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

#include <qgsproviderregistry.h>

Public Types
typedef std::map< QString, QgsProviderMetadata * >	Providers
	Open the given vector data source. 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)
	Returns the components (e.g. More...

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

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

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

Open the given vector data source.

Similar to open(QString const &), except that the user specifies a data provider with which to open the data source instead of using the default data provider that QgsDataManager would figure out to use. This should be useful when (and if) there will exist more than one data provider that can handle a given data source. (E.g., use GDAL to open an SDTS file, or a different data provider that uses sdts++.)

Called by QgsDataManager::open().

Parameters

name	could be a file, URI
provider	is the key for the dataprovider used to open name

Returns: NULL if unable to open vector data source

Temporarily always returns false until finished implementing.

Eventually would be nice if could make QgsDataManager smart enough to figure out whether the given name mapped to a vector, raster, or database source.Type for data provider metadata associative container

Definition at line 225 of file qgsproviderregistry.h.

Member Enumeration Documentation

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 ( )

virtual

Definition at line 275 of file qgsproviderregistry.cpp.

Member Function Documentation

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 NULL on error

Definition at line 379 of file qgsproviderregistry.cpp.

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 515 of file qgsproviderregistry.cpp.

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 481 of file qgsproviderregistry.cpp.

QString QgsProviderRegistry::databaseDrivers ( ) const

virtual

Returns a string containing the available database drivers.

Definition at line 579 of file qgsproviderregistry.cpp.

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

Returns the components (e.g.

file path, layer name) of a provider uri

Parameters

providerKey	identifier of the provider
uri	uri string

Returns: map containing components

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 445 of file qgsproviderregistry.cpp.

QString QgsProviderRegistry::directoryDrivers ( ) const

virtual

Returns a string containing the available directory drivers.

Definition at line 584 of file qgsproviderregistry.cpp.

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 574 of file qgsproviderregistry.cpp.

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 569 of file qgsproviderregistry.cpp.

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

Definition at line 493 of file qgsproviderregistry.cpp.

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

static

Means of accessing canonical single instance.

Definition at line 53 of file qgsproviderregistry.cpp.

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 308 of file qgsproviderregistry.cpp.

QDir QgsProviderRegistry::libraryDirectory ( ) const

Returns the library directory where plugins are found.

Definition at line 361 of file qgsproviderregistry.cpp.

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

Returns list of provider plugins found.

Definition at line 321 of file qgsproviderregistry.cpp.

QString QgsProviderRegistry::protocolDrivers ( ) const

virtual

Returns a string containing the available protocol drivers.

Definition at line 589 of file qgsproviderregistry.cpp.

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

Returns the provider capabilities.

Parameters

providerKey identifier of the provider

Since: QGIS 2.6

Definition at line 461 of file qgsproviderregistry.cpp.

QStringList QgsProviderRegistry::providerList ( ) const

Returns list of available providers by their keys.

Definition at line 594 of file qgsproviderregistry.cpp.

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

Returns metadata of the provider or NULL if not found.

Definition at line 604 of file qgsproviderregistry.cpp.

void QgsProviderRegistry::registerGuis ( QWidget * widget )

Definition at line 533 of file qgsproviderregistry.cpp.

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 548 of file qgsproviderregistry.cpp.

void QgsProviderRegistry::setLibraryDirectory ( const QDir & path )

Sets library directory where to search for plugins.

Definition at line 354 of file qgsproviderregistry.cpp.

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

/build/qgis-3.4.15+24xenial/src/core/qgsproviderregistry.h
/build/qgis-3.4.15+24xenial/src/core/qgsproviderregistry.cpp

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation