C++ QgsVectorDataProvider::capabilities方法代码示例

void QgsZonalStatisticsDialog::insertAvailableLayers()
{
  //insert available raster layers
  //enter available layers into the combo box
  QMap<QString, QgsMapLayer*> mapLayers = QgsMapLayerRegistry::instance()->mapLayers();
  QMap<QString, QgsMapLayer*>::iterator layer_it = mapLayers.begin();

  for ( ; layer_it != mapLayers.end(); ++layer_it )
  {
    QgsRasterLayer* rl = dynamic_cast<QgsRasterLayer*>( layer_it.value() );
    if ( rl )
    {
      QgsRasterDataProvider* rp = rl->dataProvider();
      if ( rp && rp->name() == "gdal" )
      {
        mRasterLayerComboBox->addItem( rl->name(), QVariant( rl->id() ) );
      }
    }
    else
    {
      QgsVectorLayer* vl = dynamic_cast<QgsVectorLayer*>( layer_it.value() );
      if ( vl && vl->geometryType() == QGis::Polygon )
      {
        QgsVectorDataProvider* provider  = vl->dataProvider();
        if ( provider->capabilities() & QgsVectorDataProvider::AddAttributes )
        {
          mPolygonLayerComboBox->addItem( vl->name(), QVariant( vl->id() ) );
        }
      }
    }
  }
}

bool QgsVectorLayerEditBuffer::commitChanges( QStringList& commitErrors )
{
  QgsVectorDataProvider* provider = L->dataProvider();
  commitErrors.clear();

  int cap = provider->capabilities();
  bool success = true;

  //
  // update geometries
  //
  if ( !mChangedGeometries.isEmpty() )
  {
    if (( cap & QgsVectorDataProvider::ChangeGeometries ) && provider->changeGeometryValues( mChangedGeometries ) )
    {
      commitErrors << tr( "SUCCESS: %n geometries were changed.", "changed geometries count", mChangedGeometries.size() );

      emit committedGeometriesChanges( L->id(), mChangedGeometries );

      mChangedGeometries.clear();
    }
    else
    {
      commitErrors << tr( "ERROR: %n geometries not changed.", "not changed geometries count", mChangedGeometries.size() );
      success = false;
    }
  }

  QgsFields oldFields = L->fields();

  //
  // delete attributes
  //
  bool attributesChanged = false;
  if ( !mDeletedAttributeIds.isEmpty() )
  {
    if (( cap & QgsVectorDataProvider::DeleteAttributes ) && provider->deleteAttributes( mDeletedAttributeIds.toSet() ) )
    {
      commitErrors << tr( "SUCCESS: %n attribute(s) deleted.", "deleted attributes count", mDeletedAttributeIds.size() );

      emit committedAttributesDeleted( L->id(), mDeletedAttributeIds );

      mDeletedAttributeIds.clear();
      attributesChanged = true;
    }
    else
    {
      commitErrors << tr( "ERROR: %n attribute(s) not deleted.", "not deleted attributes count", mDeletedAttributeIds.size() );
#if 0
      QString list = "ERROR: Pending attribute deletes:";
      Q_FOREACH ( int idx, mDeletedAttributeIds )
      {
        list.append( ' ' + L->pendingFields().at( idx ).name() );
      }
      commitErrors << list;
#endif
      success = false;
    }
  }

bool QgsVectorLayerFeatureIterator::providerCanSimplify( QgsSimplifyMethod::MethodType methodType ) const
{
  QgsVectorDataProvider* provider = L->dataProvider();

  if ( provider && methodType != QgsSimplifyMethod::NoSimplification )
  {
    int capabilities = provider->capabilities();

    if ( methodType == QgsSimplifyMethod::OptimizeForRendering )
    {
      return ( capabilities & QgsVectorDataProvider::SimplifyGeometries );
    }
    else if ( methodType == QgsSimplifyMethod::PreserveTopology )
    {
      return ( capabilities & QgsVectorDataProvider::SimplifyGeometriesWithTopologicalValidation );
    }
  }
  return false;
}

void QgsAddJoinDialog::on_mJoinLayerComboBox_currentIndexChanged( int index )
{
  mJoinFieldComboBox->clear();
  QString layerId = mJoinLayerComboBox->itemData( index ).toString();
  QgsMapLayer* layer = QgsMapLayerRegistry::instance()->mapLayer( layerId );
  QgsVectorLayer* vLayer = dynamic_cast<QgsVectorLayer*>( layer );
  if ( !vLayer )
  {
    return;
  }

  QStandardItemModel* subsetModel = new QStandardItemModel( this );

  const QgsFields& layerFields = vLayer->pendingFields();
  for ( int idx = 0; idx < layerFields.count(); ++idx )
  {
    mJoinFieldComboBox->addItem( layerFields[idx].name(), idx );
    QStandardItem* subsetItem = new QStandardItem( layerFields[idx].name() );
    subsetItem->setCheckable( true );
    //subsetItem->setFlags( subsetItem->flags() | Qt::ItemIsUserCheckable );
    subsetModel->appendRow( subsetItem );
  }

  //does provider support creation of attribute indices?
  QgsVectorDataProvider* dp = vLayer->dataProvider();
  if ( dp && ( dp->capabilities() & QgsVectorDataProvider::CreateAttributeIndex ) )
  {
    mCreateIndexCheckBox->setEnabled( true );
  }
  else
  {
    mCreateIndexCheckBox->setEnabled( false );
    mCreateIndexCheckBox->setChecked( false );
  }

  mJoinFieldsSubsetView->setModel( subsetModel );

  if ( !mUseCustomPrefix->isChecked() )
  {
    mCustomPrefix->setText( layer->name() + "_" );
  }
}

bool QgsVectorLayerEditBuffer::commitChanges( QStringList& commitErrors )
{
  QgsVectorDataProvider* provider = L->dataProvider();
  commitErrors.clear();

  int cap = provider->capabilities();
  bool success = true;

  QgsFields oldFields = L->pendingFields();

  bool hadPendingDeletes = !mDeletedFeatureIds.isEmpty();

  //
  // delete attributes
  //
  bool attributesChanged = false;
  if ( !mDeletedAttributeIds.isEmpty() )
  {
    if (( cap & QgsVectorDataProvider::DeleteAttributes ) && provider->deleteAttributes( mDeletedAttributeIds.toSet() ) )
    {
      commitErrors << tr( "SUCCESS: %n attribute(s) deleted.", "deleted attributes count", mDeletedAttributeIds.size() );

      emit committedAttributesDeleted( L->id(), mDeletedAttributeIds );

      mDeletedAttributeIds.clear();
      attributesChanged = true;
    }
    else
    {
      commitErrors << tr( "ERROR: %n attribute(s) not deleted.", "not deleted attributes count", mDeletedAttributeIds.size() );
#if 0
      QString list = "ERROR: Pending attribute deletes:";
      foreach ( int idx, mDeletedAttributeIds )
      {
        list.append( " " + L->pendingFields()[idx].name() );
      }
      commitErrors << list;
#endif
      success = false;
    }
  }

void QgsJoinDialog::joinedLayerChanged( QgsMapLayer* layer )
{
  mJoinFieldComboBox->clear();

  QgsVectorLayer* vLayer = dynamic_cast<QgsVectorLayer*>( layer );
  if ( !vLayer )
  {
    return;
  }

  mUseJoinFieldsSubset->setChecked( false );
  QStandardItemModel* subsetModel = new QStandardItemModel( this );
  const QgsFields& layerFields = vLayer->pendingFields();
  for ( int idx = 0; idx < layerFields.count(); ++idx )
  {
    QStandardItem* subsetItem = new QStandardItem( layerFields[idx].name() );
    subsetItem->setCheckable( true );
    //subsetItem->setFlags( subsetItem->flags() | Qt::ItemIsUserCheckable );
    subsetModel->appendRow( subsetItem );
  }
  mJoinFieldsSubsetView->setModel( subsetModel );

  QgsVectorDataProvider* dp = vLayer->dataProvider();
  bool canCreateAttrIndex = dp && ( dp->capabilities() & QgsVectorDataProvider::CreateAttributeIndex );
  if ( canCreateAttrIndex )
  {
    mCreateIndexCheckBox->setEnabled( true );
  }
  else
  {
    mCreateIndexCheckBox->setEnabled( false );
    mCreateIndexCheckBox->setChecked( false );
  }

  if ( !mUseCustomPrefix->isChecked() )
  {
    mCustomPrefix->setText( layer->name() + "_" );
  }
}

void QgsMapToolDigitizeFeature::cadCanvasReleaseEvent( QgsMapMouseEvent *e )
{
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mLayer );

  if ( !vlayer )
    //if no given layer take the current from canvas
    vlayer = currentVectorLayer();

  if ( !vlayer )
  {
    notifyNotVectorLayer();
    return;
  }

  QgsWkbTypes::Type layerWKBType = vlayer->wkbType();

  QgsVectorDataProvider *provider = vlayer->dataProvider();

  if ( !( provider->capabilities() & QgsVectorDataProvider::AddFeatures ) )
  {
    emit messageEmitted( tr( "The data provider for this layer does not support the addition of features." ), Qgis::Warning );
    return;
  }

  if ( !vlayer->isEditable() )
  {
    notifyNotEditableLayer();
    return;
  }

  // POINT CAPTURING
  if ( mode() == CapturePoint )
  {
    if ( e->button() != Qt::LeftButton )
      return;

    //check we only use this tool for point/multipoint layers
    if ( vlayer->geometryType() != QgsWkbTypes::PointGeometry && mCheckGeometryType )
    {
      emit messageEmitted( tr( "Wrong editing tool, cannot apply the 'capture point' tool on this vector layer" ), Qgis::Warning );
      return;
    }

