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"""
***************************************************************************
providermetadata.py
---------------------
Date : June 2019
Copyright : (C) 2019 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
from qgis._core import QgsProviderMetadata
class PyProviderMetadata(QgsProviderMetadata):
"""wrapper around QgsProviderMetadata to keep the existing Python code running which registers
data providers by passing a custom python createProvider() function to QgsProviderMetadata
constructor. The proper new way of doing it is to subclass QgsProviderMetadata and implement
its virtual functions.
TODO: QGIS 4 - remove this wrapper (only subclassing of QgsProviderMetadata should be used)
"""
# this is a workaround to keep references to metadata classes
# so they are not removed when the variable gets out of scope
_kept_refs = []
def __init__(self, key, description, library_or_create_func=None):
super().__init__(key, description)
if callable(library_or_create_func):
self.createProvider = library_or_create_func
PyProviderMetadata._kept_refs.append(self)
PyProviderMetadata.__doc__ = QgsProviderMetadata.__doc__
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