The QgsOgcUtils class provides various utility functions for conversion between OGC (Open Geospatial Consortium) standards and QGIS internal representations. More...

#include <qgsogcutils.h>

Classes
struct	Context
	The Context struct stores the current layer and coordinate transform context. More...

class	LayerProperties
	Layer properties. More...

Public Types
enum	FilterVersion { FILTER_OGC_1_0 , FILTER_OGC_1_1 , FILTER_FES_2_0 }
	OGC filter version. More...

enum	GMLVersion { GML_2_1_2 , GML_3_1_0 , GML_3_2_1 }
	GML version. More...

Static Public Member Functions
static QColor	colorFromOgcFill (const QDomElement &fillElement)
	Parse XML with OGC fill into QColor.

static QDomElement	elseFilterExpression (QDomDocument &doc)
	Creates an ElseFilter from doc.

static QgsExpression *	expressionFromOgcFilter (const QDomElement &element, FilterVersion version, QgsVectorLayer *layer=nullptr)
	Returns an expression from a WFS filter embedded in a document.

static QgsExpression *	expressionFromOgcFilter (const QDomElement &element, QgsVectorLayer *layer=nullptr)
	Parse XML with OGC filter into QGIS expression.

static QDomElement	expressionToOgcExpression (const QgsExpression &exp, QDomDocument &doc, QgsOgcUtils::GMLVersion gmlVersion, FilterVersion filterVersion, const QString &geometryName, const QString &srsName, bool honourAxisOrientation, bool invertAxisOrientation, QString *errorMessage=nullptr, bool requiresFilterElement=false, const QMap< QString, QString > &fieldNameToXPathMap=QMap< QString, QString >(), const QMap< QString, QString > &namespacePrefixToUriMap=QMap< QString, QString >())
	Creates an OGC expression XML element from the exp expression.

static QDomElement	expressionToOgcExpression (const QgsExpression &exp, QDomDocument &doc, QString *errorMessage=nullptr, bool requiresFilterElement=false)
	Creates an OGC expression XML element from the exp expression with default values for the geometry name, srs name, honourAsisOrientation and invertAxisOrientation.

static QDomElement	expressionToOgcFilter (const QgsExpression &exp, QDomDocument &doc, QgsOgcUtils::GMLVersion gmlVersion, FilterVersion filterVersion, const QString &namespacePrefix, const QString &namespaceURI, const QString &geometryName, const QString &srsName, bool honourAxisOrientation, bool invertAxisOrientation, QString *errorMessage=nullptr, const QMap< QString, QString > &fieldNameToXPathMap=QMap< QString, QString >(), const QMap< QString, QString > &namespacePrefixToUriMap=QMap< QString, QString >())
	Creates OGC filter XML element.

static QDomElement	expressionToOgcFilter (const QgsExpression &exp, QDomDocument &doc, QString *errorMessage=nullptr)
	Creates OGC filter XML element.

static QgsGeometry	geometryFromGML (const QDomNode &geometryNode, const QgsOgcUtils::Context &context=QgsOgcUtils::Context())
	Static method that creates geometry from GML.

static QgsGeometry	geometryFromGML (const QString &xmlString, const QgsOgcUtils::Context &context=QgsOgcUtils::Context())
	Static method that creates geometry from GML.

static QDomElement	geometryToGML (const QgsGeometry &geometry, QDomDocument &doc, const QString &format, int precision=17)
	Exports the geometry to GML2 or GML3.

static QDomElement	geometryToGML (const QgsGeometry &geometry, QDomDocument &doc, int precision=17)
	Exports the geometry to GML2.

static QDomElement	geometryToGML (const QgsGeometry &geometry, QDomDocument &doc, QgsOgcUtils::GMLVersion gmlVersion, const QString &srsName, bool invertAxisOrientation, const QString &gmlIdBase, int precision=17)
	Exports the geometry to GML.

static QgsRectangle	rectangleFromGMLBox (const QDomNode &boxNode)
	Read rectangle from GML2 Box.

static QgsRectangle	rectangleFromGMLEnvelope (const QDomNode &envelopeNode)
	Read rectangle from GML3 Envelope.

static QDomElement	rectangleToGMLBox (QgsRectangle *box, QDomDocument &doc, const QString &srsName, bool invertAxisOrientation, int precision=17)
	Exports the rectangle to GML2 Box.

static QDomElement	rectangleToGMLBox (QgsRectangle *box, QDomDocument &doc, int precision=17)
	Exports the rectangle to GML2 Box.

static QDomElement	rectangleToGMLEnvelope (QgsRectangle *env, QDomDocument &doc, const QString &srsName, bool invertAxisOrientation, int precision=17)
	Exports the rectangle to GML3 Envelope.

static QDomElement	rectangleToGMLEnvelope (QgsRectangle *env, QDomDocument &doc, int precision=17)
	Exports the rectangle to GML3 Envelope.

static QDomElement	SQLStatementToOgcFilter (const QgsSQLStatement &statement, QDomDocument &doc, QgsOgcUtils::GMLVersion gmlVersion, FilterVersion filterVersion, const QList< LayerProperties > &layerProperties, bool honourAxisOrientation, bool invertAxisOrientation, const QMap< QString, QString > &mapUnprefixedTypenameToPrefixedTypename, QString *errorMessage=nullptr, const QMap< QString, QString > &fieldNameToXPathMap=QMap< QString, QString >(), const QMap< QString, QString > &namespacePrefixToUriMap=QMap< QString, QString >())
	Creates OGC filter XML element from the WHERE and JOIN clauses of a SQL statement.

Detailed Description

The QgsOgcUtils class provides various utility functions for conversion between OGC (Open Geospatial Consortium) standards and QGIS internal representations.

Currently supported standards:

GML2 - Geography Markup Language (import, export)

Definition at line 53 of file qgsogcutils.h.

Member Enumeration Documentation

◆ FilterVersion

enum QgsOgcUtils::FilterVersion

OGC filter version.

Enumerator
FILTER_OGC_1_0
FILTER_OGC_1_1
FILTER_FES_2_0

Definition at line 177 of file qgsogcutils.h.

◆ GMLVersion

enum QgsOgcUtils::GMLVersion

GML version.

Enumerator
GML_2_1_2
GML_3_1_0
GML_3_2_1

Definition at line 79 of file qgsogcutils.h.

Member Function Documentation

◆ colorFromOgcFill()

QColor QgsOgcUtils::colorFromOgcFill ( const QDomElement & fillElement )

static

Parse XML with OGC fill into QColor.

Definition at line 1648 of file qgsogcutils.cpp.

◆ elseFilterExpression()

QDomElement QgsOgcUtils::elseFilterExpression ( QDomDocument & doc )

static

Creates an ElseFilter from doc.

Returns: valid OGC ElseFilter QDomElement

Since: QGIS 3.28

Definition at line 1884 of file qgsogcutils.cpp.

◆ expressionFromOgcFilter() [1/2]

QgsExpression * QgsOgcUtils::expressionFromOgcFilter	(	const QDomElement &	element,
		FilterVersion	version,
		QgsVectorLayer *	layer = `nullptr`
	)

static

Returns an expression from a WFS filter embedded in a document.

Parameters

element	The WFS Filter
version	The WFS version
layer	Layer to use to retrieve field values from literal filters

Since: QGIS 3.4

Definition at line 1692 of file qgsogcutils.cpp.

◆ expressionFromOgcFilter() [2/2]

QgsExpression * QgsOgcUtils::expressionFromOgcFilter	(	const QDomElement &	element,
		QgsVectorLayer *	layer = `nullptr`
	)

static

Parse XML with OGC filter into QGIS expression.

Definition at line 1687 of file qgsogcutils.cpp.

◆ expressionToOgcExpression() [1/2]

QDomElement QgsOgcUtils::expressionToOgcExpression	(	const QgsExpression &	exp,
		QDomDocument &	doc,
		QgsOgcUtils::GMLVersion	gmlVersion,
		FilterVersion	filterVersion,
		const QString &	geometryName,
		const QString &	srsName,
		bool	honourAxisOrientation,
		bool	invertAxisOrientation,
		QString *	errorMessage = `nullptr`,
		bool	requiresFilterElement = `false`,
		const QMap< QString, QString > &	fieldNameToXPathMap = `QMap<QString, QString>()`,
		const QMap< QString, QString > &	namespacePrefixToUriMap = `QMap<QString, QString>()`
	)

static

Creates an OGC expression XML element from the exp expression.

Returns

valid OGC expression QDomElement on success or a valid

<Filter>

QDomElement when requiresFilterElement is set. otherwise null QDomElement

Definition at line 1931 of file qgsogcutils.cpp.

◆ expressionToOgcExpression() [2/2]

QDomElement QgsOgcUtils::expressionToOgcExpression	(	const QgsExpression &	exp,
		QDomDocument &	doc,
		QString *	errorMessage = `nullptr`,
		bool	requiresFilterElement = `false`
	)

static

Creates an OGC expression XML element from the exp expression with default values for the geometry name, srs name, honourAsisOrientation and invertAxisOrientation.

Returns

valid OGC expression QDomElement on success or a valid

<Filter>

QDomElement when requiresFilterElement is set. otherwise null QDomElement

Definition at line 1878 of file qgsogcutils.cpp.

◆ expressionToOgcFilter() [1/2]

QDomElement QgsOgcUtils::expressionToOgcFilter	(	const QgsExpression &	exp,
		QDomDocument &	doc,
		QgsOgcUtils::GMLVersion	gmlVersion,
		FilterVersion	filterVersion,
		const QString &	namespacePrefix,
		const QString &	namespaceURI,
		const QString &	geometryName,
		const QString &	srsName,
		bool	honourAxisOrientation,
		bool	invertAxisOrientation,
		QString *	errorMessage = `nullptr`,
		const QMap< QString, QString > &	fieldNameToXPathMap = `QMap<QString, QString>()`,
		const QMap< QString, QString > &	namespacePrefixToUriMap = `QMap<QString, QString>()`
	)

static

Creates OGC filter XML element.

Supports minimum standard filter according to the OGC filter specs (=,!=,<,>,<=,>=,AND,OR,NOT)

Returns

valid

<Filter>

QDomElement on success, otherwise null QDomElement

Note: not available in Python bindings

Definition at line 1890 of file qgsogcutils.cpp.

◆ expressionToOgcFilter() [2/2]

QDomElement QgsOgcUtils::expressionToOgcFilter	(	const QgsExpression &	exp,
		QDomDocument &	doc,
		QString *	errorMessage = `nullptr`
	)

static

Creates OGC filter XML element.

Supports minimum standard filter according to the OGC filter specs (=,!=,<,>,<=,>=,AND,OR,NOT)

Returns

valid

<Filter>

QDomElement on success, otherwise null QDomElement

Definition at line 1872 of file qgsogcutils.cpp.

◆ geometryFromGML() [1/2]

QgsGeometry QgsOgcUtils::geometryFromGML	(	const QDomNode &	geometryNode,
		const QgsOgcUtils::Context &	context = `QgsOgcUtils::Context()`
	)

static

Static method that creates geometry from GML.

Definition at line 87 of file qgsogcutils.cpp.

◆ geometryFromGML() [2/2]

QgsGeometry QgsOgcUtils::geometryFromGML	(	const QString &	xmlString,
		const QgsOgcUtils::Context &	context = `QgsOgcUtils::Context()`
	)

static

Static method that creates geometry from GML.

Parameters

xmlString

xml representation of the geometry. GML elements are expected to be in default namespace (

{<Point>...</Point>

) or in "gml" namespace (

<gml:Point>...</gml:Point>

)

context QgsOgcUtils context

Definition at line 197 of file qgsogcutils.cpp.

◆ geometryToGML() [1/3]

QDomElement QgsOgcUtils::geometryToGML	(	const QgsGeometry &	geometry,
		QDomDocument &	doc,
		const QString &	format,
		int	precision = `17`
	)

static

Exports the geometry to GML2 or GML3.

Returns: QDomElement

Definition at line 1209 of file qgsogcutils.cpp.

◆ geometryToGML() [2/3]

QDomElement QgsOgcUtils::geometryToGML	(	const QgsGeometry &	geometry,
		QDomDocument &	doc,
		int	precision = `17`
	)

static

Exports the geometry to GML2.

Returns: QDomElement

Definition at line 1590 of file qgsogcutils.cpp.

◆ geometryToGML() [3/3]

QDomElement QgsOgcUtils::geometryToGML	(	const QgsGeometry &	geometry,
		QDomDocument &	doc,
		QgsOgcUtils::GMLVersion	gmlVersion,
		const QString &	srsName,
		bool	invertAxisOrientation,
		const QString &	gmlIdBase,
		int	precision = `17`
	)

static

Exports the geometry to GML.

Returns: QDomElement

Definition at line 1214 of file qgsogcutils.cpp.

◆ rectangleFromGMLBox()

QgsRectangle QgsOgcUtils::rectangleFromGMLBox ( const QDomNode & boxNode )

static

Read rectangle from GML2 Box.

Definition at line 968 of file qgsogcutils.cpp.

◆ rectangleFromGMLEnvelope()

QgsRectangle QgsOgcUtils::rectangleFromGMLEnvelope ( const QDomNode & envelopeNode )

static

Read rectangle from GML3 Envelope.

Definition at line 1049 of file qgsogcutils.cpp.