    QgsPointXY savePoint; //point in layer coordinates
    try
    {
      QgsPoint fetchPoint;
      int res;
      res = fetchLayerPoint( e->mapPointMatch(), fetchPoint );
      if ( res == 0 )
      {
        savePoint = QgsPointXY( fetchPoint.x(), fetchPoint.y() );
      }
      else
      {
        savePoint = toLayerCoordinates( vlayer, e->mapPoint() );
      }
      QgsDebugMsg( "savePoint = " + savePoint.toString() );
    }
    catch ( QgsCsException &cse )
    {
      Q_UNUSED( cse );
      emit messageEmitted( tr( "Cannot transform the point to the layers coordinate system" ), Qgis::Warning );
      return;
    }

    //only do the rest for provider with feature addition support
    //note that for the grass provider, this will return false since
    //grass provider has its own mechanism of feature addition
    if ( provider->capabilities() & QgsVectorDataProvider::AddFeatures )
    {
      QgsFeature f( vlayer->fields(), 0 );

      QgsGeometry g;
      if ( layerWKBType == QgsWkbTypes::Point )
      {
        g = QgsGeometry::fromPointXY( savePoint );
      }
      else if ( !QgsWkbTypes::isMultiType( layerWKBType ) && QgsWkbTypes::hasZ( layerWKBType ) )
      {
        g = QgsGeometry( new QgsPoint( QgsWkbTypes::PointZ, savePoint.x(), savePoint.y(), defaultZValue() ) );
      }
      else if ( QgsWkbTypes::isMultiType( layerWKBType ) && !QgsWkbTypes::hasZ( layerWKBType ) )
      {
        g = QgsGeometry::fromMultiPointXY( QgsMultiPointXY() << savePoint );
      }
      else if ( QgsWkbTypes::isMultiType( layerWKBType ) && QgsWkbTypes::hasZ( layerWKBType ) )
      {
        QgsMultiPoint *mp = new QgsMultiPoint();
        mp->addGeometry( new QgsPoint( QgsWkbTypes::PointZ, savePoint.x(), savePoint.y(), defaultZValue() ) );
        g = QgsGeometry( mp );
      }
      else
      {
        // if layer supports more types (mCheckGeometryType is false)
        g = QgsGeometry::fromPointXY( savePoint );
      }

      if ( QgsWkbTypes::hasM( layerWKBType ) )
      {
//.........这里部分代码省略.........

void QgsMapToolAddFeature::canvasReleaseEvent( QMouseEvent * e )
{
  QgsDebugMsg( "entered." );

  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mCanvas->currentLayer() );

  if ( !vlayer )
  {
    notifyNotVectorLayer();
    return;
  }

  QGis::WkbType layerWKBType = vlayer->wkbType();

  QgsVectorDataProvider* provider = vlayer->dataProvider();

  if ( !( provider->capabilities() & QgsVectorDataProvider::AddFeatures ) )
  {
    QMessageBox::information( 0, tr( "Layer cannot be added to" ),
                              tr( "The data provider for this layer does not support the addition of features." ) );
    return;
  }

  if ( !vlayer->isEditable() )
  {
    notifyNotEditableLayer();
    return;
  }

  // POINT CAPTURING
  if ( mode() == CapturePoint )
  {
    //check we only use this tool for point/multipoint layers
    if ( vlayer->geometryType() != QGis::Point )
    {
      QMessageBox::information( 0, tr( "Wrong editing tool" ),
                                tr( "Cannot apply the 'capture point' tool on this vector layer" ) );
      return;
    }


    QgsPoint idPoint; //point in map coordinates
    QList<QgsSnappingResult> snapResults;
    QgsPoint savePoint; //point in layer coordinates

    if ( mSnapper.snapToBackgroundLayers( e->pos(), snapResults ) == 0 )
    {
      idPoint = snapPointFromResults( snapResults, e->pos() );
      try
      {
        savePoint = toLayerCoordinates( vlayer, idPoint );
        QgsDebugMsg( "savePoint = " + savePoint.toString() );
      }
      catch ( QgsCsException &cse )
      {
        Q_UNUSED( cse );
        QMessageBox::information( 0, tr( "Coordinate transform error" ),
                                  tr( "Cannot transform the point to the layers coordinate system" ) );
        return;
      }
    }

    //only do the rest for provider with feature addition support
    //note that for the grass provider, this will return false since
    //grass provider has its own mechanism of feature addition
    if ( provider->capabilities() & QgsVectorDataProvider::AddFeatures )
    {
      QgsFeature* f = new QgsFeature( 0, "WKBPoint" );

      QgsGeometry *g = 0;
      if ( layerWKBType == QGis::WKBPoint || layerWKBType == QGis::WKBPoint25D )
      {
        g = QgsGeometry::fromPoint( savePoint );
      }
      else if ( layerWKBType == QGis::WKBMultiPoint || layerWKBType == QGis::WKBMultiPoint25D )
      {
        g = QgsGeometry::fromMultiPoint( QgsMultiPoint() << savePoint );
      }

      f->setGeometry( g );

      vlayer->beginEditCommand( tr( "Feature added" ) );

      if ( addFeature( vlayer, f ) )
      {
        vlayer->endEditCommand();
      }
      else
      {
        delete f;
        vlayer->destroyEditCommand();
      }

      mCanvas->refresh();
    }
  }
  else if ( mode() == CaptureLine || mode() == CapturePolygon )
  {
    //check we only use the line tool for line/multiline layers
    if ( mode() == CaptureLine && vlayer->geometryType() != QGis::Line )
//.........这里部分代码省略.........

void QgsWfsProjectParser::featureTypeList( QDomElement& parentElement, QDomDocument& doc ) const
{
  const QList<QDomElement>& projectLayerElements = mProjectParser->projectLayerElements();
  if ( projectLayerElements.size() < 1 )
  {
    return;
  }

  QStringList wfsLayersId = mProjectParser->wfsLayers();
  QSet<QString> wfstUpdateLayersId = wfstUpdateLayers();
  QSet<QString> wfstInsertLayersId = wfstInsertLayers();
  QSet<QString> wfstDeleteLayersId = wfstDeleteLayers();

  QMap<QString, QgsMapLayer *> layerMap;

  Q_FOREACH ( const QDomElement &elem, projectLayerElements )
  {
    QString type = elem.attribute( "type" );
    if ( type == "vector" )
    {
      QString layerId = mProjectParser->layerId( elem );
      if ( !wfsLayersId.contains( layerId ) )
      {
        continue;
      }
      QgsMapLayer *layer = mProjectParser->createLayerFromElement( elem );
      if ( !layer )
      {
        continue;
      }
#ifdef HAVE_SERVER_PYTHON_PLUGINS
      if ( !mAccessControl->layerReadPermission( layer ) )
      {
        continue;
      }
#endif
      QgsDebugMsg( QString( "add layer %1 to map" ).arg( layer->id() ) );
      layerMap.insert( layer->id(), layer );

      QDomElement layerElem = doc.createElement( "FeatureType" );
      QDomElement nameElem = doc.createElement( "Name" );
      //We use the layer name even though it might not be unique.
      //Because the id sometimes contains user/pw information and the name is more descriptive
      QString typeName = layer->name();
      if ( !layer->shortName().isEmpty() )
        typeName = layer->shortName();
      typeName = typeName.replace( " ", "_" );
      QDomText nameText = doc.createTextNode( typeName );
      nameElem.appendChild( nameText );
      layerElem.appendChild( nameElem );

      QDomElement titleElem = doc.createElement( "Title" );
      QString titleName = layer->title();
      if ( titleName.isEmpty() )
      {
        titleName = layer->name();
      }
      QDomText titleText = doc.createTextNode( titleName );
      titleElem.appendChild( titleText );
      layerElem.appendChild( titleElem );

      QDomElement abstractElem = doc.createElement( "Abstract" );
      QString abstractName = layer->abstract();
      if ( abstractName.isEmpty() )
      {
        abstractName = "";
      }
      QDomText abstractText = doc.createTextNode( abstractName );
      abstractElem.appendChild( abstractText );
      layerElem.appendChild( abstractElem );

      //keyword list
      if ( !layer->keywordList().isEmpty() )
      {
        QDomElement keywordsElem = doc.createElement( "Keywords" );
        QDomText keywordsText = doc.createTextNode( layer->keywordList() );
        keywordsElem.appendChild( keywordsText );
        layerElem.appendChild( keywordsElem );
      }

      //appendExGeographicBoundingBox( layerElem, doc, layer->extent(), layer->crs() );

      QDomElement srsElem = doc.createElement( "SRS" );
      QDomText srsText = doc.createTextNode( layer->crs().authid() );
      srsElem.appendChild( srsText );
      layerElem.appendChild( srsElem );

      //wfs:Operations element
      QDomElement operationsElement = doc.createElement( "Operations"/*wfs:Operations*/ );
      //wfs:Query element
      QDomElement queryElement = doc.createElement( "Query"/*wfs:Query*/ );
      operationsElement.appendChild( queryElement );

      QgsVectorLayer* vlayer = qobject_cast<QgsVectorLayer*>( layer );
      QgsVectorDataProvider* provider = vlayer->dataProvider();
      if (( provider->capabilities() & QgsVectorDataProvider::AddFeatures ) && wfstInsertLayersId.contains( layer->id() ) )
      {
        //wfs:Insert element
        QDomElement insertElement = doc.createElement( "Insert"/*wfs:Insert*/ );
        operationsElement.appendChild( insertElement );
//.........这里部分代码省略.........

//.........这里部分代码省略.........
      QDomText titleText = doc.createTextNode( title );
      titleElem.appendChild( titleText );
      layerElem.appendChild( titleElem );

      //create Abstract
      QString abstract = layer->abstract();
      if ( !abstract.isEmpty() )
      {
        QDomElement abstractElem = doc.createElement( QStringLiteral( "Abstract" ) );
        QDomText abstractText = doc.createTextNode( abstract );
        abstractElem.appendChild( abstractText );
        layerElem.appendChild( abstractElem );
      }

      //create keywords
      QString keywords = layer->keywordList();
      if ( !keywords.isEmpty() )
      {
        QDomElement keywordsElem = doc.createElement( QStringLiteral( "Keywords" ) );
        QDomText keywordsText = doc.createTextNode( keywords );
        keywordsElem.appendChild( keywordsText );
        layerElem.appendChild( keywordsElem );
      }

      //create SRS
      QDomElement srsElem = doc.createElement( QStringLiteral( "SRS" ) );
      QDomText srsText = doc.createTextNode( layer->crs().authid() );
      srsElem.appendChild( srsText );
      layerElem.appendChild( srsElem );

      //create LatLongBoundingBox
      QgsRectangle layerExtent = layer->extent();
      QDomElement bBoxElement = doc.createElement( QStringLiteral( "LatLongBoundingBox" ) );
      bBoxElement.setAttribute( QStringLiteral( "minx" ), QString::number( layerExtent.xMinimum() ) );
      bBoxElement.setAttribute( QStringLiteral( "miny" ), QString::number( layerExtent.yMinimum() ) );
      bBoxElement.setAttribute( QStringLiteral( "maxx" ), QString::number( layerExtent.xMaximum() ) );
      bBoxElement.setAttribute( QStringLiteral( "maxy" ), QString::number( layerExtent.yMaximum() ) );
      layerElem.appendChild( bBoxElement );

      // layer metadata URL
      QString metadataUrl = layer->metadataUrl();
      if ( !metadataUrl.isEmpty() )
      {
        QDomElement metaUrlElem = doc.createElement( QStringLiteral( "MetadataURL" ) );
        QString metadataUrlType = layer->metadataUrlType();
        metaUrlElem.setAttribute( QStringLiteral( "type" ), metadataUrlType );
        QString metadataUrlFormat = layer->metadataUrlFormat();
        if ( metadataUrlFormat == QLatin1String( "text/xml" ) )
        {
          metaUrlElem.setAttribute( QStringLiteral( "format" ), QStringLiteral( "XML" ) );
        }
        else
        {
          metaUrlElem.setAttribute( QStringLiteral( "format" ), QStringLiteral( "TXT" ) );
        }
        QDomText metaUrlText = doc.createTextNode( metadataUrl );
        metaUrlElem.appendChild( metaUrlText );
        layerElem.appendChild( metaUrlElem );
      }

      //wfs:Operations element
      QDomElement operationsElement = doc.createElement( QStringLiteral( "Operations" )/*wfs:Operations*/ );
      //wfs:Query element
      QDomElement queryElement = doc.createElement( QStringLiteral( "Query" )/*wfs:Query*/ );
      operationsElement.appendChild( queryElement );
      if ( wfstUpdateLayersId.contains( layer->id() ) ||
           wfstInsertLayersId.contains( layer->id() ) ||
           wfstDeleteLayersId.contains( layer->id() ) )
      {
        QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( layer );
        QgsVectorDataProvider *provider = vlayer->dataProvider();
        if ( ( provider->capabilities() & QgsVectorDataProvider::AddFeatures ) && wfstInsertLayersId.contains( layer->id() ) )
        {
          //wfs:Insert element
          QDomElement insertElement = doc.createElement( QStringLiteral( "Insert" )/*wfs:Insert*/ );
          operationsElement.appendChild( insertElement );
        }
        if ( ( provider->capabilities() & QgsVectorDataProvider::ChangeAttributeValues ) &&
             ( provider->capabilities() & QgsVectorDataProvider::ChangeGeometries ) &&
             wfstUpdateLayersId.contains( layer->id() ) )
        {
          //wfs:Update element
          QDomElement updateElement = doc.createElement( QStringLiteral( "Update" )/*wfs:Update*/ );
          operationsElement.appendChild( updateElement );
        }
        if ( ( provider->capabilities() & QgsVectorDataProvider::DeleteFeatures ) && wfstDeleteLayersId.contains( layer->id() ) )
        {
          //wfs:Delete element
          QDomElement deleteElement = doc.createElement( QStringLiteral( "Delete" )/*wfs:Delete*/ );
          operationsElement.appendChild( deleteElement );
        }
      }

      layerElem.appendChild( operationsElement );

      featureTypeListElement.appendChild( layerElem );
    }

    return featureTypeListElement;
  }

//.........这里部分代码省略.........
      if ( layer && wfsLayersId.contains( layer->id() ) )
      {
#ifdef HAVE_SERVER_PYTHON_PLUGINS
        if ( actionName == QLatin1String( "Insert" ) )
        {
          if ( !accessControl->layerInsertPermission( layer ) )
          {
            throw QgsSecurityAccessException( QStringLiteral( "Feature insert permission denied" ) );
          }
        }
        else if ( actionName == QLatin1String( "Update" ) )
        {
          if ( !accessControl->layerUpdatePermission( layer ) )
          {
            throw QgsSecurityAccessException( QStringLiteral( "Feature update permission denied" ) );
          }
        }
        else if ( actionName == QLatin1String( "Delete" ) )
        {
          if ( !accessControl->layerDeletePermission( layer ) )
          {
            throw QgsSecurityAccessException( QStringLiteral( "Feature delete permission denied" ) );
          }
        }
#endif

