIP_SKIP;
 
    static QHash<QString, QSet<QgsSymbolLayerId>> symbolLayerMasks( const QgsVectorLayer * ) SIP_SKIP;
 
    static QString getFeatureDisplayString( const QgsVectorLayer *layer, const QgsFeature &feature );
 
    enum CascadedFeatureFlag
    {
      IgnoreAuxiliaryLayers = 1 << 1, 
    };
    Q_DECLARE_FLAGS( CascadedFeatureFlags, CascadedFeatureFlag )
 
    
    static bool impactsCascadeFeatures( const QgsVectorLayer *layer, const QgsFeatureIds &fids, const QgsProject *project, QgsDuplicateFeatureContext &context SIP_OUT, QgsVectorLayerUtils::CascadedFeatureFlags flags = QgsVectorLayerUtils::CascadedFeatureFlags() );
 
    static QString guessFriendlyIdentifierField( const QgsFields &fields );
 
};
 
 
#endif // QGSVECTORLAYERUTILS_H