KPluginMetaData

#include <KPluginMetaData>

Inheritance diagram for KPluginMetaData:

Properties
QVariantList	authors

QString	category

QString	copyrightText

QStringList	dependencies

QString	description

QString	extraInformation

QString	fileName

QStringList	formFactors

QString	iconName

int	initialPreference

bool	isEnabledByDefault

bool	isHidden

bool	isValid

QString	license

QString	licenseText

QString	metaDataFileName

QStringList	mimeTypes

QString	name

QVariantList	otherContributors

QString	pluginId

QJsonObject	rawData

QStringList	serviceTypes

QVariantList	translators

QString	version

QString	website

Public Member Functions
	KPluginMetaData ()

	KPluginMetaData (const KPluginLoader &loader)

	KPluginMetaData (const QPluginLoader &loader)

	KPluginMetaData (const QString &file)

	KPluginMetaData (const QJsonObject &metaData, const QString &file)

	KPluginMetaData (const QJsonObject &metaData, const QString &pluginFile, const QString &metaDataFile)

	KPluginMetaData (const KPluginMetaData &)

	~KPluginMetaData ()

QList< KAboutPerson >	authors () const

QString	category () const

QString	copyrightText () const

QStringList	dependencies () const

QString	description () const

QString	extraInformation () const

QString	fileName () const

QStringList	formFactors () const

QString	iconName () const

int	initialPreference () const

QObject *	instantiate () const

bool	isEnabledByDefault () const

bool	isHidden () const

bool	isValid () const

QString	license () const

QString	licenseText () const

QString	metaDataFileName () const

QStringList	mimeTypes () const

QString	name () const

bool	operator!= (const KPluginMetaData &other) const

KPluginMetaData &	operator= (const KPluginMetaData &)

bool	operator== (const KPluginMetaData &other) const

QList< KAboutPerson >	otherContributors () const

QString	pluginId () const

QJsonObject	rawData () const

QStringList	serviceTypes () const

bool	supportsMimeType (const QString &mimeType) const

QList< KAboutPerson >	translators () const

QString	value (const QString &key, const QString &defaultValue=QString()) const

QString	version () const

QString	website () const

Static Public Member Functions
static KPluginMetaData	fromDesktopFile (const QString &file, const QStringList &serviceTypes=QStringList())

static QStringList	readStringList (const QJsonObject &jo, const QString &key)

static QString	readTranslatedString (const QJsonObject &jo, const QString &key, const QString &defaultValue=QString())

static QJsonValue	readTranslatedValue (const QJsonObject &jo, const QString &key, const QJsonValue &defaultValue=QJsonValue())

Detailed Description

This class allows easily accessing some standardized values from the JSON metadata that can be embedded into Qt plugins.

Additional plugin-specific metadata can be retrieved by directly reading from the QJsonObject returned by KPluginMetaData::rawData().

This class can be used instead of KPluginInfo from KService for applications that only load Qt C++ plugins.

The following keys will be read from an object "KPlugin" inside the metadata JSON:

Key	Accessor function	JSON Type
Name	name()	string
Description	description()	string
ExtraInformation	extraInformation()	string
Icon	iconName()	string
Authors	authors()	object array (KAboutPerson)
Category	category()	string
License	license()	string
Copyright	copyrightText()	string
Id	pluginId()	string
Version	version()	string
Website	website()	string
EnabledByDefault	isEnabledByDefault()	bool
ServiceTypes	serviceTypes()	string array
MimeTypes	mimeTypes()	string array
FormFactors	formFactors()	string array
Translators	translators()	object array (KAboutPerson)
OtherContributors	otherContributors()	object array (KAboutPerson)

The Authors, Translators and OtherContributors keys are expected to be list of objects that match the structure expected by KAboutPerson::fromJSON().

An example metadata json file could look like this:

{
  "KPlugin": {
     "Name": "Date and Time",
     "Description": "Date and time by timezone",
     "Icon": "preferences-system-time",
     "Authors": { "Name": "Aaron Seigo", "Email": "[email protected]" },
     "Category": "Date and Time",
     "EnabledByDefault": "true",
     "License": "LGPL",
     "Id": "time",
     "Version": "1.0",
     "Website": "https://plasma.kde.org/",
     "ServiceTypes": ["Plasma/DataEngine"]
  }
}

See also: KAboutPerson::fromJSON()

Since: 5.1

Definition at line 85 of file kpluginmetadata.h.

Constructor & Destructor Documentation

KPluginMetaData::KPluginMetaData ( )

Creates an invalid KPluginMetaData instance.

Definition at line 29 of file kpluginmetadata.cpp.

KPluginMetaData::KPluginMetaData ( const KPluginLoader & loader )

Reads the plugin metadata from a KPluginLoader instance.

You must call KPluginLoader::setFileName() or use the appropriate constructor on loader before calling this.

Definition at line 85 of file kpluginmetadata.cpp.

KPluginMetaData::KPluginMetaData ( const QPluginLoader & loader )

Reads the plugin metadata from a QPluginLoader instance.

You must call QPluginLoader::setFileName() or use the appropriate constructor on loader before calling this.

Definition at line 79 of file kpluginmetadata.cpp.

KPluginMetaData::KPluginMetaData ( const QString & file )

Reads the plugin metadata from a plugin or .desktop which can be loaded from file.

For plugins, platform-specific library suffixes may be omitted since file will be resolved using the same logic as QPluginLoader.

If the file name ends with ".desktop", the .desktop file will be parsed instead of reading the metadata from the QPluginLoader. This is the same as calling KPluginMetaData::fromDesktopFile() without the serviceTypes parameter.

If file ends with .json, the file will be loaded as the QJsonObject metadata.

See also: QPluginLoader::setFileName(); KPluginMetaData::fromDesktopFile()

Definition at line 52 of file kpluginmetadata.cpp.

KPluginMetaData::KPluginMetaData	(	const QJsonObject &	metaData,
		const QString &	file
	)

Creates a KPluginMetaData from a QJsonObject holding the metadata and a file name This can be used if the data is not retrieved from a Qt C++ plugin library but from some other source.

See also: KPluginMetaData(const QJsonObject &, const QString &, const QString &)

Definition at line 91 of file kpluginmetadata.cpp.

KPluginMetaData::KPluginMetaData	(	const QJsonObject &	metaData,
		const QString &	pluginFile,
		const QString &	metaDataFile
	)

Creates a KPluginMetaData.

Parameters

metaData	the JSON metadata to use for this object
pluginFile	the file that the plugin can be loaded from
metaDataFile	the file that the JSON metadata was read from

This can be used if the data is not retrieved from a Qt C++ plugin library but from some other source.

Since: 5.5

Definition at line 97 of file kpluginmetadata.cpp.

KPluginMetaData::KPluginMetaData ( const KPluginMetaData & other )

Copy contructor.

Definition at line 33 of file kpluginmetadata.cpp.

KPluginMetaData::~KPluginMetaData ( )

Destructor.

Definition at line 48 of file kpluginmetadata.cpp.

Member Function Documentation

QList<KAboutPerson> KPluginMetaData::authors ( ) const

Returns: the author(s) of this plugin.

QString KPluginMetaData::category ( ) const

Returns: the categories of this plugin (e.g. "playlist/skin").

QString KPluginMetaData::copyrightText ( ) const

Returns: a short copyright statement

Since: 5.18

QStringList KPluginMetaData::dependencies ( ) const

Returns: a list of plugins that this plugin depends on so that it can function properly

See also: KJsonPluginInfo::pluginId()

Deprecated:: Since 5.79, plugin dependencies are deprecated and will be removed in KF6

QString KPluginMetaData::description ( ) const

Returns: a short description of the plugin.

