qgsofflineediting.h

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/***************************************************************************
    offline_editing.h
 
    Offline Editing Plugin
    a QGIS plugin
     --------------------------------------
    Date                 : 22-Jul-2010
    Copyright            : (C) 2010 by Sourcepole
    Email                : info at sourcepole.ch
 ***************************************************************************
 *                                                                         *
 *   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 QGS_OFFLINE_EDITING_H
#define QGS_OFFLINE_EDITING_H
 
#include "qgis_core.h"
#include "qgsfeature.h"
#include "qgssqliteutils.h"
 
#include <QObject>
#include <QString>
 
using namespace Qt::StringLiterals;
 
class QgsMapLayer;
class QgsVectorLayer;

class CORE_EXPORT QgsOfflineEditing : public QObject
{
    Q_OBJECT
 
  public:
    enum ProgressMode
    {
      CopyFeatures = 0,
      ProcessFeatures,
      AddFields,
      AddFeatures,
      RemoveFeatures,
      UpdateFeatures,
      UpdateGeometries
    };

    enum ContainerType
    {
      SpatiaLite,
      GPKG
    };
 
    QgsOfflineEditing();

    bool convertToOfflineProject(
      const QString &offlineDataPath, const QString &offlineDbFile, const QStringList &layerIds, bool onlySelected = false, ContainerType containerType = SpatiaLite, const QString &layerNameSuffix = u" (offline)"_s
    );

    bool isOfflineProject() const;
 

    void synchronize( bool useTransaction = false );
 
  signals:

    void progressStarted();

    void layerProgressUpdated( int layer, int numLayers );

    void progressModeSet( QgsOfflineEditing::ProgressMode mode, long long maximum );

    void progressUpdated( long long progress );

    void progressStopped();

    void warning( const QString &title, const QString &message );
 
  private:
    void initializeSpatialMetadata( sqlite3 *sqlite_handle );
    bool createOfflineDb( const QString &offlineDbPath, ContainerType containerType = SpatiaLite );
    void createLoggingTables( sqlite3 *db );
 
    void convertToOfflineLayer(
      QgsVectorLayer *layer, sqlite3 *db, const QString &offlineDbPath, bool onlySelected, ContainerType containerType = SpatiaLite, const QString &layerNameSuffix = u" (offline)"_s
    );
 
    void applyAttributesAdded( QgsVectorLayer *remoteLayer, sqlite3 *db, int layerId, int commitNo );
    void applyFeaturesAdded( QgsVectorLayer *offlineLayer, QgsVectorLayer *remoteLayer, sqlite3 *db, int layerId );
    void applyFeaturesRemoved( QgsVectorLayer *remoteLayer, sqlite3 *db, int layerId );
    void applyAttributeValueChanges( QgsVectorLayer *offlineLayer, QgsVectorLayer *remoteLayer, sqlite3 *db, int layerId, int commitNo );
    void applyGeometryChanges( QgsVectorLayer *remoteLayer, sqlite3 *db, int layerId, int commitNo );
    void updateFidLookup( QgsVectorLayer *remoteLayer, sqlite3 *db, int layerId );

    int getLayerPkIdx( const QgsVectorLayer *layer ) const;
 
    QMap<int, int> attributeLookup( QgsVectorLayer *offlineLayer, QgsVectorLayer *remoteLayer );
 
    void showWarning( const QString &message );
 
    sqlite3_database_unique_ptr openLoggingDb();
    int getOrCreateLayerId( sqlite3 *db, const QString &qgisLayerId );
    int getCommitNo( sqlite3 *db );
    void increaseCommitNo( sqlite3 *db );
    void addFidLookup( sqlite3 *db, int layerId, QgsFeatureId offlineFid, QgsFeatureId remoteFid, const QString &remotePk );
    QgsFeatureId remoteFid( sqlite3 *db, int layerId, QgsFeatureId offlineFid, QgsVectorLayer *remoteLayer );
    QgsFeatureId offlineFid( sqlite3 *db, int layerId, QgsFeatureId remoteFid );
    bool isAddedFeature( sqlite3 *db, int layerId, QgsFeatureId fid );
 
    int sqlExec( sqlite3 *db, const QString &sql );
    int sqlQueryInt( sqlite3 *db, const QString &sql, int defaultValue );
    QString sqlQueryStr( sqlite3 *db, const QString &sql, QString &defaultValue );
    QList<int> sqlQueryInts( sqlite3 *db, const QString &sql );
    QString sqlEscape( QString value ) const;
 
    QList<QgsField> sqlQueryAttributesAdded( sqlite3 *db, const QString &sql );
    QgsFeatureIds sqlQueryFeaturesRemoved( sqlite3 *db, const QString &sql );
 
    struct AttributeValueChange
    {
        QgsFeatureId fid;
        int attr;
        QString value;
    };
    typedef QList<AttributeValueChange> AttributeValueChanges;
    AttributeValueChanges sqlQueryAttributeValueChanges( sqlite3 *db, const QString &sql );
 
    struct GeometryChange
    {
        QgsFeatureId fid;
        QString geom_wkt;
    };
    typedef QList<GeometryChange> GeometryChanges;
    GeometryChanges sqlQueryGeometryChanges( sqlite3 *db, const QString &sql );
 
  private slots:
    void setupLayer( QgsMapLayer *layer );
    void committedAttributesAdded( const QString &qgisLayerId, const QList<QgsField> &addedAttributes );
    void committedFeaturesAdded( const QString &qgisLayerId, const QgsFeatureList &addedFeatures );
    void committedFeaturesRemoved( const QString &qgisLayerId, const QgsFeatureIds &deletedFeatureIds );
    void committedAttributeValuesChanges( const QString &qgisLayerId, const QgsChangedAttributesMap &changedAttrsMap );
    void committedGeometriesChanges( const QString &qgisLayerId, const QgsGeometryMap &changedGeometries );
    void startListenFeatureChanges();
    void stopListenFeatureChanges();
};
 
#endif // QGS_OFFLINE_EDITING_H