mirror of
https://github.com/qgis/QGIS.git
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406 lines
11 KiB
Plaintext
406 lines
11 KiB
Plaintext
/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/qgsdataprovider.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
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************************************************************************/
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class QgsDataProvider : QObject
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{
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%Docstring
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Abstract base class for spatial data provider implementations.
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This object needs to inherit from QObject to enable event
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processing in the Postgres/PostGIS provider (QgsPostgresProvider).
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It is called *here* so that this vtable and the vtable for
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QgsPostgresProvider don't get misaligned -
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the QgsVectorLayer class factory (which refers
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to generic QgsVectorDataProvider's) depends on it.
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%End
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%TypeHeaderCode
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#include "qgsdataprovider.h"
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%End
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%ConvertToSubClassCode
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if ( qobject_cast<QgsVectorDataProvider *>( sipCpp ) )
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{
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sipType = sipType_QgsVectorDataProvider;
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}
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else if ( qobject_cast<QgsRasterDataProvider *>( sipCpp ) )
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{
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sipType = sipType_QgsRasterDataProvider;
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}
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else
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{
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sipType = 0;
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}
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%End
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public:
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enum DataCapability
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{
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NoDataCapabilities,
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File,
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Dir,
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Database,
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Net
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};
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enum ProviderProperty
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{
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EvaluateDefaultValues,
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CustomData
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};
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QgsDataProvider( const QString &uri = QString() );
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%Docstring
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Create a new dataprovider with the specified in the ``uri``.
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%End
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virtual QgsCoordinateReferenceSystem crs() const = 0;
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%Docstring
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Returns the coordinate system for the data source.
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If the provider isn't capable of returning its projection then an invalid
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QgsCoordinateReferenceSystem will be returned.
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:rtype: QgsCoordinateReferenceSystem
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%End
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virtual void setDataSourceUri( const QString &uri );
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%Docstring
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Set the data source specification. This may be a path or database
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connection string
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\param uri source specification
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%End
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virtual QString dataSourceUri( bool expandAuthConfig = false ) const;
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%Docstring
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Get the data source specification. This may be a path or database
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connection string
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\param expandAuthConfig Whether to expand any assigned authentication configuration
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:return: data source specification
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.. note::
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The default authentication configuration expansion is FALSE. This keeps credentials
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out of layer data source URIs and project files. Expansion should be specifically done
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only when needed within a provider
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:rtype: str
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%End
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void setUri( const QgsDataSourceUri &uri );
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%Docstring
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Set the data source specification.
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.. versionadded:: 3.0
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%End
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QgsDataSourceUri uri() const;
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%Docstring
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Get the data source specification.
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.. versionadded:: 3.0
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:rtype: QgsDataSourceUri
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%End
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virtual QgsRectangle extent() const = 0;
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%Docstring
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Returns the extent of the layer
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:return: QgsRectangle containing the extent of the layer
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:rtype: QgsRectangle
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%End
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virtual bool isValid() const = 0;
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%Docstring
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Returns true if this is a valid layer. It is up to individual providers
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to determine what constitutes a valid layer.
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:rtype: bool
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%End
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virtual void updateExtents();
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%Docstring
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Update the extents of the layer. Not implemented by default.
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%End
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virtual bool setSubsetString( const QString &subset, bool updateFeatureCount = true );
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%Docstring
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Set the subset string used to create a subset of features in
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the layer. This may be a sql where clause or any other string
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that can be used by the data provider to create a subset.
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Must be implemented in the dataprovider.
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:rtype: bool
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%End
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virtual bool supportsSubsetString() const;
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%Docstring
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Returns true if the provider supports setting of subset strings.
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:rtype: bool
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%End
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virtual QString subsetString() const;
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%Docstring
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Returns the subset definition string (typically sql) currently in
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use by the layer and used by the provider to limit the feature set.
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Must be overridden in the dataprovider, otherwise returns a null
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QString.
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:rtype: str
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%End
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virtual QStringList subLayers() const;
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%Docstring
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Sub-layers handled by this provider, in order from bottom to top
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Sub-layers are used when the provider's source can combine layers
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it knows about in some way before it hands them off to the provider.
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:rtype: list of str
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%End
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virtual QStringList subLayerStyles() const;
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%Docstring
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Sub-layer styles for each sub-layer handled by this provider,
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in order from bottom to top
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Sub-layer styles are used to abstract the way the provider's source can symbolise
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layers in some way at the server, before it serves them to the provider.
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:rtype: list of str
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%End
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virtual uint subLayerCount() const;
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%Docstring
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return the number of layers for the current data source
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:rtype: uint
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%End
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virtual void setLayerOrder( const QStringList &layers );
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%Docstring
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Reorder the list of layer names to be rendered by this provider
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(in order from bottom to top)
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.. note::
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layers must have been previously added.