QString KPluginMetaData::extraInformation ( ) const

Returns: additional information about this plugin (e.g. for use in an "about plugin" dialog)

Since: 5.18

QString KPluginMetaData::fileName ( ) const

Returns: the path to the plugin. This string can be passed to the KPluginLoader or QPluginLoader constructors in order to attempt to load this plugin.

Note: It is not guaranteed that this is a valid path to a shared library (i.e. loadable by QPluginLoader) since the metadata could also refer to a non-C++ plugin.

QStringList KPluginMetaData::formFactors ( ) const

Returns: A string list of formfactors this plugin is useful for, e.g. desktop, tablet, handset, mediacenter, etc. The keys for this are not formally defined.

Since: 5.12

KPluginMetaData KPluginMetaData::fromDesktopFile	(	const QString &	file,
		const QStringList &	serviceTypes = `QStringList()`
	)

static

Load a KPluginMetaData instace from a .desktop file.

Unlike the constructor which takes a single file parameter this method allows you to specify which service type files should be parsed to determine the correct type for a given .desktop property. This ensures that a e.g. comma-separated string list field in the .desktop file will correctly be converted to a JSON string array.

Note: This function mostly exists for backwards-compatibility. It is recommended that new applications load JSON files directly instead of using .desktop files for plugin metadata.

Parameters

file	the .desktop file to load
serviceTypes	a list of files to parse If one of these paths is a relative path it will be resolved relative to the "kservicetypes5" subdirectory in QStandardPaths::GenericDataLocation. If the list is empty only the default set of properties will be treated specially and all other entries will be read as the JSON string type.

Since: 5.16

Definition at line 107 of file kpluginmetadata.cpp.

QString KPluginMetaData::iconName ( ) const

Returns: the icon name for this plugin

See also: QIcon::fromTheme()

int KPluginMetaData::initialPreference ( ) const

Returns: the initial preference of the plugin. This is the preference to associate with this plugin initially (before the user has had any chance to define preferences for it). Higher values indicate stronger preference.

Since: 5.67

QObject * KPluginMetaData::instantiate ( ) const

Tries to instantiate this plugin using KPluginMetaData::fileName().

Note: The value of KPluginMetaData::dependencies() is not used here, dependencies must be resolved manually.

Returns: The plugin root object or nullptr if it could not be loaded

See also: QPluginLoader::instance(), KPluginLoader::instance()

Definition at line 399 of file kpluginmetadata.cpp.

bool KPluginMetaData::isEnabledByDefault ( ) const

Returns: whether the plugin should be enabled by default. This is only a recommendation, applications can ignore this value if they want to.

bool KPluginMetaData::isHidden ( ) const

Returns: whether this object should be hidden, this is usually not used for binary plugins, when loading a KPluginMetaData from a .desktop file, this will reflect the value of the "Hidden" key.

Since: 5.8

bool KPluginMetaData::isValid ( ) const

Returns: whether this object holds valid information about a plugin. If this is true pluginId() will return a non-empty string.

QString KPluginMetaData::license ( ) const

Returns: the short license identifier (e.g. LGPL).

See also: KAboutLicense::byKeyword() for retrieving the full license information

QString KPluginMetaData::licenseText ( ) const

Returns: the text of the license, equivalent to KAboutLicense::byKeyword(license()).text()

Since: 5.73

QString KPluginMetaData::metaDataFileName ( ) const

Returns: the file that the metadata was read from. This is not necessarily the same as fileName(), since not all plugins have the metadata embedded. The metadata could also be stored in a separate .desktop file.

Since: 5.5

QStringList KPluginMetaData::mimeTypes ( ) const

Returns: a list of MIME types this plugin can handle (e.g. "application/pdf", "image/png", etc.)

Since: 5.16

QString KPluginMetaData::name ( ) const

Returns: the user visible name of the plugin.

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

inline

Returns: true if this object is not equal to other, otherwise false.

