A registry / canonical manager of data providers. More...

#include <qgsproviderregistry.h>

Public Types
typedef std::map< QString, QgsProviderMetadata * >	Providers
	Type for data provider metadata associative container. More...

enum	WidgetMode { None, Embedded, Manager }
	Different ways a source select dialog can be used (embedded is for the data source manager dialog) More...

Public Member Functions
virtual	~QgsProviderRegistry ()

QgsDataProvider *	createProvider (const QString &providerKey, const QString &dataSource, const QgsDataProvider::ProviderOptions &options=QgsDataProvider::ProviderOptions())
	Creates a new instance of a provider. More...

QLibrary *	createProviderLibrary (const QString &providerKey) const
	Returns a new QLibrary for the specified providerKey. More...

QWidget *	createSelectionWidget (const QString &providerKey, QWidget *parent=nullptr, Qt::WindowFlags fl=Qt::WindowFlags(), QgsProviderRegistry::WidgetMode widgetMode=QgsProviderRegistry::WidgetMode::None)
	Returns a new widget for selecting layers from a provider. More...

virtual QString	databaseDrivers () const
	Returns a string containing the available database drivers. More...

QVariantMap	decodeUri (const QString &providerKey, const QString &uri)
	Breaks a provider data source URI into its component paths (e.g. More...

virtual QString	directoryDrivers () const
	Returns a string containing the available directory drivers. More...

virtual QString	fileMeshDatasetFilters () const
	Returns mesh's dataset file filter string. More...

virtual QString	fileMeshFilters () const
	Returns mesh file filter string. More...

virtual QString	fileRasterFilters () const
	Returns raster file filter string. More...

virtual QString	fileVectorFilters () const
	Returns vector file filter string. More...

QFunctionPointer	function (const QString &providerKey, const QString &functionName)
	Gets pointer to provider function. More...

QString	library (const QString &providerKey) const
	Returns path for the library of the provider. More...

QDir	libraryDirectory () const
	Returns the library directory where plugins are found. More...

QString	pluginList (bool asHtml=false) const
	Returns list of provider plugins found. More...

virtual QString	protocolDrivers () const
	Returns a string containing the available protocol drivers. More...

int	providerCapabilities (const QString &providerKey) const
	Returns the provider capabilities. More...

QStringList	providerList () const
	Returns list of available providers by their keys. More...

const QgsProviderMetadata *	providerMetadata (const QString &providerKey) const
	Returns metadata of the provider or `nullptr` if not found. More...

void	registerGuis (QWidget *widget)

bool	registerProvider (QgsProviderMetadata *providerMetadata)
	register a new vector data provider from its providerMetadata More...

void	setLibraryDirectory (const QDir &path)
	Sets library directory where to search for plugins. More...

Static Public Member Functions
static QgsProviderRegistry *	instance (const QString &pluginPath=QString())
	Means of accessing canonical single instance. More...

Friends
class	QgsApplication

Detailed Description

A registry / canonical manager of data providers.

This is a Singleton class that manages data provider access.

Providers can be either loaded via libraries or native providers that are included in the core QGIS installation and accessed through function pointers.

Loaded providers may be restricted using QGIS_PROVIDER_FILE environment variable. QGIS_PROVIDER_FILE is regexp pattern applied to provider file name (not provider key). For example, if the variable is set to gdal|ogr|postgres it will load only providers gdal, ogr and postgres.

Definition at line 52 of file qgsproviderregistry.h.

Member Typedef Documentation

◆ Providers

typedef std::map<QString, QgsProviderMetadata *> QgsProviderRegistry::Providers

Type for data provider metadata associative container.

Definition at line 231 of file qgsproviderregistry.h.

Member Enumeration Documentation

◆ WidgetMode

enum QgsProviderRegistry::WidgetMode

Different ways a source select dialog can be used (embedded is for the data source manager dialog)

Enumerator
None
Embedded
Manager

Definition at line 61 of file qgsproviderregistry.h.

Constructor & Destructor Documentation

◆ ~QgsProviderRegistry()

QgsProviderRegistry::~QgsProviderRegistry ( )

virtual

Definition at line 299 of file qgsproviderregistry.cpp.

Member Function Documentation

◆ createProvider()

QgsDataProvider * QgsProviderRegistry::createProvider	(	const QString &	providerKey,
		const QString &	dataSource,
		const QgsDataProvider::ProviderOptions &	options = `QgsDataProvider::ProviderOptions()`
	)

Creates a new instance of a provider.

Parameters

providerKey	identifier of the provider
dataSource	string containing data source for the provider
options	provider options

Returns: new instance of provider or nullptr on error

Definition at line 403 of file qgsproviderregistry.cpp.

◆ createProviderLibrary()

QLibrary * QgsProviderRegistry::createProviderLibrary ( const QString & providerKey ) const

Returns a new QLibrary for the specified providerKey.

Ownership of the returned object is transferred to the caller and the caller is responsible for deleting it.

If the provider uses direct provider function pointers instead of a library nullptr will be returned.

Definition at line 539 of file qgsproviderregistry.cpp.

◆ createSelectionWidget()

QWidget * QgsProviderRegistry::createSelectionWidget	(	const QString &	providerKey,
		QWidget *	parent = `nullptr`,
		Qt::WindowFlags	fl = `Qt::WindowFlags()`,
		QgsProviderRegistry::WidgetMode	widgetMode = `QgsProviderRegistry::WidgetMode::None`
	)

Returns a new widget for selecting layers from a provider.

Either the parent widget must be set or the caller becomes responsible for deleting the returned widget.

Definition at line 505 of file qgsproviderregistry.cpp.

◆ databaseDrivers()

QString QgsProviderRegistry::databaseDrivers ( ) const

virtual

Returns a string containing the available database drivers.

Definition at line 614 of file qgsproviderregistry.cpp.

◆ decodeUri()

QVariantMap QgsProviderRegistry::decodeUri	(	const QString &	providerKey,
		const QString &	uri
	)

Breaks a provider data source URI into its component paths (e.g.

file path, layer name).

Parameters

providerKey	identifier of the provider
uri	uri string

Returns: map containing components. Standard components include "path", "layerName", "url".

Note: this function may not be supported by all providers, an empty map will be returned in such case

Since: QGIS 3.4

Definition at line 469 of file qgsproviderregistry.cpp.

◆ directoryDrivers()

QString QgsProviderRegistry::directoryDrivers ( ) const

virtual

Returns a string containing the available directory drivers.

Definition at line 619 of file qgsproviderregistry.cpp.

◆ fileMeshDatasetFilters()

QString QgsProviderRegistry::fileMeshDatasetFilters ( ) const

virtual

Returns mesh's dataset file filter string.

Returns a string suitable for a QFileDialog of mesh datasets file formats supported by all data providers.

This walks through all data providers appending calls to their fileMeshFilters to a string, which is then returned.

See also: fileMeshFilters()

Since: QGIS 3.6

Definition at line 609 of file qgsproviderregistry.cpp.

◆ fileMeshFilters()

QString QgsProviderRegistry::fileMeshFilters ( ) const

virtual

Returns mesh file filter string.

Returns a string suitable for a QFileDialog of mesh file formats supported by all data providers.

This walks through all data providers appending calls to their fileMeshFilters to a string, which is then returned.

See also: fileMeshDatasetFilters()

Since: QGIS 3.6

Definition at line 604 of file qgsproviderregistry.cpp.

◆ fileRasterFilters()

QString QgsProviderRegistry::fileRasterFilters ( ) const

virtual

Returns raster file filter string.

Returns a string suitable for a QFileDialog of raster file formats supported by all data providers.

This walks through all data providers appending calls to their buildSupportedRasterFileFilter to a string, which is then returned.

Note: This replaces QgsRasterLayer::buildSupportedRasterFileFilter()

Definition at line 599 of file qgsproviderregistry.cpp.

◆ fileVectorFilters()

QString QgsProviderRegistry::fileVectorFilters ( ) const

virtual

Returns vector file filter string.

Returns a string suitable for a QFileDialog of vector file formats supported by all data providers.

This walks through all data providers appending calls to their fileVectorFilters to a string, which is then returned.

Note

It'd be nice to eventually be raster/vector neutral.

Definition at line 594 of file qgsproviderregistry.cpp.

