Add flag to QgsProviderMetadata to indicate if a provider

can handle file based uris

E.g. gdal/ogr can, but postgres/wfs cannot

(cherry picked from commit 1bef866)

src/app/qgshandlebadlayers.cpp

@@ -29,6 +29,7 @@
 #include "qgslayertreeregistrybridge.h"
 #include "qgsapplication.h"
 #include "qgsfileutils.h"
+#include "qgsprovidermetadata.h"
 
 #include <QDomDocument>
 #include <QDomElement>
@@ -126,9 +127,12 @@ QgsHandleBadLayers::QgsHandleBadLayers( const QList<QDomNode> &layers )
     QString type = node.toElement().attribute( QStringLiteral( "type" ) );
     QString id = node.namedItem( QStringLiteral( "id" ) ).toElement().text();
     QString datasource = node.namedItem( QStringLiteral( "datasource" ) ).toElement().text();
-    QString provider = node.namedItem( QStringLiteral( "provider" ) ).toElement().text();
-    QString vectorProvider = type == QLatin1String( "vector" ) ? provider : tr( "none" );
-    bool providerFileBased = ( provider == QLatin1String( "gdal" ) || provider == QLatin1String( "ogr" ) || provider == QLatin1String( "mdal" ) );
+    const QString provider = node.namedItem( QStringLiteral( "provider" ) ).toElement().text();
+
+    bool providerFileBased = false;
+    if ( const QgsProviderMetadata *metadata = QgsProviderRegistry::instance()->providerMetadata( provider ) )
+      providerFileBased = metadata->providerCapabilities() & QgsProviderMetadata::FileBasedUris;
+
     const QString basepath = QFileInfo( datasource ).absolutePath();
     mOriginalFileBase[ node.namedItem( QStringLiteral( "id" ) ).toElement().text() ].append( basepath );
 

src/core/providers/gdal/qgsgdalprovider.cpp

@@ -3569,6 +3569,11 @@ QList<QPair<QString, QString> > QgsGdalProviderMetadata::pyramidResamplingMethod
   return methods;
 }
 
+QgsProviderMetadata::ProviderCapabilities QgsGdalProviderMetadata::providerCapabilities() const
+{
+  return FileBasedUris;
+}
+
 QList<QgsDataItemProvider *> QgsGdalProviderMetadata::dataItemProviders() const
 {
   QList< QgsDataItemProvider * > providers;

src/core/providers/gdal/qgsgdalprovider.h

@@ -382,6 +382,7 @@ class QgsGdalProviderMetadata final: public QgsProviderMetadata
     QString filters( FilterType type ) override;
     QList< QgsDataItemProvider * > dataItemProviders() const override;
     QList<QPair<QString, QString> > pyramidResamplingMethods() override;
+    ProviderCapabilities providerCapabilities() const override;
 };
 
 ///@endcond

src/core/providers/ogr/qgsogrprovider.cpp

@@ -7277,4 +7277,9 @@ void QgsOgrProviderMetadata::saveConnection( const QgsAbstractProviderConnection
   saveConnectionProtected( conn, name );
 }
 
+QgsProviderMetadata::ProviderCapabilities QgsOgrProviderMetadata::providerCapabilities() const
+{
+  return FileBasedUris;
+}
 ///@endcond
+

src/core/providers/ogr/qgsogrprovider.h

@@ -765,6 +765,7 @@ class QgsOgrProviderMetadata final: public QgsProviderMetadata
     QVariantMap decodeUri( const QString &uri ) const override;
     QString encodeUri( const QVariantMap &parts ) const override;
     QString filters( FilterType type ) override;
+    ProviderCapabilities providerCapabilities() const override;
     bool uriIsBlocklisted( const QString &uri ) const override;
     QgsVectorLayerExporter::ExportError createEmptyLayer(
       const QString &uri,

src/core/qgsprovidermetadata.cpp

@@ -56,6 +56,11 @@ QgsProviderMetadata::ProviderMetadataCapabilities QgsProviderMetadata::capabilit
   return QgsProviderMetadata::ProviderMetadataCapabilities();
 }
 
+QgsProviderMetadata::ProviderCapabilities QgsProviderMetadata::providerCapabilities() const
+{
+  return QgsProviderMetadata::ProviderCapabilities();
+}
+
 QString QgsProviderMetadata::library() const
 {
   return mLibrary;

src/core/qgsprovidermetadata.h

@@ -153,6 +153,17 @@ class CORE_EXPORT QgsProviderMetadata : public QObject
     };
     Q_DECLARE_FLAGS( ProviderMetadataCapabilities, ProviderMetadataCapability )
 
+    /**
+     * Provider capabilities
+     *
+     * \since QGIS 3.20
+     */
+    enum ProviderCapability
+    {
+      FileBasedUris = 1 << 0, //!< Indicates that the provider can utilise URIs which are based on paths to files (as opposed to database or internet paths)
+    };
+    Q_DECLARE_FLAGS( ProviderCapabilities, ProviderCapability )
+
     /**
      * Typedef for data provider creation function.
      * \since QGIS 3.0
@@ -199,6 +210,13 @@ class CORE_EXPORT QgsProviderMetadata : public QObject
      */
     virtual QgsProviderMetadata::ProviderMetadataCapabilities capabilities() const;
 
+    /**
+     * Returns the provider's capabilities.
+     *
+     * \since QGIS 3.20
+     */
+    virtual QgsProviderMetadata::ProviderCapabilities providerCapabilities() const;
+
     /**
      * This returns the library file name
      *

src/providers/mdal/qgsmdalprovider.cpp

@@ -981,6 +981,11 @@ QString QgsMdalProviderMetadata::encodeUri( const QVariantMap &parts ) const
   return path;
 }
 
+QgsProviderMetadata::ProviderCapabilities QgsMdalProviderMetadata::providerCapabilities() const
+{
+  return FileBasedUris;
+}
+
 QString QgsMdalProviderMetadata::filters( FilterType type )
 {
   switch ( type )

src/providers/mdal/qgsmdalprovider.h

@@ -145,6 +145,7 @@ class QgsMdalProviderMetadata: public QgsProviderMetadata
                          const QgsCoordinateReferenceSystem &crs ) const override;
     QVariantMap decodeUri( const QString &uri ) const override;
     QString encodeUri( const QVariantMap &parts ) const override;
+    ProviderCapabilities providerCapabilities() const override;
 };
 
 #endif //QGSMDALPROVIDER_H