/usr/include/KF5/KCoreAddons/kpluginmetadata.h is in libkf5coreaddons-dev 5.18.0-0ubuntu1.
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Copyright (C) 2014 Alex Richardson <arichardson.kde@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef KPLUGINMETADATA_H
#define KPLUGINMETADATA_H
#include "kcoreaddons_export.h"
#include <QExplicitlySharedDataPointer>
#include <QJsonObject>
#include <QString>
#include <QStringList>
#include <QVector>
#include <functional>
class KPluginLoader;
class QPluginLoader;
class QStringList;
class KPluginMetaDataPrivate;
class KAboutPerson;
class QObject;
/** 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:
* @verbatim
{
"KPlugin": {
"Name": "Date and Time",
"Description": "Date and time by timezone",
"Icon": "preferences-system-time",
"Authors": { "Name": "Aaron Seigo", "Email": "aseigo@kde.org" },
"Category": "Date and Time",
"Dependencies": [],
"EnabledByDefault": "true",
"License": "LGPL",
"Id": "time",
"Version": "1.0",
"Website": "http://plasma.kde.org/",
"ServiceTypes": ["Plasma/DataEngine"]
}
}
@endverbatim
*
* @sa KAboutPerson::fromJSON()
* @since 5.1
*/
class KCOREADDONS_EXPORT KPluginMetaData
{
public:
/** Creates an invalid KPluginMetaData instance */
KPluginMetaData();
/**
* Reads the plugin metadata from a KPluginLoader instance. You must call KPluginLoader::setFileName()
* or use the appropriate constructor on @p loader before calling this.
*/
KPluginMetaData(const KPluginLoader &loader);
/**
* Reads the plugin metadata from a QPluginLoader instance. You must call QPluginLoader::setFileName()
* or use the appropriate constructor on @p loader before calling this.
*/
KPluginMetaData(const QPluginLoader &loader);
/**
* Reads the plugin metadata from a plugin or .desktop which can be loaded from @p file.
*
* For plugins, platform-specific library suffixes may be omitted since @p 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 @p file ends with .json, the file will be loaded as the QJsonObject metadata.
*
* @see QPluginLoader::setFileName()
* @see KPluginMetaData::fromDesktopFile()
*/
KPluginMetaData(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 KPluginMetaData(const QJsonObject &, const QString &, const QString &)
*/
KPluginMetaData(const QJsonObject &metaData, const QString &file);
// TODO: KF6: merge with the above and make metaDataFile default to QString()
/**
* Creates a KPluginMetaData
* @param metaData the JSON metadata to use for this object
* @param pluginFile the file that the plugin can be loaded from
* @param 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
*/
KPluginMetaData(const QJsonObject &metaData, const QString &pluginFile, const QString &metaDataFile);
/**
* Copy contructor
*/
KPluginMetaData(const KPluginMetaData &);
/**
* Copy assignment
*/
KPluginMetaData &operator=(const KPluginMetaData &);
/**
* Destructor
*/
~KPluginMetaData();
/**
* 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.
*
* @param file the .desktop file to load
* @param 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
*/
static KPluginMetaData fromDesktopFile(const QString &file, const QStringList &serviceTypes = QStringList());
/**
* @return whether this object holds valid information about a plugin.
* If this is @c true pluginId() will return a non-empty string.
*/
bool isValid() const;
/**
* @return 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 isHidden() const;
/**
* @return 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.
*/
QString fileName() const;
/**
* @return 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
*/
QString metaDataFileName() const;
/**
* @return the full metadata stored inside the plugin file.
*/
QJsonObject rawData() const;
/**
* Tries to instantiate this plugin using KPluginMetaData::fileName().
* @note The value of KPluginMetaData::dependencies() is not used here, dependencies must be
* resolved manually.
*
* @return The plugin root object or @c nullptr if it could not be loaded
* @see QPluginLoader::instance(), KPluginLoader::instance()
*/
QObject *instantiate() const;
/**
* @return the user visible name of the plugin.
*/
QString name() const;
/**
* @return a short description of the plugin.
*/
QString description() const;
/**
* @return additional information about this plugin (e.g. for use in an "about plugin" dialog)
*
* @since 5.18
*/
QString extraInformation() const;
/**
* @return the author(s) of this plugin.
*/
QList<KAboutPerson> authors() const;
/**
* @return the translator(s) of this plugin.
*
* @since 5.18
*/
QList<KAboutPerson> translators() const;
/**
* @return a list of people that contributed to this plugin (other than the authors and translators).
*
* @since 5.18
*/
QList<KAboutPerson> otherContributors() const;
/**
* @return the categories of this plugin (e.g. "playlist/skin").
*/
QString category() const;
/**
* @return the icon name for this plugin
* @see QIcon::fromTheme()
*/
QString iconName() const;
/**
* @return the short license identifier (e.g. LGPL).
* @see KAboutLicense::byKeyword() for retrieving the full license information
*/
QString license() const;
/**
* @return a short copyright statement
*
* @since 5.18
*/
QString copyrightText() const;
/**
* @return the internal name of the plugin (for KParts Plugins this is
* the same name as set in the .rc file). If the plugin name property is not set in
* the metadata this will return the plugin file name without the file extension.
*/
QString pluginId() const;
/**
* @return the version of the plugin.
*/
QString version() const;
/**
* @return the website of the plugin.
*/
QString website() const;
/**
* @return a list of plugins that this plugin depends on so that it can function properly
* @see KJsonPluginInfo::pluginId()
*/
QStringList dependencies() const;
/**
* @note Unlike KService this does not contain the MIME types. To get the handled MIME types
* use the KPluginMetaData::mimeTypes() function.
* @return a list of service types this plugin implements (e.g. "Plasma/DataEngine")
*/
QStringList serviceTypes() const;
/**
* @return a list of MIME types this plugin can handle (e.g. "application/pdf", "image/png", etc.)
* @since 5.16
*/
QStringList mimeTypes() const;
/**
* @return 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
*/
QStringList formFactors() const;
/**
* @return whether the plugin should be enabled by default.
* This is only a recommendation, applications can ignore this value if they want to.
*/
bool isEnabledByDefault() const;
/**
* @return the value for @p key from the metadata or @p defaultValue if the key does not exist
* or the value for @p key is not of type string
*
* @see KPluginMetaData::rawData() if QString is not the correct type for @p key
*/
QString value(const QString &key, const QString &defaultValue = QString()) const;
/** @return the value for @p key inside @p jo as a string list. If the type of @p 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.
*/
static QStringList readStringList(const QJsonObject &jo, const QString &key);
/**
* Reads a value from @p 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.
* @return the translated value for @p key from @p jo or @p defaultValue if @p key was not found
*/
static QJsonValue readTranslatedValue(const QJsonObject &jo, const QString &key, const QJsonValue &defaultValue = QJsonValue());
/**
* @return the translated value of @p key from @p jo as a string or @p defaultValue if @p key was not found
* or the value for @p key is not of type string
* @see KPluginMetaData::readTranslatedValue(const QJsonObject &jo, const QString &key)
*/
static QString readTranslatedString(const QJsonObject &jo, const QString &key, const QString &defaultValue = QString());
/**
* @return @c true if this object is equal to @p other, otherwise @c false
*/
bool operator==(const KPluginMetaData &other) const;
/**
* @return @c true if this object is not equal to @p other, otherwise @c false.
*/
inline bool operator!=(const KPluginMetaData &other) const
{
return !(*this == other);
}
private:
QJsonObject rootObject() const;
void loadFromDesktopFile(const QString &file, const QStringList &serviceTypes);
private:
QJsonObject m_metaData;
QString m_fileName;
QExplicitlySharedDataPointer<KPluginMetaDataPrivate> d; // for future binary compatible extensions
};
inline uint qHash(const KPluginMetaData &md, uint seed)
{
return qHash(md.pluginId(), seed);
}
#endif // KPLUGINMETADATA_H
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