Add crs, fields, wkbType and featureCount to QgsFeatureSource

python/core/qgsfeaturesource.sip

@@ -9,6 +9,7 @@
 
 
 
+
 class QgsFeatureSource
 {
 %Docstring
@@ -32,8 +33,45 @@ class QgsFeatureSource
  :rtype: QgsFeatureIterator
 %End
 
+    virtual QgsCoordinateReferenceSystem sourceCrs() const = 0;
+%Docstring
+ Returns the coordinate reference system for features in the source.
+ :rtype: QgsCoordinateReferenceSystem
+%End
+
+    virtual QgsFields fields() const = 0;
+%Docstring
+ Returns the fields associated with features in the source.
+ :rtype: QgsFields
+%End
+
+    virtual QgsWkbTypes::Type wkbType() const = 0;
+%Docstring
+ Returns the geometry type for features returned by this source.
+ :rtype: QgsWkbTypes.Type
+%End
+
+
+    int __len__() const;
+%Docstring
+ Returns the number of features contained in the source, or -1
+ if the feature count is unknown.
+ :rtype: int
+%End
+%MethodCode
+    sipRes = sipCpp->featureCount();
+%End
+
+    virtual long featureCount() const = 0;
+%Docstring
+ Returns the number of features contained in the source, or -1
+ if the feature count is unknown.
+ :rtype: long
+%End
+
 };
 
+
 /************************************************************************
  * This file has been generated automatically from                      *
  *                                                                      *

python/core/qgsvectordataprovider.sip

@@ -124,6 +124,9 @@ Bitmask of all provider's editing capabilities
  :rtype: QgsFields
 %End
 
+    virtual QgsCoordinateReferenceSystem sourceCrs() const;
+
+
     virtual QString dataComment() const;
 %Docstring
  Return a short comment for the data that this provider is

python/core/qgsvectorlayer.sip

@@ -685,7 +685,8 @@ Returns true if this is a geometry layer and false in case of NoGeometry (table
  :rtype: bool
 %End
 
-    QgsWkbTypes::Type wkbType() const;
+    virtual QgsWkbTypes::Type wkbType() const;
+
 %Docstring
 Returns the WKBType or WKBUnknown in case of error
  :rtype: QgsWkbTypes.Type
@@ -697,6 +698,9 @@ Return the provider type for this layer
  :rtype: str
 %End
 
+    virtual QgsCoordinateReferenceSystem sourceCrs() const;
+
+
     virtual bool readXml( const QDomNode &layer_node, const QgsReadWriteContext &context );
 %Docstring
  Reads vector layer specific state from project file Dom node.
@@ -1104,7 +1108,7 @@ Return the extent of the layer
  :rtype: QgsRectangle
 %End
 
-    QgsFields fields() const;
+    virtual QgsFields fields() const;
 %Docstring
  Returns the list of fields of this layer.
  This also includes fields which have not yet been saved to the provider.
@@ -1157,7 +1161,8 @@ Returns list of attributes making up the primary key
  :rtype: long
 %End
 
-    long featureCount() const;
+    virtual long featureCount() const;
+
 %Docstring
  Returns feature count including changes which have not yet been committed
  If you need only the count of committed features call this method on this layer's provider.

src/core/qgsfeaturesource.h

@@ -20,8 +20,11 @@
 
 #include "qgis_core.h"
 #include "qgis.h"
-#include "qgsfeature.h"
-#include "qgsfeatureiterator.h"
+
+class QgsFeatureIterator;
+class QgsFeatureRequest;
+class QgsCoordinateReferenceSystem;
+class QgsFields;
 
 /**
  * \class QgsFeatureSource
@@ -43,6 +46,39 @@ class CORE_EXPORT QgsFeatureSource
      */
     virtual QgsFeatureIterator getFeatures( const QgsFeatureRequest &request = QgsFeatureRequest() ) const = 0;
 
+    /**
+     * Returns the coordinate reference system for features in the source.
+     */
+    virtual QgsCoordinateReferenceSystem sourceCrs() const = 0;
+
+    /**
+     * Returns the fields associated with features in the source.
+     */
+    virtual QgsFields fields() const = 0;
+
+    /**
+     * Returns the geometry type for features returned by this source.
+     */
+    virtual QgsWkbTypes::Type wkbType() const = 0;
+
+#ifdef SIP_RUN
+
+    /**
+     * Returns the number of features contained in the source, or -1
+     * if the feature count is unknown.
+     */
+    int __len__() const;
+    % MethodCode
+    sipRes = sipCpp->featureCount();
+    % End
+#endif
+
+    /**
+     * Returns the number of features contained in the source, or -1
+     * if the feature count is unknown.
+     */
+    virtual long featureCount() const = 0;
+
 };
 
 #endif // QGSFEATURESOURCE_H

src/core/qgsvectordataprovider.cpp

@@ -47,6 +47,11 @@ QString QgsVectorDataProvider::storageType() const
   return QStringLiteral( "Generic vector file" );
 }
 
+QgsCoordinateReferenceSystem QgsVectorDataProvider::sourceCrs() const
+{
+  return crs();
+}
+
 QString QgsVectorDataProvider::dataComment() const
 {
   return QString();

src/core/qgsvectordataprovider.h

@@ -158,6 +158,8 @@ class CORE_EXPORT QgsVectorDataProvider : public QgsDataProvider, public QgsFeat
      */
     virtual QgsFields fields() const = 0;
 
+    QgsCoordinateReferenceSystem sourceCrs() const override;
+
     /**
      * Return a short comment for the data that this provider is
      * providing access to (e.g. the comment for postgres table).

src/core/qgsvectorlayer.cpp

@@ -309,6 +309,11 @@ QString QgsVectorLayer::providerType() const
   return mProviderKey;
 }
 
+QgsCoordinateReferenceSystem QgsVectorLayer::sourceCrs() const
+{
+  return crs();
+}
+
 void QgsVectorLayer::reload()
 {
   if ( mDataProvider )

src/core/qgsvectorlayer.h

@@ -691,11 +691,13 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
     bool hasGeometryType() const;
 
     //! Returns the WKBType or WKBUnknown in case of error
-    QgsWkbTypes::Type wkbType() const;
+    QgsWkbTypes::Type wkbType() const override;
 
     //! Return the provider type for this layer
     QString providerType() const;
 
+    QgsCoordinateReferenceSystem sourceCrs() const override;
+
     /** Reads vector layer specific state from project file Dom node.
      * \note Called by QgsMapLayer::readXml().
      */
@@ -1083,7 +1085,7 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
      *
      * \returns A list of fields
      */
-    inline QgsFields fields() const { return mFields; }
+    inline QgsFields fields() const override { return mFields; }
 
     /**
      * Returns the list of fields of this layer.
@@ -1125,7 +1127,7 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
      * Returns feature count including changes which have not yet been committed
      * If you need only the count of committed features call this method on this layer's provider.
      */
-    long featureCount() const;
+    long featureCount() const override;
 
     /** Make layer read-only (editing disabled) or not
      *  \returns false if the layer is in editing yet