◆ rectangleToGMLBox() [1/2]

QDomElement QgsOgcUtils::rectangleToGMLBox	(	QgsRectangle *	box,
		QDomDocument &	doc,
		const QString &	srsName,
		bool	invertAxisOrientation,
		int	precision = `17`
	)

static

Exports the rectangle to GML2 Box.

Returns: QDomElement

Definition at line 1133 of file qgsogcutils.cpp.

◆ rectangleToGMLBox() [2/2]

QDomElement QgsOgcUtils::rectangleToGMLBox	(	QgsRectangle *	box,
		QDomDocument &	doc,
		int	precision = `17`
	)

static

Exports the rectangle to GML2 Box.

Returns: QDomElement

Definition at line 1128 of file qgsogcutils.cpp.

◆ rectangleToGMLEnvelope() [1/2]

QDomElement QgsOgcUtils::rectangleToGMLEnvelope	(	QgsRectangle *	env,
		QDomDocument &	doc,
		const QString &	srsName,
		bool	invertAxisOrientation,
		int	precision = `17`
	)

static

Exports the rectangle to GML3 Envelope.

Returns: QDomElement

Definition at line 1173 of file qgsogcutils.cpp.

◆ rectangleToGMLEnvelope() [2/2]

QDomElement QgsOgcUtils::rectangleToGMLEnvelope	(	QgsRectangle *	env,
		QDomDocument &	doc,
		int	precision = `17`
	)

static

Exports the rectangle to GML3 Envelope.

Returns: QDomElement

Definition at line 1168 of file qgsogcutils.cpp.

◆ SQLStatementToOgcFilter()

QDomElement QgsOgcUtils::SQLStatementToOgcFilter	(	const QgsSQLStatement &	statement,
		QDomDocument &	doc,
		QgsOgcUtils::GMLVersion	gmlVersion,
		FilterVersion	filterVersion,
		const QList< LayerProperties > &	layerProperties,
		bool	honourAxisOrientation,
		bool	invertAxisOrientation,
		const QMap< QString, QString > &	mapUnprefixedTypenameToPrefixedTypename,
		QString *	errorMessage = `nullptr`,
		const QMap< QString, QString > &	fieldNameToXPathMap = `QMap<QString, QString>()`,
		const QMap< QString, QString > &	namespacePrefixToUriMap = `QMap<QString, QString>()`
	)

static

Creates OGC filter XML element from the WHERE and JOIN clauses of a SQL statement.

Supports minimum standard filter according to the OGC filter specs (=,!=,<,>,<=,>=,AND,OR,NOT,LIKE,BETWEEN,IN) Supports layer joins. Supports ST_GeometryFromText(wkt[, srid/srsname]), ST_MakeEnvelope(xmin,ymin,xmax,ymax[, srid/srsname]) ST_GeomFromGML(serialized_gml_string) BBOX() ST_Intersects(), ST_Contains(), ST_Crosses(), ST_Equals(), ST_Disjoint(), ST_Overlaps(), ST_Touches(), ST_Within() ST_DWithin(), ST_Beyond() custom functions

Returns

valid

<Filter>

QDomElement on success, otherwise null QDomElement

Note: not available in Python bindings

Definition at line 1989 of file qgsogcutils.cpp.

The documentation for this class was generated from the following files:

/build/qgis-3.41.0+git20241225+af5edcb665c+99sid/src/core/qgsogcutils.h
/build/qgis-3.41.0+git20241225+af5edcb665c+99sid/src/core/qgsogcutils.cpp

Classes

Public Types

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ FilterVersion

◆ GMLVersion

Member Function Documentation

◆ colorFromOgcFill()

◆ elseFilterExpression()

◆ expressionFromOgcFilter() [1/2]

◆ expressionFromOgcFilter() [2/2]

◆ expressionToOgcExpression() [1/2]

◆ expressionToOgcExpression() [2/2]

◆ expressionToOgcFilter() [1/2]

◆ expressionToOgcFilter() [2/2]

◆ geometryFromGML() [1/2]

◆ geometryFromGML() [2/2]

◆ geometryToGML() [1/3]

◆ geometryToGML() [2/3]

◆ geometryToGML() [3/3]

◆ rectangleFromGMLBox()

◆ rectangleFromGMLEnvelope()

◆ rectangleToGMLBox() [1/2]

◆ rectangleToGMLBox() [2/2]

◆ rectangleToGMLEnvelope() [1/2]

◆ rectangleToGMLEnvelope() [2/2]

◆ SQLStatementToOgcFilter()