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%End
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virtual void setSubLayerVisibility( const QString &name, bool vis );
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%Docstring
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Set the visibility of the given sublayer name
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%End
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virtual QString name() const = 0;
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%Docstring
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Return a provider name
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Essentially just returns the provider key. Should be used to build file
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dialogs so that providers can be shown with their supported types. Thus
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if more than one provider supports a given format, the user is able to
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select a specific provider to open that file.
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\note
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Instead of being pure virtual, might be better to generalize this
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behavior and presume that none of the sub-classes are going to do
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anything strange with regards to their name or description?
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:rtype: str
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%End
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virtual QString description() const = 0;
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%Docstring
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Return description
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Return a terse string describing what the provider is.
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\note
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Instead of being pure virtual, might be better to generalize this
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behavior and presume that none of the sub-classes are going to do
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anything strange with regards to their name or description?
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:rtype: str
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%End
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virtual QString fileVectorFilters() const;
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%Docstring
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Return vector file filter string
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Returns a string suitable for a QFileDialog of vector file formats
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supported by the data provider. Naturally this will be an empty string
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for those data providers that do not deal with plain files, such as
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databases and servers.
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.. note::
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It'd be nice to eventually be raster/vector neutral.
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:rtype: str
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%End
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virtual QString fileRasterFilters() const;
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%Docstring
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Return raster file filter string
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Returns a string suitable for a QFileDialog of raster file formats
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supported by the data provider. Naturally this will be an empty string
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for those data providers that do not deal with plain files, such as
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databases and servers.
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.. note::
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It'd be nice to eventually be raster/vector neutral.
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:rtype: str
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%End
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virtual void reloadData();
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%Docstring
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Reloads the data from the source. Needs to be implemented by providers with data caches to
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synchronize with changes in the data source
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%End
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virtual QDateTime timestamp() const;
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%Docstring
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Time stamp of data source in the moment when data/metadata were loaded by provider
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:rtype: QDateTime
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%End
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virtual QDateTime dataTimestamp() const;
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%Docstring
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Current time stamp of data source
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:rtype: QDateTime
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%End
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virtual QgsError error() const;
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%Docstring
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Get current status error. This error describes some principal problem
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for which provider cannot work and thus is not valid. It is not last error
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after accessing data by block(), identify() etc.
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:rtype: QgsError
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%End
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virtual void invalidateConnections( const QString &connection );
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%Docstring
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Invalidate connections corresponding to specified name
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.. versionadded:: 2.16
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%End
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virtual bool enterUpdateMode();
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%Docstring
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Enter update mode.
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This is aimed at providers that can open differently the connection to
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the datasource, according it to be in update mode or in read-only mode.
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A call to this method shall be balanced with a call to leaveUpdateMode(),
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if this method returns true.
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Most providers will have an empty implementation for that method.
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For backward compatibility, providers that implement enterUpdateMode() should
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still make sure to allow editing operations to work even if enterUpdateMode()
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is not explicitly called.
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Several successive calls to enterUpdateMode() can be done. So there is
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a concept of stack of calls that must be handled by the provider. Only the first
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call to enterUpdateMode() will really turn update mode on.
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:return: true in case of success (or no-op implementation), false in case of failure.
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.. versionadded:: 2.16
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:rtype: bool
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%End
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virtual bool leaveUpdateMode();
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%Docstring
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Leave update mode.
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This is aimed at providers that can open differently the connection to
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the datasource, according it to be in update mode or in read-only mode.
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This method shall be balanced with a successful call to enterUpdateMode().
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Most providers will have an empty implementation for that method.
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Several successive calls to enterUpdateMode() can be done. So there is
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a concept of stack of calls that must be handled by the provider. Only the last
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call to leaveUpdateMode() will really turn update mode off.
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:return: true in case of success (or no-op implementation), false in case of failure.
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.. versionadded:: 2.16
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:rtype: bool
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%End
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void setProviderProperty( ProviderProperty property, const QVariant &value );
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%Docstring
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Allows setting arbitrary properties on the provider.
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It depends on the provider which properties are supported.
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.. versionadded:: 2.16
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%End
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QVariant providerProperty( ProviderProperty property, const QVariant &defaultValue = QVariant() ) const;
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%Docstring
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Get the current value of a certain provider property.
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It depends on the provider which properties are supported.
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.. versionadded:: 2.16
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:rtype: QVariant
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%End
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signals:
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void fullExtentCalculated();
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%Docstring
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This is emitted whenever the worker thread has fully calculated the
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PostGIS extents for this layer, and its event has been received by this
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provider.
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%End
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void dataChanged();
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%Docstring
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This is emitted whenever an asynchronous operation has finished
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and the data should be redrawn
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When emitted from a QgsVectorDataProvider, any cached information such as
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feature ids should be invalidated.
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%End
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protected:
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void appendError( const QgsErrorMessage &message );
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%Docstring
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Add error message
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%End
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void setError( const QgsError &error );
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%Docstring
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Set error message
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%End
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};
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/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/qgsdataprovider.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
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************************************************************************/
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