        // Get the provider and it's capabilities
        QgsVectorDataProvider* provider = layer->dataProvider();
        if ( !provider )
        {
          continue;
        }

        int cap = provider->capabilities();

        // Start the update transaction
        layer->startEditing();
        if (( cap & QgsVectorDataProvider::ChangeAttributeValues ) && ( cap & QgsVectorDataProvider::ChangeGeometries ) )
        {
          // Loop through the update elements for this layer
          QDomNodeList upNodeList = typeNameElem.elementsByTagNameNS( WFS_NAMESPACE, QStringLiteral( "Update" ) );
          for ( int j = 0; j < upNodeList.count(); ++j )
          {
            if ( !configParser->wfstUpdateLayers().contains( layer->id() ) )
            {
              //no wfs permissions to do updates
              QString errorMsg = "No permissions to do WFS updates on layer '" + layer->name() + "'";
              QgsMessageLog::logMessage( errorMsg, QStringLiteral( "Server" ), QgsMessageLog::CRITICAL );
              addTransactionResult( resp, respElem, QStringLiteral( "FAILED" ), QStringLiteral( "Update" ), errorMsg );
              return resp;
            }

            actionElem = upNodeList.at( j ).toElement();

            // Get the Feature Ids for this filter on the layer
            QDomElement filterElem = actionElem.elementsByTagName( QStringLiteral( "Filter" ) ).at( 0 ).toElement();
            QgsFeatureIds fids = getFeatureIdsFromFilter( filterElem, layer );

            // Loop through the property elements
            // Store properties and the geometry element
            QDomNodeList propertyNodeList = actionElem.elementsByTagName( QStringLiteral( "Property" ) );
            QMap<QString, QString> propertyMap;
            QDomElement propertyElem;
            QDomElement nameElem;
            QDomElement valueElem;
            QDomElement geometryElem;

void QgsMapToolAddFeature::cadCanvasReleaseEvent( QgsMapMouseEvent* e )
{
  QgsVectorLayer* vlayer = currentVectorLayer();

  if ( !vlayer )
  {
    notifyNotVectorLayer();
    return;
  }

  QGis::WkbType layerWKBType = vlayer->wkbType();

  QgsVectorDataProvider* provider = vlayer->dataProvider();

  if ( !( provider->capabilities() & QgsVectorDataProvider::AddFeatures ) )
  {
    emit messageEmitted( tr( "The data provider for this layer does not support the addition of features." ), QgsMessageBar::WARNING );
    return;
  }

  if ( !vlayer->isEditable() )
  {
    notifyNotEditableLayer();
    return;
  }

  // POINT CAPTURING
  if ( mode() == CapturePoint )
  {
    if ( e->button() != Qt::LeftButton )
      return;

    //check we only use this tool for point/multipoint layers
    if ( vlayer->geometryType() != QGis::Point && mCheckGeometryType )
    {
      emit messageEmitted( tr( "Wrong editing tool, cannot apply the 'capture point' tool on this vector layer" ), QgsMessageBar::WARNING );
      return;
    }



    QgsPoint savePoint; //point in layer coordinates
    try
    {
      savePoint = toLayerCoordinates( vlayer, e->mapPoint() );
      QgsDebugMsg( "savePoint = " + savePoint.toString() );
    }
    catch ( QgsCsException &cse )
    {
      Q_UNUSED( cse );
      emit messageEmitted( tr( "Cannot transform the point to the layers coordinate system" ), QgsMessageBar::WARNING );
      return;
    }

    //only do the rest for provider with feature addition support
    //note that for the grass provider, this will return false since
    //grass provider has its own mechanism of feature addition
    if ( provider->capabilities() & QgsVectorDataProvider::AddFeatures )
    {
      QgsFeature f( vlayer->fields(), 0 );

      QgsGeometry *g = 0;
      if ( layerWKBType == QGis::WKBPoint || layerWKBType == QGis::WKBPoint25D )
      {
        g = QgsGeometry::fromPoint( savePoint );
      }
      else if ( layerWKBType == QGis::WKBMultiPoint || layerWKBType == QGis::WKBMultiPoint25D )
      {
        g = QgsGeometry::fromMultiPoint( QgsMultiPoint() << savePoint );
      }
      else
      {
        // if layer supports more types (mCheckGeometryType is false)
        g = QgsGeometry::fromPoint( savePoint );
      }

      f.setGeometry( g );
      f.setValid( true );

      addFeature( vlayer, &f, false );

      mCanvas->refresh();
    }
  }

  // LINE AND POLYGON CAPTURING
  else if ( mode() == CaptureLine || mode() == CapturePolygon )
  {
    //check we only use the line tool for line/multiline layers
    if ( mode() == CaptureLine && vlayer->geometryType() != QGis::Line && mCheckGeometryType )
    {
      emit messageEmitted( tr( "Wrong editing tool, cannot apply the 'capture line' tool on this vector layer" ), QgsMessageBar::WARNING );
      return;
    }

