Variant Class Reference

from PyKDE4.nepomuk import *

Namespace: Nepomuk

Detailed Description

\class Variant variant.h Nepomuk/Variant

The %Nepomuk Variant extends over QVariant by introducing direct support for Resource embedding, automatic list conversion and a restricted set of supported types.

Important differences are:

No new types can be added other than the ones that have defined

constructors and get-methods

Variant supports automatic list generation. For example a Variant

containing an int also can produce an int-list via the toIntList method.

toString and toStringList always return a valid list and do automatic

conversion from the actual type used in the Variant. Thus, if one only needs to display the value in a Variant toString and toStringList do the job.

Variant comes with direct support for Resource. There is one special

thing about QUrl Variants though: for both isUrl() and isResource() return true. However, toUrl() will return different values for Resource and for QUrl Variants: in the former case the actual Resource.resourceUri() is returned which can be different in case of file:/ URLs.

Author:: Sebastian Trueg <trueg@kde.org>

Methods
	__init__ (self)
	__init__ (self, Nepomuk.Variant other)
	__init__ (self, QVariant other)
	__init__ (self, long i)
	__init__ (self, float d)
	__init__ (self, QString string)
	__init__ (self, QDate date)
	__init__ (self, QTime time)
	__init__ (self, QDateTime datetime)
	__init__ (self, QUrl url)
	__init__ (self, Nepomuk.Resource r)
	__init__ (self, [int] i)
	__init__ (self, [long] i)
	__init__ (self, [float] d)
	__init__ (self, QStringList stringlist)
	__init__ (self, [QDate] date)
	__init__ (self, [QTime] time)
	__init__ (self, [QDateTime] datetime)
	__init__ (self, [QUrl] url)
	__init__ (self, [Nepomuk.Resource] r)
	__init__ (self, [Nepomuk.Variant] vl)
	append (self, long i)
	append (self, float d)
	append (self, QString string)
	append (self, QDate date)
	append (self, QTime time)
	append (self, QDateTime datetime)
	append (self, QUrl url)
	append (self, Nepomuk.Resource r)
	append (self, Nepomuk.Variant v)
bool	isBool (self)
bool	isBoolList (self)
bool	isDate (self)
bool	isDateList (self)
bool	isDateTime (self)
bool	isDateTimeList (self)
bool	isDouble (self)
bool	isDoubleList (self)
bool	isInt (self)
bool	isInt64 (self)
bool	isInt64List (self)
bool	isIntList (self)
bool	isList (self)
bool	isResource (self)
bool	isResourceList (self)
bool	isString (self)
bool	isStringList (self)
bool	isTime (self)
bool	isTimeList (self)
bool	isUnsignedInt (self)
bool	isUnsignedInt64 (self)
bool	isUnsignedInt64List (self)
bool	isUnsignedIntList (self)
bool	isUrl (self)
bool	isUrlList (self)
bool	isValid (self)
bool	operator != (self, Nepomuk.Variant other)
bool	operator == (self, Nepomuk.Variant other)
int	simpleType (self)
bool	toBool (self)
QDate	toDate (self)
[QDate]	toDateList (self)
QDateTime	toDateTime (self)
[QDateTime]	toDateTimeList (self)
float	toDouble (self)
[float]	toDoubleList (self)
int	toInt (self)
long	toInt64 (self)
[int]	toIntList (self)
Nepomuk.Resource	toResource (self)
[Nepomuk.Resource]	toResourceList (self)
QString	toString (self)
QStringList	toStringList (self)
QTime	toTime (self)
[QTime]	toTimeList (self)
long	toUnsignedInt (self)
long	toUnsignedInt64 (self)
[long]	toUnsignedIntList (self)
QUrl	toUrl (self)
[QUrl]	toUrlList (self)
[Nepomuk.Variant]	toVariantList (self)
int	type (self)
QVariant	variant (self)
Static Methods
Nepomuk.Variant	fromNode (Soprano.Node node)
Nepomuk.Variant	fromString (QString value, int type)

Method Documentation

__init__ ( self )

__init__	(	self,
		Nepomuk.Variant	other
	)

Will create an invalid Variant if other has an unsupported type.

__init__	(	self,
		QVariant	other
	)

Will create an invalid Variant if other has an unsupported type.

__init__	(	self,
		long	i
	)

__init__	(	self,
		float	d
	)

__init__	(	self,
		QString	string
	)

__init__	(	self,
		QDate	date
	)

__init__	(	self,
		QTime	time
	)

__init__	(	self,
		QDateTime	datetime
	)

__init__	(	self,
		QUrl	url
	)

__init__	(	self,
		Nepomuk.Resource	r
	)

__init__	(	self,
		[int]	i
	)

__init__	(	self,
		[long]	i
	)

__init__	(	self,
		[float]	d
	)

__init__	(	self,
		QStringList	stringlist
	)

__init__	(	self,
		[QDate]	date
	)

__init__	(	self,
		[QTime]	time
	)

__init__	(	self,
		[QDateTime]	datetime
	)

__init__	(	self,
		[QUrl]	url
	)

__init__	(	self,
		[Nepomuk.Resource]	r
	)

__init__	(	self,
		[Nepomuk.Variant]	vl
	)

Create a new Variant from a list of Variants.

Since:: 4.3

append	(	self,
		long	i
	)

Appends the value stored in v to the list in this Variant. If this Variant contains a value with the same simple type as v they are merged into a list. Otherwise this Variant will contain one list of simple type v.simpleType()

append	(	self,
		float	d
	)

append	(	self,
		QString	string
	)

append	(	self,
		QDate	date
	)

append	(	self,
		QTime	time
	)

append	(	self,
		QDateTime	datetime
	)

append	(	self,
		QUrl	url
	)

append	(	self,
		Nepomuk.Resource	r
	)

append	(	self,
		Nepomuk.Variant	v
	)

bool isBool ( self )

bool isBoolList ( self )

bool isDate ( self )

bool isDateList ( self )

bool isDateTime ( self )

bool isDateTimeList ( self )

bool isDouble ( self )

bool isDoubleList ( self )

bool isInt ( self )

bool isInt64 ( self )

bool isInt64List ( self )

bool isIntList ( self )

bool isList ( self )

This methods does not handle all list types. It checks the following:

QList<Resource>

QList<int>

QList<double>

QList<bool>

QList<QDate>

QList<QTime>

QList<QDateTime>

QList<QUrl>

QList<String> (QStringList)

bool isResource ( self )

bool isResourceList ( self )

bool isString ( self )

bool isStringList ( self )

bool isTime ( self )

bool isTimeList ( self )

bool isUnsignedInt ( self )

bool isUnsignedInt64 ( self )

bool isUnsignedInt64List ( self )

bool isUnsignedIntList ( self )

bool isUrl ( self )

bool isUrlList ( self )

bool isValid ( self )

bool operator !=	(	self,
		Nepomuk.Variant	other
	)

Inverse of operator==

bool operator ==	(	self,
		Nepomuk.Variant	other
	)

Does compare two Variant objects. single-valued lists are treated as the single value itself. For example a QStringList variant with one element "x" equals a QString variant with value "x".

int simpleType ( self )

Returns:: the type of the simple value, i.e. with the list stripped.

bool toBool ( self )

Convert into a bool value.

Will return the first value of a bool list.

QDate toDate ( self )

Convert into a QDate value.

Will return the first value of a QDate list.

[QDate] toDateList ( self )

QDateTime toDateTime ( self )

Convert into a QDateTime value.

Will return the first value of a QDateTime list.

[QDateTime] toDateTimeList ( self )

float toDouble ( self )

Convert into a double value.

Will return the first value of a double list.

[float] toDoubleList ( self )

int toInt ( self )

Convert into an int value. Returns a valid value for all decimal types.

Will return the first value of an int list.

long toInt64 ( self )

Convert into a qlonglong value. Returns a valid value for all decimal types.

Will return the first value of a qlonglong list.

[int] toIntList ( self )

Nepomuk.Resource toResource ( self )

Convert into a Resource value.

Will return the first value of a Resource list. Will also convert QUrl variants.

[Nepomuk.Resource] toResourceList ( self )

QString toString ( self )

The toString() method is a little more powerful than other toXXX methods since it actually converts all values to string. Thus, toString should work always (even list variants are converted to a comma-separated list)

Resources are converted to a string representation of their URI.

QStringList toStringList ( self )

Just like the toString method toStringList is able to convert all supported types into a list of strings.

QTime toTime ( self )

Convert into a QTime value.

Will return the first value of a QTime list.

[QTime] toTimeList ( self )

long toUnsignedInt ( self )

Convert into a uint value. Returns a valid value for all decimal types.

Will return the first value of a uint list.

long toUnsignedInt64 ( self )

Convert into a qulonglong value. Returns a valid value for all decimal types.

Will return the first value of a qulonglong list.

[long] toUnsignedIntList ( self )

QUrl toUrl ( self )

Convert into a QUrl value. Can handle both QUrl and Resource variants. The latter will be converted into its resource URI

Will return the first value of a QUrl list.

\sa Resource.resourceUri

[QUrl] toUrlList ( self )

[Nepomuk.Variant] toVariantList ( self )

Convert a Variant to a list of Variants.

Since:: 4.3

int type ( self )

Returns:: the QT Meta type id of the type

QVariant variant ( self )

Static Method Documentation

Nepomuk.Variant fromNode	(	Soprano.Node	node
	)

Create a Variant object from a Soprano.Node.

Since:: 4.5

Nepomuk.Variant fromString	(	QString	value,
		int	type
	)

Create a Variant object by parsing string value based on type. If type is unknown a simple string Variant object is returned containing the plain string value.

Variant Class Reference

Detailed Description

Methods

Static Methods

Method Documentation

Static Method Documentation

Modules