From 839a88903896441d09664bbf49bb36114d72a81f Mon Sep 17 00:00:00 2001
From: Alessandro Pasotti <elpaso@itopen.it>
Date: Thu, 19 Apr 2018 19:23:59 +0200
Subject: [PATCH] SIP wrappers for QgsProviderMetadata

---
 .../auto_generated/qgsprovidermetadata.sip.in | 48 +++++++++++++++++++
 src/core/qgsprovidermetadata.h                | 43 ++++++++++++++++-
 2 files changed, 90 insertions(+), 1 deletion(-)

diff --git a/python/core/auto_generated/qgsprovidermetadata.sip.in b/python/core/auto_generated/qgsprovidermetadata.sip.in
index 2ba01a047058..96e4873c1a72 100644
--- a/python/core/auto_generated/qgsprovidermetadata.sip.in
+++ b/python/core/auto_generated/qgsprovidermetadata.sip.in
@@ -36,6 +36,54 @@ library object.
 
     QgsProviderMetadata( const QString &_key, const QString &_description, const QString &_library );
 
+    QgsProviderMetadata( const QString &key, const QString &description, SIP_PYCALLABLE / AllowNone / );
+%Docstring
+Metadata for provider with direct provider creation function pointer, where
+no library is involved.
+
+.. versionadded:: 3.0
+
+.. note::
+
+   not available in Python bindings
+%End
+%MethodCode
+
+    // Make sure the callable doesn't get garbage collected
+    Py_INCREF( a2 );
+
+    Py_BEGIN_ALLOW_THREADS
+
+    sipCpp = new QgsProviderMetadata( *a0, *a1, [a2]( const QString &dataSource ) -> QgsDataProvider*
+    {
+      QgsDataProvider *provider;
+      provider = nullptr;
+      PyObject *sipResObj;
+      SIP_BLOCK_THREADS
+
+      sipResObj = sipCallMethod( NULL, a2, "N", new QString( dataSource ), sipType_QString, NULL );
+      Py_DECREF( a2 );
+      if ( sipResObj )
+      {
+        // Py_DECREF(sipResObj);
+        if ( sipCanConvertToType( sipResObj, sipType_QgsDataProvider, SIP_NOT_NONE ) )
+        {
+          int state0;
+          int sipIsErr = 0;
+          provider = reinterpret_cast<QgsDataProvider *>( sipConvertToType( sipResObj, sipType_QgsDataProvider, NULL, SIP_NOT_NONE, &state0, &sipIsErr ) );
+          if ( sipIsErr != 0 )
+          {
+            provider = nullptr;
+          }
+        }
+      }
+      SIP_UNBLOCK_THREADS
+      return provider;
+    } );
+
+    Py_END_ALLOW_THREADS
+
+%End
 
     QString key() const;
 %Docstring
diff --git a/src/core/qgsprovidermetadata.h b/src/core/qgsprovidermetadata.h
index 121b024d0b8c..7522585af637 100644
--- a/src/core/qgsprovidermetadata.h
+++ b/src/core/qgsprovidermetadata.h
@@ -61,7 +61,48 @@ class CORE_EXPORT QgsProviderMetadata
      * \note not available in Python bindings
      * \since QGIS 3.0
      */
-    SIP_SKIP QgsProviderMetadata( const QString &key, const QString &description, const QgsProviderMetadata::CreateDataProviderFunction &createFunc );
+#ifndef SIP_RUN
+    QgsProviderMetadata( const QString &key, const QString &description, const QgsProviderMetadata::CreateDataProviderFunction &createFunc );
+#else
+    QgsProviderMetadata( const QString &key, const QString &description, SIP_PYCALLABLE / AllowNone / );
+    % MethodCode
+
+    // Make sure the callable doesn't get garbage collected
+    Py_INCREF( a2 );
+
+    Py_BEGIN_ALLOW_THREADS
+
+    sipCpp = new QgsProviderMetadata( *a0, *a1, [a2]( const QString &dataSource ) -> QgsDataProvider*
+    {
+      QgsDataProvider *provider;
+      provider = nullptr;
+      PyObject *sipResObj;
+      SIP_BLOCK_THREADS
+
+      sipResObj = sipCallMethod( NULL, a2, "N", new QString( dataSource ), sipType_QString, NULL );
+      Py_DECREF( a2 );
+      if ( sipResObj )
+      {
+        // Py_DECREF(sipResObj);
+        if ( sipCanConvertToType( sipResObj, sipType_QgsDataProvider, SIP_NOT_NONE ) )
+        {
+          int state0;
+          int sipIsErr = 0;
+          provider = reinterpret_cast<QgsDataProvider *>( sipConvertToType( sipResObj, sipType_QgsDataProvider, NULL, SIP_NOT_NONE, &state0, &sipIsErr ) );
+          if ( sipIsErr != 0 )
+          {
+            provider = nullptr;
+          }
+        }
+      }
+      SIP_UNBLOCK_THREADS
+      return provider;
+    } );
+
+    Py_END_ALLOW_THREADS
+
+    % End
+#endif
 
     /**
      * This returns the unique key associated with the provider