16#include <QMutexLocker>
21#define SUBLAYER_SEPARATOR QStringLiteral( "!!::!!" )
25 : mDataSourceURI( uri ),
26 mOptions( providerOptions )
87 Q_UNUSED( updateFeatureCount )
106 reloadProviderData();
114 mProviderProperties.insert( property, value );
121 mProviderProperties.insert( property, value );
128 return mProviderProperties.value( property, defaultValue );
135 return mProviderProperties.value( property, defaultValue );
142 Q_UNUSED( isListening )
156 const QMutexLocker locker( &mOptionsMutex );
164 const QMutexLocker locker( &mOptionsMutex );
QFlags< DataProviderFlag > DataProviderFlags
Data provider flags.
QFlags< DataProviderReadFlag > DataProviderReadFlags
Flags which control data provider construction.
QFlags< ProviderStyleStorageCapability > ProviderStyleStorageCapabilities
Contains information about the context in which a coordinate transform is executed.
Base class for handling elevation related properties for a data provider.
Base class for handling properties relating to a data provider's temporal capabilities.
virtual QString subsetString() const
Returns the subset definition string currently in use by the layer and used by the provider to limit ...
QgsCoordinateTransformContext transformContext() const
Returns data provider coordinate transform context.
virtual void setListening(bool isListening)
Set whether the provider will listen to datasource notifications If set, the provider will issue noti...
virtual Qgis::DataProviderFlags flags() const
Returns the generic data provider flags.
void setProviderProperty(ProviderProperty property, const QVariant &value)
Allows setting arbitrary properties on the provider.
virtual bool supportsSubsetString() const
Returns true if the provider supports setting of subset strings.
void dataChanged()
Emitted whenever a change is made to the data provider which may have caused changes in the provider'...
virtual QString subsetStringHelpUrl() const
Returns a URL pointing to documentation describing the dialect which is supported for subset strings ...
virtual Qgis::ProviderStyleStorageCapabilities styleStorageCapabilities() const
Returns the style storage capabilities.
ProviderProperty
Properties are used to pass custom configuration options into data providers.
QgsDataProvider(const QString &uri=QString(), const QgsDataProvider::ProviderOptions &providerOptions=QgsDataProvider::ProviderOptions(), Qgis::DataProviderReadFlags flags=Qgis::DataProviderReadFlags())
Create a new dataprovider with the specified in the uri.
virtual QgsDataProviderTemporalCapabilities * temporalCapabilities()
Returns the provider's temporal capabilities.
virtual bool setSubsetString(const QString &subset, bool updateFeatureCount=true)
Set the subset string used to create a subset of features in the layer.
static QString sublayerSeparator()
String sequence used for separating components of sublayers strings.
QVariant providerProperty(ProviderProperty property, const QVariant &defaultValue=QVariant()) const
Gets the current value of a certain provider property.
virtual QString subsetStringDialect() const
Returns a user-friendly string describing the dialect which is supported for subset strings by the pr...
Qgis::DataProviderReadFlags mReadFlags
Read flags. It's up to the subclass to respect these when needed.
virtual QString htmlMetadata() const
Obtain a formatted HTML string containing assorted metadata for this data provider.
virtual QgsDataProviderElevationProperties * elevationProperties()
Returns the provider's elevation properties.
virtual bool renderInPreview(const QgsDataProvider::PreviewContext &context)
Returns whether the layer must be rendered in preview jobs.
virtual void reloadData()
Reloads the data from the source for providers with data caches to synchronize, changes in the data s...
virtual void setTransformContext(const QgsCoordinateTransformContext &transformContext)
Sets data coordinate transform context to transformContext.
#define SUBLAYER_SEPARATOR
#define QGIS_PROTECT_QOBJECT_THREAD_ACCESS_NON_FATAL
#define QGIS_PROTECT_QOBJECT_THREAD_ACCESS
Stores settings related to the context in which a preview job runs.
double maxRenderingTimeMs
Default maximum allowable render time, in ms.
double lastRenderingTimeMs
Previous rendering time for the layer, in ms.
Setting options for creating vector data providers.
QgsCoordinateTransformContext transformContext
Coordinate transform context.