◆ function()

QFunctionPointer QgsProviderRegistry::function	(	const QString &	providerKey,
		const QString &	functionName
	)

Gets pointer to provider function.

Parameters

providerKey	identifier of the provider
functionName	name of function

Returns: pointer to function or nullptr on error. If the provider uses direct provider function pointers instead of a library nullptr will be returned.

Definition at line 517 of file qgsproviderregistry.cpp.

◆ instance()

QgsProviderRegistry * QgsProviderRegistry::instance ( const QString & pluginPath = QString() )

static

Means of accessing canonical single instance.

Definition at line 54 of file qgsproviderregistry.cpp.

◆ library()

QString QgsProviderRegistry::library ( const QString & providerKey ) const

Returns path for the library of the provider.

If the provider uses direct provider function pointers instead of a library an empty string will be returned.

Definition at line 332 of file qgsproviderregistry.cpp.

◆ libraryDirectory()

QDir QgsProviderRegistry::libraryDirectory ( ) const

Returns the library directory where plugins are found.

Definition at line 385 of file qgsproviderregistry.cpp.

◆ pluginList()

QString QgsProviderRegistry::pluginList ( bool asHtml = false ) const

Returns list of provider plugins found.

Definition at line 345 of file qgsproviderregistry.cpp.

◆ protocolDrivers()

QString QgsProviderRegistry::protocolDrivers ( ) const

virtual

Returns a string containing the available protocol drivers.

Definition at line 624 of file qgsproviderregistry.cpp.

◆ providerCapabilities()

int QgsProviderRegistry::providerCapabilities ( const QString & providerKey ) const

Returns the provider capabilities.

Parameters

providerKey identifier of the provider

Since: QGIS 2.6

Definition at line 485 of file qgsproviderregistry.cpp.

◆ providerList()

QStringList QgsProviderRegistry::providerList ( ) const

Returns list of available providers by their keys.

Definition at line 629 of file qgsproviderregistry.cpp.

◆ providerMetadata()

const QgsProviderMetadata * QgsProviderRegistry::providerMetadata ( const QString & providerKey ) const

Returns metadata of the provider or nullptr if not found.

Definition at line 639 of file qgsproviderregistry.cpp.

◆ registerGuis()

void QgsProviderRegistry::registerGuis ( QWidget * widget )

Definition at line 557 of file qgsproviderregistry.cpp.

◆ registerProvider()

bool QgsProviderRegistry::registerProvider ( QgsProviderMetadata * providerMetadata )

register a new vector data provider from its providerMetadata

Returns: true on success, false if a provider with the same key was already registered

Note: ownership of the QgsProviderMetadata instance is transferred to the registry

Since: QGIS 3.2

Definition at line 573 of file qgsproviderregistry.cpp.

◆ setLibraryDirectory()

void QgsProviderRegistry::setLibraryDirectory ( const QDir & path )

Sets library directory where to search for plugins.

Definition at line 378 of file qgsproviderregistry.cpp.

Friends And Related Function Documentation

◆ QgsApplication

friend class QgsApplication

friend

Definition at line 304 of file qgsproviderregistry.h.

The documentation for this class was generated from the following files:

/tmp/buildd/qgis-3.8.0+99unstable/src/core/qgsproviderregistry.h
/tmp/buildd/qgis-3.8.0+99unstable/src/core/qgsproviderregistry.cpp

Public Types

Public Member Functions

Static Public Member Functions

Friends

Detailed Description

Member Typedef Documentation

◆ Providers

Member Enumeration Documentation

◆ WidgetMode

Constructor & Destructor Documentation

◆ ~QgsProviderRegistry()

Member Function Documentation

◆ createProvider()

◆ createProviderLibrary()

◆ createSelectionWidget()

◆ databaseDrivers()

◆ decodeUri()

◆ directoryDrivers()

◆ fileMeshDatasetFilters()

◆ fileMeshFilters()

◆ fileRasterFilters()

◆ fileVectorFilters()

◆ function()

◆ instance()

◆ library()

◆ libraryDirectory()

◆ pluginList()

◆ protocolDrivers()

◆ providerCapabilities()

◆ providerList()

◆ providerMetadata()

◆ registerGuis()

◆ registerProvider()

◆ setLibraryDirectory()

Friends And Related Function Documentation

◆ QgsApplication