Move factory method to base class

python/analysis/auto_generated/georeferencing/qgsgcptransformer.sip.in

@@ -64,6 +64,13 @@ Returns the transformation method.
 Returns a translated string representing the specified transform ``method``.
 %End
 
+    static QgsGcpTransformerInterface *create( TransformMethod method ) /Factory/;
+%Docstring
+Creates a new QgsGcpTransformerInterface subclass representing the specified transform ``method``.
+
+Caller takes ownership of the returned object.
+%End
+
 
   private:
     QgsGcpTransformerInterface( const QgsGcpTransformerInterface &other );

src/analysis/georeferencing/qgsgcptransformer.cpp

@@ -49,6 +49,29 @@ QString QgsGcpTransformerInterface::methodToString( QgsGcpTransformerInterface::
   }
 }
 
+QgsGcpTransformerInterface *QgsGcpTransformerInterface::create( QgsGcpTransformerInterface::TransformMethod method )
+{
+  switch ( method )
+  {
+    case TransformMethod::Linear:
+      return new QgsLinearGeorefTransform;
+    case TransformMethod::Helmert:
+      return new QgsHelmertGeorefTransform;
+    case TransformMethod::PolynomialOrder1:
+      return new QgsGDALGeorefTransform( false, 1 );
+    case TransformMethod::PolynomialOrder2:
+      return new QgsGDALGeorefTransform( false, 2 );
+    case TransformMethod::PolynomialOrder3:
+      return new QgsGDALGeorefTransform( false, 3 );
+    case TransformMethod::ThinPlateSpline:
+      return new QgsGDALGeorefTransform( true, 0 );
+    case TransformMethod::Projective:
+      return new QgsProjectiveGeorefTransform;
+    default:
+      return nullptr;
+  }
+}
+
 
 //
 // QgsLinearGeorefTransform

src/analysis/georeferencing/qgsgcptransformer.h

@@ -81,6 +81,13 @@ class ANALYSIS_EXPORT QgsGcpTransformerInterface SIP_ABSTRACT
      */
     static QString methodToString( TransformMethod method );
 
+    /**
+     * Creates a new QgsGcpTransformerInterface subclass representing the specified transform \a method.
+     *
+     * Caller takes ownership of the returned object.
+     */
+    static QgsGcpTransformerInterface *create( TransformMethod method ) SIP_FACTORY;
+
 #ifndef SIP_RUN
 
     /**

src/app/georeferencer/qgsgeoreftransform.cpp

@@ -26,29 +26,17 @@
 
 QgsGeorefTransform::QgsGeorefTransform( const QgsGeorefTransform &other )
 {
-  mTransformParametrisation = TransformMethod::InvalidTransform;
-  mGeorefTransformImplementation = nullptr;
   selectTransformParametrisation( other.mTransformParametrisation );
 }
 
 QgsGeorefTransform::QgsGeorefTransform( TransformMethod parametrisation )
 {
-  mTransformParametrisation = TransformMethod::InvalidTransform;
-  mGeorefTransformImplementation = nullptr;
   selectTransformParametrisation( parametrisation );
 }
 
-QgsGeorefTransform::QgsGeorefTransform()
-{
-  mTransformParametrisation = TransformMethod::InvalidTransform;
-  mGeorefTransformImplementation = nullptr;
-  mParametersInitialized = false;
-}
+QgsGeorefTransform::QgsGeorefTransform() = default;
 
-QgsGeorefTransform::~QgsGeorefTransform()
-{
-  delete mGeorefTransformImplementation;
-}
+QgsGeorefTransform::~QgsGeorefTransform() = default;
 
 QgsGeorefTransform::TransformMethod QgsGeorefTransform::transformParametrisation() const
 {
@@ -59,8 +47,7 @@ void QgsGeorefTransform::selectTransformParametrisation( TransformMethod paramet
 {
   if ( parametrisation != mTransformParametrisation )
   {
-    delete mGeorefTransformImplementation;
-    mGeorefTransformImplementation = QgsGeorefTransform::createImplementation( parametrisation );
+    mGeorefTransformImplementation.reset( QgsGcpTransformerInterface::create( parametrisation ) );
     mParametersInitialized = false;
     mTransformParametrisation = parametrisation;
   }
@@ -130,29 +117,6 @@ void *QgsGeorefTransform::GDALTransformerArgs() const
   return mGeorefTransformImplementation ? mGeorefTransformImplementation->GDALTransformerArgs() : nullptr;
 }
 
-QgsGcpTransformerInterface *QgsGeorefTransform::createImplementation( TransformMethod parametrisation )
-{
-  switch ( parametrisation )
-  {
-    case TransformMethod::Linear:
-      return new QgsLinearGeorefTransform;
-    case TransformMethod::Helmert:
-      return new QgsHelmertGeorefTransform;
-    case TransformMethod::PolynomialOrder1:
-      return new QgsGDALGeorefTransform( false, 1 );
-    case TransformMethod::PolynomialOrder2:
-      return new QgsGDALGeorefTransform( false, 2 );
-    case TransformMethod::PolynomialOrder3:
-      return new QgsGDALGeorefTransform( false, 3 );
-    case TransformMethod::ThinPlateSpline:
-      return new QgsGDALGeorefTransform( true, 0 );
-    case TransformMethod::Projective:
-      return new QgsProjectiveGeorefTransform;
-    default:
-      return nullptr;
-  }
-}
-
 bool QgsGeorefTransform::transformRasterToWorld( const QgsPointXY &raster, QgsPointXY &world )
 {
   // flip y coordinate due to different CS orientation
@@ -183,7 +147,7 @@ bool QgsGeorefTransform::getLinearOriginScale( QgsPointXY &origin, double &scale
   {
     return false;
   }
-  QgsLinearGeorefTransform *transform = dynamic_cast<QgsLinearGeorefTransform *>( mGeorefTransformImplementation );
+  QgsLinearGeorefTransform *transform = dynamic_cast<QgsLinearGeorefTransform *>( mGeorefTransformImplementation.get() );
   return transform && transform->getOriginScale( origin, scaleX, scaleY );
 }
 
@@ -193,13 +157,13 @@ bool QgsGeorefTransform::getOriginScaleRotation( QgsPointXY &origin, double &sca
   if ( mTransformParametrisation == TransformMethod::Linear )
   {
     rotation = 0.0;
-    QgsLinearGeorefTransform *transform = dynamic_cast<QgsLinearGeorefTransform *>( mGeorefTransformImplementation );
+    QgsLinearGeorefTransform *transform = dynamic_cast<QgsLinearGeorefTransform *>( mGeorefTransformImplementation.get() );
     return transform && transform->getOriginScale( origin, scaleX, scaleY );
   }
   else if ( mTransformParametrisation == TransformMethod::Helmert )
   {
     double scale;
-    QgsHelmertGeorefTransform *transform = dynamic_cast<QgsHelmertGeorefTransform *>( mGeorefTransformImplementation );
+    QgsHelmertGeorefTransform *transform = dynamic_cast<QgsHelmertGeorefTransform *>( mGeorefTransformImplementation.get() );
     if ( !transform || ! transform->getOriginScaleRotation( origin, scale, rotation ) )
     {
       return false;

src/app/georeferencer/qgsgeoreftransform.h

@@ -108,16 +108,14 @@ class QgsGeorefTransform : public QgsGcpTransformerInterface
     QgsGeorefTransform( const QgsGeorefTransform &other );
     QgsGeorefTransform &operator= ( const QgsGeorefTransform & ) = delete;
 
-    //! Factory function which creates an implementation for the given parametrisation.
-    static QgsGcpTransformerInterface *createImplementation( TransformMethod parametrisation );
-
     // convenience wrapper around GDALTransformerFunc
     bool gdal_transform( const QgsPointXY &src, QgsPointXY &dst, int dstToSrc ) const;
 
-    QgsGcpTransformerInterface *mGeorefTransformImplementation = nullptr;
-    TransformMethod     mTransformParametrisation;
-    bool                         mParametersInitialized;
-    QgsRasterChangeCoords        mRasterChangeCoords;
+    std::unique_ptr< QgsGcpTransformerInterface > mGeorefTransformImplementation;
+
+    TransformMethod mTransformParametrisation = TransformMethod::InvalidTransform;
+    bool mParametersInitialized = false;
+    QgsRasterChangeCoords mRasterChangeCoords;
 };
 
 #endif //QGSGEOREFTRANSFORM_H