QgsExpression::Function Class Reference

A abstract base class for defining QgsExpression functions. More...

#include <qgsexpression.h>

Inheritance diagram for QgsExpression::Function:

Public Member Functions
	Function (QString fnname, int params, QString group, QString helpText=QString(), bool usesGeometry=false)
QString	name ()
	The name of the function.
int	params ()
	The number of parameters this function takes.
bool	usesgeometry ()
	Does this function use a geometry object.
QString	group ()
	The group the function belongs to.
QString	helptext ()
	The help text for the function.
virtual QVariant	func (const QVariantList &values, const QgsFeature *f, QgsExpression *parent)=0
bool	operator== (const Function &other) const

Private Attributes
QString	mName
int	mParams
bool	mUsesGeometry
QString	mGroup
QString	mHelpText

Detailed Description

A abstract base class for defining QgsExpression functions.

Definition at line 241 of file qgsexpression.h.

Constructor & Destructor Documentation

QgsExpression::Function::Function ( QString  fnname, int  params, QString  group, QString  helpText = QString(), bool  usesGeometry = false  )

inline

Definition at line 244 of file qgsexpression.h.

Member Function Documentation

virtual QVariant QgsExpression::Function::func ( const QVariantList &  values, const QgsFeature *  f, QgsExpression *  parent  )

pure virtual

Implemented in QgsExpression::StaticFunction.

Referenced by QgsExpression::NodeFunction::eval().

QString QgsExpression::Function::group ( )

inline

The group the function belongs to.

Definition at line 253 of file qgsexpression.h.

Referenced by QgsExpressionBuilderWidget::QgsExpressionBuilderWidget().

QString QgsExpression::Function::helptext ( )

inline

The help text for the function.

Definition at line 255 of file qgsexpression.h.

References QgsExpression::helptext().

Referenced by QgsExpressionBuilderWidget::QgsExpressionBuilderWidget().

QString QgsExpression::Function::name ( )

inline

The name of the function.

Definition at line 247 of file qgsexpression.h.

Referenced by QgsExpression::NodeFunction::dump(), QgsExpression::NodeFunction::eval(), QgsOgcUtils::expressionFunctionToOgcFilter(), geometryFromConstExpr(), isGeometryColumn(), QgsOgcUtils::nodeFunctionFromOgcFilter(), and QgsExpressionBuilderWidget::QgsExpressionBuilderWidget().

bool QgsExpression::Function::operator== ( const Function &  other ) const

inline

Definition at line 259 of file qgsexpression.h.

References mName.

int QgsExpression::Function::params ( )

inline

The number of parameters this function takes.

Definition at line 249 of file qgsexpression.h.

Referenced by QgsExpression::NodeFunction::dump(), QgsOgcUtils::expressionFunctionToOgcFilter(), and QgsExpressionBuilderWidget::QgsExpressionBuilderWidget().

bool QgsExpression::Function::usesgeometry ( )

inline

Does this function use a geometry object.

Definition at line 251 of file qgsexpression.h.

Member Data Documentation

QString QgsExpression::Function::mGroup

private

Definition at line 271 of file qgsexpression.h.

QString QgsExpression::Function::mHelpText

private

Definition at line 272 of file qgsexpression.h.

QString QgsExpression::Function::mName

private

Definition at line 268 of file qgsexpression.h.

Referenced by operator==().

int QgsExpression::Function::mParams

private

Definition at line 269 of file qgsexpression.h.

bool QgsExpression::Function::mUsesGeometry

private

Definition at line 270 of file qgsexpression.h.

---

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

• /tmp/buildd/qgis-2.2.0+wheezy1/src/core/qgsexpression.h