Add documentation

python/core/auto_generated/qgsogcutils.sip.in

@@ -150,6 +150,15 @@ according to the OGC filter specs (=,!=,<,>,<=,>=,AND,OR,NOT)
     };
 
     static QgsExpression *expressionFromOgcFilter( const QDomElement &element, FilterVersion version, QgsVectorLayer *layer = 0 ) /Factory/;
+%Docstring
+Returns an expression from a WFS filter embedded in a document.
+
+:param element: The WFS Filter
+:param version: The WFS version
+:param layer: Layer to use to retrieve field values from literal filters
+
+.. versionadded:: 3.4
+%End
 
 
     static QDomElement expressionToOgcExpression( const QgsExpression &exp, QDomDocument &doc, QString *errorMessage = 0 );

src/core/qgsogcutils.h

@@ -161,6 +161,13 @@ class CORE_EXPORT QgsOgcUtils
       FILTER_FES_2_0
     };
 
+    /**
+     * Returns an expression from a WFS filter embedded in a document.
+     * \param element The WFS Filter
+     * \param version The WFS version
+     * \param layer Layer to use to retrieve field values from literal filters
+     * \since QGIS 3.4
+     */
     static QgsExpression *expressionFromOgcFilter( const QDomElement &element, FilterVersion version, QgsVectorLayer *layer = nullptr ) SIP_FACTORY;
 
     /**
@@ -369,23 +376,84 @@ class QgsOgcUtilsExprToFilter
     QDomElement expressionFunctionToOgcFilter( const QgsExpressionNodeFunction *node, QgsExpression *expression, const QgsExpressionContext *context );
 };
 
+/**
+ * \ingroup core
+ * \brief Internal use by QgsOgcUtils
+ * \note not available in Python bindings
+ * \since QGIS 3.4
+ */
 class QgsOgcUtilsExprFromFilter
 {
   public:
+
+    /**
+     * Constructor for QgsOgcUtilsExprFromFilter.
+     * \param version WFS Version
+     * \param layer Layer to use to retrieve field values from literal filters
+     */
     QgsOgcUtilsExprFromFilter( QgsOgcUtils::FilterVersion version = QgsOgcUtils::FILTER_OGC_1_0,
                                QgsVectorLayer *layer = nullptr );
 
+    /**
+     * Returns an expression node from a WFS filter embedded in a document
+     * element. A null pointer is returned when an error happened.
+     * \param element The WFS filter
+     */
     QgsExpressionNode *nodeFromOgcFilter( const QDomElement &element );
 
+    /**
+     * Returns the underlying error message, or an empty string in case of no
+     * error.
+     */
     QString errorMessage() const;
 
+    /**
+     * Returns an expression node from a WFS filter embedded in a document with
+     * binary operators.
+     *
+     */
     QgsExpressionNodeBinaryOperator *nodeBinaryOperatorFromOgcFilter( const QDomElement &element );
+
+    /**
+     * Returns an expression node from a WFS filter embedded in a document with
+     * spatial operators.
+     */
     QgsExpressionNodeFunction *nodeSpatialOperatorFromOgcFilter( const QDomElement &element );
+
+    /**
+     * Returns an expression node from a WFS filter embedded in a document with
+     * column references.
+     */
     QgsExpressionNodeColumnRef *nodeColumnRefFromOgcFilter( const QDomElement &element );
+
+    /**
+     * Returns an expression node from a WFS filter embedded in a document with
+     * literal tag.
+     */
     QgsExpressionNode *nodeLiteralFromOgcFilter( const QDomElement &element );
+
+    /**
+     * Returns an expression node from a WFS filter embedded in a document with
+     * Not operator.
+     */
     QgsExpressionNodeUnaryOperator *nodeNotFromOgcFilter( const QDomElement &element );
+
+    /**
+     * Returns an expression node from a WFS filter embedded in a document with
+     * IsNull operator.
+     */
     QgsExpressionNodeBinaryOperator *nodePropertyIsNullFromOgcFilter( const QDomElement &element );
+
+    /**
+     * Returns an expression node from a WFS filter embedded in a document with
+     * functions.
+     */
     QgsExpressionNodeFunction *nodeFunctionFromOgcFilter( const QDomElement &element );
+
+    /**
+     * Returns an expression node from a WFS filter embedded in a document with
+     * boudnaries operator.
+     */
     QgsExpressionNode *nodeIsBetweenFromOgcFilter( const QDomElement &element );
 
   private: