QGIS API Documentation  2.18.21-Las Palmas (9fba24a)
Public Member Functions | List of all members
QgsProviderMetadata Class Reference

Holds data provider key, description, and associated shared library file information. More...

#include <qgsprovidermetadata.h>

Public Member Functions

 QgsProviderMetadata (const QString &_key, const QString &_description, const QString &_library)
 
QString description () const
 This returns descriptive text for the provider. More...
 
QString key () const
 This returns the unique key associated with the provider. More...
 
QString library () const
 This returns the library file name. More...
 

Detailed Description

Holds data provider key, description, and associated shared library file information.

The metadata class is used in a lazy load implementation in QgsProviderRegistry. To save memory, data providers are only actually loaded via QLibrary calls if they're to be used. (Though they're all iteratively loaded once to get their metadata information, and then unloaded when the QgsProviderRegistry is created.) QgsProviderMetadata supplies enough information to be able to later load the associated shared library object.

Definition at line 37 of file qgsprovidermetadata.h.

Constructor & Destructor Documentation

◆ QgsProviderMetadata()

QgsProviderMetadata::QgsProviderMetadata ( const QString _key,
const QString _description,
const QString _library 
)

Definition at line 23 of file qgsprovidermetadata.cpp.

Member Function Documentation

◆ description()

QString QgsProviderMetadata::description ( ) const

This returns descriptive text for the provider.

This is used to provide a descriptive list of available data providers.

Definition at line 36 of file qgsprovidermetadata.cpp.

◆ key()

QString QgsProviderMetadata::key ( ) const

This returns the unique key associated with the provider.

This key string is used for the associative container in QgsProviderRegistry

Definition at line 31 of file qgsprovidermetadata.cpp.

◆ library()

QString QgsProviderMetadata::library ( ) const

This returns the library file name.

This is used to QLibrary calls to load the data provider.

Definition at line 41 of file qgsprovidermetadata.cpp.


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