    //check we only use the polygon tool for polygon/multipolygon layers
    if ( mode() == CapturePolygon && vlayer->geometryType() != QGis::Polygon && mCheckGeometryType )
    {
      emit messageEmitted( tr( "Wrong editing tool, cannot apply the 'capture polygon' tool on this vector layer" ), QgsMessageBar::WARNING );
      return;
//.........这里部分代码省略.........

QgsVectorLayerImport::QgsVectorLayerImport( const QString &uri,
    const QString &providerKey,
    const QgsFields& fields,
    QGis::WkbType geometryType,
    const QgsCoordinateReferenceSystem* crs,
    bool overwrite,
    const QMap<QString, QVariant> *options,
    QProgressDialog *progress )
    : mErrorCount( 0 )
    , mAttributeCount( -1 )
    , mProgress( progress )

{
  mProvider = nullptr;

  QgsProviderRegistry * pReg = QgsProviderRegistry::instance();

  QLibrary *myLib = pReg->providerLibrary( providerKey );
  if ( !myLib )
  {
    mError = ErrInvalidProvider;
    mErrorMessage = QObject::tr( "Unable to load %1 provider" ).arg( providerKey );
    return;
  }

  createEmptyLayer_t * pCreateEmpty = reinterpret_cast< createEmptyLayer_t * >( cast_to_fptr( myLib->resolve( "createEmptyLayer" ) ) );
  if ( !pCreateEmpty )
  {
    delete myLib;
    mError = ErrProviderUnsupportedFeature;
    mErrorMessage = QObject::tr( "Provider %1 has no %2 method" ).arg( providerKey, "createEmptyLayer" );
    return;
  }

  delete myLib;

  // create an empty layer
  QString errMsg;
  mError = pCreateEmpty( uri, fields, geometryType, crs, overwrite, &mOldToNewAttrIdx, &errMsg, options );
  if ( hasError() )
  {
    mErrorMessage = errMsg;
    return;
  }

  Q_FOREACH ( int idx, mOldToNewAttrIdx.values() )
  {
    if ( idx > mAttributeCount )
      mAttributeCount = idx;
  }

  mAttributeCount++;

  QgsDebugMsg( "Created empty layer" );

  QgsVectorDataProvider *vectorProvider = dynamic_cast< QgsVectorDataProvider* >( pReg->provider( providerKey, uri ) );
  if ( !vectorProvider || !vectorProvider->isValid() || ( vectorProvider->capabilities() & QgsVectorDataProvider::AddFeatures ) == 0 )
  {
    mError = ErrInvalidLayer;
    mErrorMessage = QObject::tr( "Loading of layer failed" );

    if ( vectorProvider )
      delete vectorProvider;

    return;
  }

  mProvider = vectorProvider;
  mError = NoError;
}

bool QgsVectorLayerEditBuffer::commitChanges( QStringList& commitErrors )
{
  QgsVectorDataProvider* provider = L->dataProvider();
  commitErrors.clear();

  int cap = provider->capabilities();
  bool success = true;

  QgsFields oldFields = L->pendingFields();

  //
  // delete attributes
  //
  bool attributesChanged = false;
  if ( !mDeletedAttributeIds.isEmpty() )
  {
    if (( cap & QgsVectorDataProvider::DeleteAttributes ) && provider->deleteAttributes( mDeletedAttributeIds.toSet() ) )
    {
      commitErrors << tr( "SUCCESS: %n attribute(s) deleted.", "deleted attributes count", mDeletedAttributeIds.size() );

      emit committedAttributesDeleted( L->id(), mDeletedAttributeIds );

      mDeletedAttributeIds.clear();
      attributesChanged = true;
    }
    else
    {
      commitErrors << tr( "ERROR: %n attribute(s) not deleted.", "not deleted attributes count", mDeletedAttributeIds.size() );
      success = false;
    }
  }

  //
  // add attributes
  //
  if ( !mAddedAttributes.isEmpty() )
  {
    if (( cap & QgsVectorDataProvider::AddAttributes ) && provider->addAttributes( mAddedAttributes ) )
    {
      commitErrors << tr( "SUCCESS: %n attribute(s) added.", "added attributes count", mAddedAttributes.size() );

      emit committedAttributesAdded( L->id(), mAddedAttributes );

      mAddedAttributes.clear();
      attributesChanged = true;
    }
    else
    {
      commitErrors << tr( "ERROR: %n new attribute(s) not added", "not added attributes count", mAddedAttributes.size() );
      success = false;
    }
  }

