Container of fields for a vector layer. More...

#include <qgsfield.h>

Classes
struct	Field

Public Types
typedef struct QgsFields::Field	Field
enum	FieldOrigin { OriginUnknown, OriginProvider, OriginJoin, OriginEdit, OriginExpression }

Public Member Functions
QgsAttributeList	allAttributesList () const
	Utility function to get list of attribute indexes.
bool	append (const QgsField &field, FieldOrigin origin=OriginProvider, int originIndex=-1)
	Append a field. The field must have unique name, otherwise it is rejected (returns false)
bool	appendExpressionField (const QgsField &field, int originIndex)
	Append an expression field. The field must have unique name, otherwise it is rejected (returns false)
const QgsField &	at (int i) const
	Get field at particular index (must be in range 0..N-1)
void	clear ()
	Remove all fields.
int	count () const
	Return number of items.
bool	exists (int i) const
	Return if a field index is valid.
void	extend (const QgsFields &other)
	Extend with fields from another QgsFields container.
const QgsField &	field (int fieldIdx) const
	Get field at particular index (must be in range 0..N-1)
const QgsField &	field (const QString &name) const
	Get field at particular index (must be in range 0..N-1)
int	fieldNameIndex (const QString &fieldName) const
	Look up field's index from name - case insensitive TODO: sort out case sensitive (indexFromName()) vs insensitive (fieldNameIndex()) calls.
FieldOrigin	fieldOrigin (int fieldIdx) const
	Get field's origin (value from an enumeration)
int	fieldOriginIndex (int fieldIdx) const
	Get field's origin index (its meaning is specific to each type of origin)
int	indexFromName (const QString &name) const
	Look up field's index from name. Returns -1 on error.
bool	isEmpty () const
	Check whether the container is empty.
bool	operator!= (const QgsFields &other) const
bool	operator== (const QgsFields &other) const
const QgsField &	operator[] (int i) const
	Get field at particular index (must be in range 0..N-1)
QgsField &	operator[] (int i)
	Get field at particular index (must be in range 0..N-1)
void	remove (int fieldIdx)
	Remove a field with the given index.
int	size () const
	Return number of items.
QList< QgsField >	toList () const
	Utility function to return a list of QgsField instances.

Protected Attributes
QVector< Field >	mFields
	internal storage of the container
QHash< QString, int >	mNameToIndex
	map for quick resolution of name to index

Detailed Description

Container of fields for a vector layer.

In addition to storing a list of QgsField instances, it also:

allows quick lookups of field names to index in the list
keeps track of where the field definition comes from (vector data provider, joined layer or newly added from an editing operation)

Definition at line 172 of file qgsfield.h.

Member Typedef Documentation

typedef struct QgsFields::Field QgsFields::Field

Member Enumeration Documentation

enum QgsFields::FieldOrigin

Enumerator:

OriginUnknown	it has not been specified where the field comes from
OriginProvider	field comes from the underlying data provider of the vector layer (originIndex = index in provider's fields)
OriginJoin	field comes from a joined layer (originIndex / 1000 = index of the join, originIndex % 1000 = index within the join)
OriginEdit	field has been temporarily added in editing mode (originIndex = index in the list of added attributes)
OriginExpression	field is calculated from an expression

Definition at line 176 of file qgsfield.h.

Member Function Documentation

QgsAttributeList QgsFields::allAttributesList ( ) const

Utility function to get list of attribute indexes.

Note: added in 2.4

Definition at line 246 of file qgsfield.cpp.

bool QgsFields::append	(	const QgsField &	field,
		FieldOrigin	origin = `OriginProvider`,
		int	originIndex = `-1`
	)

Append a field. The field must have unique name, otherwise it is rejected (returns false)

Definition at line 177 of file qgsfield.cpp.

bool QgsFields::appendExpressionField	(	const QgsField &	field,
		int	originIndex
	)

Append an expression field. The field must have unique name, otherwise it is rejected (returns false)

Definition at line 190 of file qgsfield.cpp.

const QgsField& QgsFields::at ( int i ) const

inline

Get field at particular index (must be in range 0..N-1)

Definition at line 227 of file qgsfield.h.

void QgsFields::clear ( )

Remove all fields.

Definition at line 171 of file qgsfield.cpp.

int QgsFields::count ( ) const

inline

Return number of items.

Definition at line 214 of file qgsfield.h.

bool QgsFields::exists ( int i ) const

inline

Return if a field index is valid.

Parameters

i	Index of the field which needs to be checked

Returns: True if the field exists

Definition at line 220 of file qgsfield.h.

void QgsFields::extend ( const QgsFields & other )

Extend with fields from another QgsFields container.

Definition at line 210 of file qgsfield.cpp.

const QgsField& QgsFields::field ( int fieldIdx ) const

inline

Get field at particular index (must be in range 0..N-1)

Definition at line 229 of file qgsfield.h.

const QgsField& QgsFields::field ( const QString & name ) const

inline

Get field at particular index (must be in range 0..N-1)

Definition at line 231 of file qgsfield.h.

int QgsFields::fieldNameIndex ( const QString & fieldName ) const

Look up field's index from name - case insensitive TODO: sort out case sensitive (indexFromName()) vs insensitive (fieldNameIndex()) calls.

Note: added in 2.4

Definition at line 234 of file qgsfield.cpp.

QgsFields::FieldOrigin QgsFields::fieldOrigin ( int fieldIdx ) const

Get field's origin (value from an enumeration)

Definition at line 218 of file qgsfield.cpp.

int QgsFields::fieldOriginIndex ( int fieldIdx ) const

inline

Get field's origin index (its meaning is specific to each type of origin)

Definition at line 236 of file qgsfield.h.

int QgsFields::indexFromName ( const QString & name ) const

inline

Look up field's index from name. Returns -1 on error.

Definition at line 239 of file qgsfield.h.

bool QgsFields::isEmpty ( ) const

inline

Check whether the container is empty.

Definition at line 212 of file qgsfield.h.

bool QgsFields::operator!= ( const QgsFields & other ) const

inline

Note: added in 2.6

Definition at line 256 of file qgsfield.h.

bool QgsFields::operator== ( const QgsFields & other ) const

inline

Note: added in 2.6

Definition at line 254 of file qgsfield.h.

const QgsField& QgsFields::operator[] ( int i ) const

inline

Get field at particular index (must be in range 0..N-1)

Definition at line 223 of file qgsfield.h.

QgsField& QgsFields::operator[] ( int i )

inline

Get field at particular index (must be in range 0..N-1)

Definition at line 225 of file qgsfield.h.

void QgsFields::remove ( int fieldIdx )

Remove a field with the given index.

Definition at line 201 of file qgsfield.cpp.

int QgsFields::size ( ) const

inline

Return number of items.

Definition at line 216 of file qgsfield.h.

QList< QgsField > QgsFields::toList ( ) const

Utility function to return a list of QgsField instances.

Definition at line 226 of file qgsfield.cpp.

Member Data Documentation

QVector<Field> QgsFields::mFields

protected

internal storage of the container

Definition at line 260 of file qgsfield.h.

QHash<QString, int> QgsFields::mNameToIndex

protected

map for quick resolution of name to index

Definition at line 263 of file qgsfield.h.

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

/tmp/buildd/qgis-2.8.2+12wheezy/src/core/qgsfield.h
/tmp/buildd/qgis-2.8.2+12wheezy/src/core/qgsfield.cpp

Classes

Public Types

Public Member Functions

Protected Attributes

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Member Function Documentation

Member Data Documentation