Move invalid geometry callback from Python to c++

Author: nyalldawson

python/core/processing/qgsprocessingcontext.sip

@@ -137,6 +137,8 @@ Destination project
     void setInvalidGeometryCheck( const QgsFeatureRequest::InvalidGeometryCheck &check );
 %Docstring
  Sets the behavior used for checking invalid geometries in input layers.
+ Settings this to anything but QgsFeatureRequest.GeometryNoCheck will also
+ reset the invalidGeometryCallback() to a default implementation.
 .. seealso:: invalidGeometryCheck()
 %End
 

python/plugins/processing/tools/dataobjects.py

@@ -77,12 +77,6 @@ def createContext():
         invalid_features_method = QgsFeatureRequest.GeometryAbortOnInvalid
     context.setInvalidGeometryCheck(invalid_features_method)
 
-    def raise_error(f):
-        raise GeoAlgorithmExecutionException(QCoreApplication.translate("FeatureIterator",
-                                                                        'Features with invalid geometries found. Please fix these geometries or specify the "Ignore invalid input features" flag'))
-
-    context.setInvalidGeometryCallback(raise_error)
-
     def raise_transform_error(f):
         raise GeoAlgorithmExecutionException(QCoreApplication.translate("FeatureIterator",
                                                                         'Encountered a transform error when reprojecting feature with id {}.'.format(f.id())))

src/core/processing/qgsprocessingcontext.h

@@ -24,6 +24,7 @@
 #include "qgsexpressioncontext.h"
 #include "qgsfeaturerequest.h"
 #include "qgsmaplayerlistutils.h"
+#include "qgsprocessingexception.h"
 
 /**
  * \class QgsProcessingContext
@@ -167,9 +168,23 @@ class CORE_EXPORT QgsProcessingContext
 
     /**
      * Sets the behavior used for checking invalid geometries in input layers.
+     * Settings this to anything but QgsFeatureRequest::GeometryNoCheck will also
+     * reset the invalidGeometryCallback() to a default implementation.
      * \see invalidGeometryCheck()
      */
-    void setInvalidGeometryCheck( const QgsFeatureRequest::InvalidGeometryCheck &check ) { mInvalidGeometryCheck = check; }
+    void setInvalidGeometryCheck( const QgsFeatureRequest::InvalidGeometryCheck &check )
+    {
+      mInvalidGeometryCheck = check;
+
+      if ( mInvalidGeometryCheck == QgsFeatureRequest::GeometryAbortOnInvalid )
+      {
+        auto callback = []( const QgsFeature & feature )
+        {
+          throw QgsProcessingException( QObject::tr( "Feature (%1) has invalid geometry. Please fix the geometry or change the Processing setting to the \"Ignore invalid input features\" option." ).arg( feature.id() ) );
+        };
+        mInvalidGeometryCallback = callback;
+      }
+    }
 
 
     /**

src/core/processing/qgsprocessingutils.cpp

@@ -475,12 +475,3 @@ long QgsProcessingFeatureSource::featureCount() const
 {
   return mSource->featureCount();
 }
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