  //
  // check that addition/removal went as expected
  //
  bool attributeChangesOk = true;
  if ( attributesChanged )
  {
    L->updateFields();
    QgsFields newFields = L->pendingFields();

    if ( oldFields.count() != newFields.count() )
    {
      commitErrors << tr( "ERROR: the count of fields is incorrect after addition/removal of fields!" );
      attributeChangesOk = false;   // don't try attribute updates - they'll fail.
    }

    for ( int i = 0; i < oldFields.count(); ++i )
    {
      const QgsField& oldField = oldFields[i];
      const QgsField& newField = newFields[i];
      if ( attributeChangesOk && oldField != newField )
      {
        commitErrors << tr( "ERROR: field with index %1 is not the same!" ).arg( i );
        attributeChangesOk = false;   // don't try attribute updates - they'll fail.
      }
    }
  }

  if ( attributeChangesOk )
  {
    //
    // change attributes
    //
    if ( !mChangedAttributeValues.isEmpty() )
    {
      if (( cap & QgsVectorDataProvider::ChangeAttributeValues ) && provider->changeAttributeValues( mChangedAttributeValues ) )
      {
        commitErrors << tr( "SUCCESS: %n attribute value(s) changed.", "changed attribute values count", mChangedAttributeValues.size() );

        emit committedAttributeValuesChanges( L->id(), mChangedAttributeValues );

        mChangedAttributeValues.clear();
      }
      else
      {
        commitErrors << tr( "ERROR: %n attribute value change(s) not applied.", "not changed attribute values count", mChangedAttributeValues.size() );
        success = false;
      }
//.........这里部分代码省略.........

bool QgsVectorLayerEditBuffer::commitChanges( QStringList &commitErrors )
{
  QgsVectorDataProvider *provider = L->dataProvider();
  commitErrors.clear();

  int cap = provider->capabilities();
  bool success = true;

  // geometry updates   attribute updates
  // yes                no                    => changeGeometryValues
  // no                 yes                   => changeAttributeValues
  // yes                yes                   => changeFeatures

  // to fix https://issues.qgis.org/issues/15741
  // first of all check if feature to add is compatible with provider type
  // this check have to be done before all checks to avoid to clear internal
  // buffer if some of next steps success.
  if ( success && !mAddedFeatures.isEmpty() )
  {
    if ( cap & QgsVectorDataProvider::AddFeatures )
    {
      if ( provider->doesStrictFeatureTypeCheck() )
      {
        for ( const auto &f : qgis::as_const( mAddedFeatures ) )
        {
          if ( ( ! f.hasGeometry() ) ||
               ( f.geometry().wkbType() == provider->wkbType() ) )
            continue;

          if ( provider->convertToProviderType( f.geometry() ).isNull() )
          {
            commitErrors << tr( "ERROR: %n feature(s) not added - geometry type is not compatible with the current layer.", "not added features count", mAddedFeatures.size() );
            success = false;
            break;
          }
        }
      }
    }
    else
    {
      commitErrors << tr( "ERROR: %n feature(s) not added - provider doesn't support adding features.", "not added features count", mAddedFeatures.size() );
      success = false;
    }
  }

  //
  // update geometries
  //
  if ( !mChangedGeometries.isEmpty() && ( ( cap & QgsVectorDataProvider::ChangeFeatures ) == 0 || mChangedAttributeValues.isEmpty() ) )
  {
    if ( provider->changeGeometryValues( mChangedGeometries ) )
    {
      commitErrors << tr( "SUCCESS: %n geometries were changed.", "changed geometries count", mChangedGeometries.size() );

      emit committedGeometriesChanges( L->id(), mChangedGeometries );
      mChangedGeometries.clear();
    }
    else
    {
      commitErrors << tr( "ERROR: %n geometries not changed.", "not changed geometries count", mChangedGeometries.size() );
      success = false;
    }
  }

  QgsFields oldFields = L->fields();

  //
  // delete attributes
  //
  bool attributesChanged = false;
  if ( !mDeletedAttributeIds.isEmpty() )
  {
    if ( ( cap & QgsVectorDataProvider::DeleteAttributes ) && provider->deleteAttributes( mDeletedAttributeIds.toSet() ) )
    {
      commitErrors << tr( "SUCCESS: %n attribute(s) deleted.", "deleted attributes count", mDeletedAttributeIds.size() );

      emit committedAttributesDeleted( L->id(), mDeletedAttributeIds );

      mDeletedAttributeIds.clear();
      attributesChanged = true;
    }
    else
    {
      commitErrors << tr( "ERROR: %n attribute(s) not deleted.", "not deleted attributes count", mDeletedAttributeIds.size() );
#if 0
      QString list = "ERROR: Pending attribute deletes:";
      Q_FOREACH ( int idx, mDeletedAttributeIds )
      {
        list.append( ' ' + L->fields().at( idx ).name() );
      }
      commitErrors << list;
#endif
      success = false;
    }
  }