Definition at line 434 of file kpluginmetadata.h.

KPluginMetaData & KPluginMetaData::operator= ( const KPluginMetaData & other )

Copy assignment.

Definition at line 40 of file kpluginmetadata.cpp.

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

Returns: true if this object is equal to other, otherwise false

Definition at line 394 of file kpluginmetadata.cpp.

QList<KAboutPerson> KPluginMetaData::otherContributors ( ) const

Returns: a list of people that contributed to this plugin (other than the authors and translators).

Since: 5.18

QString KPluginMetaData::pluginId ( ) const

Returns: the internal name of the plugin If the Id property is not set in the metadata, this will return the plugin file name without the file extension.

QJsonObject KPluginMetaData::rawData ( ) const

Returns: the full metadata stored inside the plugin file.

QStringList KPluginMetaData::readStringList	(	const QJsonObject &	jo,
		const QString &	key
	)

static

Returns: the value for key inside jo as a string list. If the type of key is string, a list with containing just that string will be returned, if it is an array the list will contain one entry for each array member. If the key cannot be found an empty list will be returned.

Definition at line 163 of file kpluginmetadata.cpp.

QString KPluginMetaData::readTranslatedString	(	const QJsonObject &	jo,
		const QString &	key,
		const QString &	defaultValue = `QString()`
	)

static

Returns: the translated value of key from jo as a string or defaultValue if key was not found or the value for key is not of type string

See also: KPluginMetaData::readTranslatedValue(const QJsonObject &jo, const QString &key)

Definition at line 204 of file kpluginmetadata.cpp.

QJsonValue KPluginMetaData::readTranslatedValue	(	const QJsonObject &	jo,
		const QString &	key,
		const QJsonValue &	defaultValue = `QJsonValue()`
	)

static

Reads a value from jo but unlike QJsonObject::value() it allows different entries for each locale This is done by appending the locale identifier in brackets to the key (e.g.

"[de_DE]" or "[es]") When looking for a key "foo" with German (Germany) locale we will first attempt to read "foo[de_DE]", if that does not exist "foo[de]", finally falling back to "foo" if that also doesn't exist.

Returns: the translated value for key from jo or defaultValue if key was not found

Definition at line 184 of file kpluginmetadata.cpp.

QStringList KPluginMetaData::serviceTypes ( ) const

Returns the service types that this plugin implements.

This is mostly for historical / compatibility purposes. As a general rule, instead of opening many plugins to then filter by servicetype, put all plugins of the same type in a subdirectory, that you can pass to findPlugins directly. No point in opening 20 plugins to pick out only 3, when the filesystem can do that filtering for you.

Note: Unlike KService this does not contain the MIME types. To get the handled MIME types use the KPluginMetaData::mimeTypes() function.

Returns: a list of service types this plugin implements (e.g. "Plasma/DataEngine")

bool KPluginMetaData::supportsMimeType ( const QString & mimeType ) const

Returns: true if this plugin can handle the given mimetype This is more accurate than mimeTypes().contains(mimeType) because it also takes MIME type inheritance into account.

Since: 5.66

Definition at line 335 of file kpluginmetadata.cpp.

QList<KAboutPerson> KPluginMetaData::translators ( ) const

Returns: the translator(s) of this plugin.

Since: 5.18

QString KPluginMetaData::value	(	const QString &	key,
		const QString &	defaultValue = `QString()`
	)		const

Returns: the value for key from the metadata or defaultValue if the key does not exist or the value for key is not of type string

See also: KPluginMetaData::rawData() if QString is not the correct type for key

Definition at line 371 of file kpluginmetadata.cpp.

QString KPluginMetaData::version ( ) const

Returns: the version of the plugin.

QString KPluginMetaData::website ( ) const

Returns: the website of the plugin.

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

KDE's Doxygen guidelines are available online.

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KPluginMetaData

Properties

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation