/usr/include/KF5/KCoreAddons/kpluginfactory.h is in libkf5coreaddons-dev 5.18.0-0ubuntu1.
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Copyright (C) 2007 Matthias Kretz <kretz@kde.org>
Copyright (C) 2007 Bernhard Loos <nhuh.put@web.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
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 KPLUGINFACTORY_H
#define KPLUGINFACTORY_H
#include "kcoreaddons_export.h"
#include <QtCore/QObject>
#include <QtCore/QVariant>
#include <QtCore/QStringList>
#include <kexportplugin.h> // for source compat
class KPluginFactoryPrivate;
namespace KParts
{
class Part;
}
#define KPluginFactory_iid "org.kde.KPluginFactory"
#define K_PLUGIN_FACTORY_DECLARATION_WITH_BASEFACTORY_SKEL(name, baseFactory, ...) \
class name : public KPluginFactory \
{ \
Q_OBJECT \
Q_INTERFACES(KPluginFactory) \
__VA_ARGS__ \
public: \
explicit name(); \
~name(); \
private: \
void init(); \
};
#define K_PLUGIN_FACTORY_DECLARATION_WITH_BASEFACTORY_JSON(name, baseFactory, json) \
K_PLUGIN_FACTORY_DECLARATION_WITH_BASEFACTORY_SKEL(name, baseFactory, Q_PLUGIN_METADATA(IID KPluginFactory_iid FILE json))
#define K_PLUGIN_FACTORY_DECLARATION_WITH_BASEFACTORY(name, baseFactory) \
K_PLUGIN_FACTORY_DECLARATION_WITH_BASEFACTORY_SKEL(name, baseFactory, Q_PLUGIN_METADATA(IID KPluginFactory_iid))
#define K_PLUGIN_FACTORY_DEFINITION_WITH_BASEFACTORY(name, baseFactory, pluginRegistrations) \
name::name() \
{ \
pluginRegistrations \
} \
name::~name() {}
#define K_PLUGIN_FACTORY_WITH_BASEFACTORY(name, baseFactory, pluginRegistrations) \
K_PLUGIN_FACTORY_DECLARATION_WITH_BASEFACTORY(name, baseFactory) \
K_PLUGIN_FACTORY_DEFINITION_WITH_BASEFACTORY(name, baseFactory, pluginRegistrations)
#define K_PLUGIN_FACTORY_WITH_BASEFACTORY_JSON(name, baseFactory, jsonFile, pluginRegistrations) \
K_PLUGIN_FACTORY_DECLARATION_WITH_BASEFACTORY_JSON(name, baseFactory, jsonFile) \
K_PLUGIN_FACTORY_DEFINITION_WITH_BASEFACTORY(name, baseFactory, pluginRegistrations)
/**
* \relates KPluginFactory
*
* Create a KPluginFactory subclass and export it as the root plugin object.
*
* \param name The name of the KPluginFactory derived class.
*
* \param pluginRegistrations Code to be inserted into the constructor of the
* class. Usually a series of registerPlugin() calls.
*
* Example:
* \code
* #include <KPluginFactory>
* #include <plugininterface.h>
*
* class MyPlugin : public PluginInterface
* {
* public:
* MyPlugin(QObject *parent, const QVariantList &args)
* : PluginInterface(parent)
* {}
* };
*
* K_PLUGIN_FACTORY(MyPluginFactory,
* registerPlugin<MyPlugin>();
* )
*
* #include <myplugin.moc>
* \endcode
*
* If you want to compile a .json file into the plugin, use K_PLUGIN_FACTORY_WITH_JSON.
*
* \see K_PLUGIN_FACTORY_WITH_JSON
* \see K_PLUGIN_FACTORY_DECLARATION
* \see K_PLUGIN_FACTORY_DEFINITION
*/
#define K_PLUGIN_FACTORY(name, pluginRegistrations) K_PLUGIN_FACTORY_WITH_BASEFACTORY(name, KPluginFactory, pluginRegistrations)
/**
* \relates KPluginFactory
*
* Create a KPluginFactory subclass and export it as the root plugin object with
* JSON metadata.
*
* This macro does the same as K_PLUGIN_FACTORY, but adds a JSON file as plugin
* metadata. See Q_PLUGIN_METADATA() for more information.
*
* \param name The name of the KPluginFactory derived class.
*
* \param pluginRegistrations Code to be inserted into the constructor of the
* class. Usually a series of registerPlugin() calls.
*
* \param jsonFile Name of the json file to be compiled into the plugin as metadata
*
* Example:
* \code
* #include <KPluginFactory>
* #include <plugininterface.h>
*
* class MyPlugin : public PluginInterface
* {
* public:
* MyPlugin(QObject *parent, const QVariantList &args)
* : PluginInterface(parent)
* {}
* };
*
* K_PLUGIN_FACTORY_WITH_JSON(MyPluginFactory,
* "metadata.json",
* registerPlugin<MyPlugin>();
* )
*
* #include <myplugin.moc>
* \endcode
*
* \see K_PLUGIN_FACTORY
* \see K_PLUGIN_FACTORY_DECLARATION
* \see K_PLUGIN_FACTORY_DEFINITION
*
* @since 5.0
*/
#define K_PLUGIN_FACTORY_WITH_JSON(name, jsonFile, pluginRegistrations) K_PLUGIN_FACTORY_WITH_BASEFACTORY_JSON(name, KPluginFactory, jsonFile, pluginRegistrations)
/**
* \relates KPluginFactory
*
* K_PLUGIN_FACTORY_DECLARATION declares the KPluginFactory subclass. This macro
* can be used in a header file.
*
* \param name The name of the KPluginFactory derived class.
*
* \see K_PLUGIN_FACTORY
* \see K_PLUGIN_FACTORY_DEFINITION
*/
#define K_PLUGIN_FACTORY_DECLARATION(name) K_PLUGIN_FACTORY_DECLARATION_WITH_BASEFACTORY(name, KPluginFactory)
/**
* \relates KPluginFactory
* K_PLUGIN_FACTORY_DEFINITION defines the KPluginFactory subclass. This macro
* can <b>not</b> be used in a header file.
*
* \param name The name of the KPluginFactory derived class.
*
* \param pluginRegistrations Code to be inserted into the constructor of the
* class. Usually a series of registerPlugin() calls.
*
* \see K_PLUGIN_FACTORY
* \see K_PLUGIN_FACTORY_DECLARATION
*/
#define K_PLUGIN_FACTORY_DEFINITION(name, pluginRegistrations) K_PLUGIN_FACTORY_DEFINITION_WITH_BASEFACTORY(name, KPluginFactory, pluginRegistrations)
/**
* \class KPluginFactory kpluginfactory.h <KPluginFactory>
*
* KPluginFactory provides a convenient way to provide factory-style plugins.
* Qt plugins provide a singleton object, but a common pattern is for plugins
* to generate as many objects of a particular type as the application requires.
* By using KPluginFactory, you can avoid implementing the factory pattern
* yourself.
*
* KPluginFactory also allows plugins to provide multiple different object
* types, indexed by keywords.
*
* The objects created by KPluginFactory must inherit QObject, and must have a
* standard constructor pattern:
* \li if the object is a KPart::Part, it must be of the form
* \code
* T(QWidget *parentWidget, QObject *parent, const QVariantList &args)
* \endcode
* \li if it is a QWidget, it must be of the form
* \code
* T(QWidget *parent, const QVariantList &args)
* \endcode
* \li otherwise it must be of the form
* \code
* T(QObject *parent, const QVariantList &args)
* \endcode
*
* You should typically use either K_PLUGIN_FACTORY() or
* K_PLUGIN_FACTORY_WITH_JSON() in your plugin code to create the factory. The
* typical pattern is
*
* \code
* #include <KPluginFactory>
* #include <plugininterface.h>
*
* class MyPlugin : public PluginInterface
* {
* public:
* MyPlugin(QObject *parent, const QVariantList &args)
* : PluginInterface(parent)
* {}
* };
*
* K_PLUGIN_FACTORY(MyPluginFactory,
* registerPlugin<MyPlugin>();
* )
* #include <myplugin.moc>
* \endcode
*
* If you want to write a custom KPluginFactory not using the standard macro(s)
* you can reimplement the
* create(const char *iface, QWidget *parentWidget, QObject *parent, const QVariantList &args, const QString &keyword)
* method.
*
* Example:
* \code
* class SomeScriptLanguageFactory : public KPluginFactory
* {
* Q_OBJECT
* public:
* SomeScriptLanguageFactory()
* {}
*
* protected:
* virtual QObject *create(const char *iface, QWidget *parentWidget, QObject *parent, const QVariantList &args, const QString &keyword)
* {
* const QString identifier = QLatin1String(iface) + QLatin1Char('_') + keyword;
* // load scripting language module from the information in identifier
* // and return it:
* return object;
* }
* };
* \endcode
*
* If you want to load a library use KPluginLoader.
* The application that wants to instantiate plugin classes can do the following:
* \code
* KPluginFactory *factory = KPluginLoader("libraryname").factory();
* if (factory) {
* PluginInterface *p1 = factory->create<PluginInterface>(parent);
* OtherInterface *p2 = factory->create<OtherInterface>(parent);
* NextInterface *p3 = factory->create<NextInterface>("keyword1", parent);
* NextInterface *p3 = factory->create<NextInterface>("keyword2", parent);
* }
* \endcode
*
* \author Matthias Kretz <kretz@kde.org>
* \author Bernhard Loos <nhuh.put@web.de>
*/
class KCOREADDONS_EXPORT KPluginFactory : public QObject
{
Q_OBJECT
Q_DECLARE_PRIVATE(KPluginFactory)
public:
/**
* This constructor creates a factory for a plugin.
*/
explicit KPluginFactory();
/**
* This destroys the PluginFactory.
*/
virtual ~KPluginFactory();
/**
* Use this method to create an object. It will try to create an object which inherits
* \p T. If it has multiple choices, you will get a fatal error (kFatal()), so be careful
* to request a unique interface or use keywords.
*
* \tparam T The interface for which an object should be created. The object will inherit \p T.
* \param parent The parent of the object. If \p parent is a widget type, it will also passed
* to the parentWidget argument of the CreateInstanceFunction for the object.
* \param args Additional arguments which will be passed to the object.
* \returns A pointer to the created object is returned, or 0 if an error occurred.
*/
template<typename T>
T *create(QObject *parent = 0, const QVariantList &args = QVariantList());
/**
* Use this method to create an object. It will try to create an object which inherits
* \p T and was registered with \p keyword.
*
* \tparam T The interface for which an object should be created. The object will inherit \p T.
* \param keyword The keyword of the object.
* \param parent The parent of the object. If \p parent is a widget type, it will also passed
* to the parentWidget argument of the CreateInstanceFunction for the object.
* \param args Additional arguments which will be passed to the object.
* \returns A pointer to the created object is returned, or 0 if an error occurred.
*/
template<typename T>
T *create(const QString &keyword, QObject *parent = 0, const QVariantList &args = QVariantList());
/**
* Use this method to create an object. It will try to create an object which inherits
* \p T and was registered with \p keyword.
* This overload has an additional \p parentWidget argument, which is used by some plugins (e.g. Parts).
* \tparam T The interface for which an object should be created. The object will inherit \p T.
* \param parentWidget An additional parent widget.
* \param parent The parent of the object. If \p parent is a widget type, it will also passed
* to the parentWidget argument of the CreateInstanceFunction for the object.
* \param keyword The keyword of the object.
* \param args Additional arguments which will be passed to the object.
* \returns A pointer to the created object is returned, or 0 if an error occurred.
*/
template<typename T>
T *create(QWidget *parentWidget, QObject *parent, const QString &keyword = QString(), const QVariantList &args = QVariantList());
/**
* @deprecated
*/
#ifndef KCOREADDONS_NO_DEPRECATED
template<typename T>
KCOREADDONS_DEPRECATED
T *create(QObject *parent, const QStringList &args)
{
return create<T>(parent, stringListToVariantList(args));
}
#endif
/**
* @deprecated
*/
#ifndef KCOREADDONS_NO_DEPRECATED
KCOREADDONS_DEPRECATED QObject *create(QObject *parent = 0, const char *classname = "QObject", const QStringList &args = QStringList())
{
return create(classname, 0, parent, stringListToVariantList(args), QString());
}
#endif
/**
* \internal
* Converts a QStringList to a QVariantList
*/
static QVariantList stringListToVariantList(const QStringList &list);
/**
* \internal
* Converts a QVariantList of strings to a QStringList
*/
static QStringList variantListToStringList(const QVariantList &list);
Q_SIGNALS:
void objectCreated(QObject *object);
protected:
/**
* Function pointer type to a function that instantiates a plugin.
*/
typedef QObject *(*CreateInstanceFunction)(QWidget *, QObject *, const QVariantList &);
/**
* This is used to detect the arguments need for the constructor of plugin classes.
* You can inherit it, if you want to add new classes and still keep support for the old ones.
*/
template<class impl>
struct InheritanceChecker {
CreateInstanceFunction createInstanceFunction(KParts::Part *)
{
return &createPartInstance<impl>;
}
CreateInstanceFunction createInstanceFunction(QWidget *)
{
return &createInstance<impl, QWidget>;
}
CreateInstanceFunction createInstanceFunction(...)
{
return &createInstance<impl, QObject>;
}
};
explicit KPluginFactory(KPluginFactoryPrivate &dd);
/**
* Registers a plugin with the factory. Call this function from the constructor of the
* KPluginFactory subclass to make the create function able to instantiate the plugin when asked
* for an interface the plugin implements.
*
* You can register as many plugin classes as you want as long as either the plugin interface or
* the \p keyword makes it unique. E.g. it is possible to register a KCModule and a
* KParts::Part without having to specify keywords since their interfaces differ.
*
* \tparam T the name of the plugin class
*
* \param keyword An optional keyword as unique identifier for the plugin. This allows you to
* put more than one plugin with the same interface into the same library using the same
* factory. X-KDE-PluginKeyword is a convenient way to specify the keyword in a desktop file.
*
* \param instanceFunction A function pointer to a function that creates an instance of the
* plugin. The default function that will be used depends on the type of interface. If the
* interface inherits from
* \li \c KParts::Part the function will call
* \code
* new T(QWidget *parentWidget, QObject *parent, const QVariantList &args)
* \endcode
* \li \c QWidget the function will call
* \code
* new T(QWidget *parent, const QVariantList &args)
* \endcode
* \li else the function will call
* \code
* new T(QObject *parent, const QVariantList &args)
* \endcode
*/
template<class T>
void registerPlugin(const QString &keyword = QString(), CreateInstanceFunction instanceFunction
= InheritanceChecker<T>().createInstanceFunction(reinterpret_cast<T *>(0)))
{
registerPlugin(keyword, &T::staticMetaObject, instanceFunction);
}
KPluginFactoryPrivate *const d_ptr;
/**
* @deprecated
*/
#ifndef KCOREADDONS_NO_DEPRECATED
virtual KCOREADDONS_DEPRECATED QObject *createObject(QObject *parent, const char *className, const QStringList &args);
#endif
/**
* @deprecated
*/
#ifndef KCOREADDONS_NO_DEPRECATED
virtual KCOREADDONS_DEPRECATED KParts::Part *createPartObject(QWidget *parentWidget, QObject *parent, const char *classname, const QStringList &args);
#endif
/**
* This function is called when the factory asked to create an Object.
*
* You may reimplement it to provide a very flexible factory. This is especially useful to
* provide generic factories for plugins implemeted using a scripting language.
*
* \param iface The staticMetaObject::className() string identifying the plugin interface that
* was requested. E.g. for KCModule plugins this string will be "KCModule".
* \param parentWidget Only used if the requested plugin is a KPart.
* \param parent The parent object for the plugin object.
* \param args A plugin specific list of arbitrary arguments.
* \param keyword A string that uniquely identifies the plugin. If a KService is used this
* keyword is read from the X-KDE-PluginKeyword entry in the .desktop file.
*/
virtual QObject *create(const char *iface, QWidget *parentWidget, QObject *parent, const QVariantList &args, const QString &keyword);
template<class impl, class ParentType>
static QObject *createInstance(QWidget *parentWidget, QObject *parent, const QVariantList &args)
{
Q_UNUSED(parentWidget);
ParentType *p = 0;
if (parent) {
p = qobject_cast<ParentType *>(parent);
Q_ASSERT(p);
}
return new impl(p, args);
}
template<class impl>
static QObject *createPartInstance(QWidget *parentWidget, QObject *parent, const QVariantList &args)
{
return new impl(parentWidget, parent, args);
}
private:
void registerPlugin(const QString &keyword, const QMetaObject *metaObject, CreateInstanceFunction instanceFunction);
};
typedef KPluginFactory KLibFactory;
template<typename T>
inline T *KPluginFactory::create(QObject *parent, const QVariantList &args)
{
QObject *o = create(T::staticMetaObject.className(), parent && parent->isWidgetType() ? reinterpret_cast<QWidget *>(parent) : 0, parent, args, QString());
T *t = qobject_cast<T *>(o);
if (!t) {
delete o;
}
return t;
}
template<typename T>
inline T *KPluginFactory::create(const QString &keyword, QObject *parent, const QVariantList &args)
{
QObject *o = create(T::staticMetaObject.className(), parent && parent->isWidgetType() ? reinterpret_cast<QWidget *>(parent) : 0, parent, args, keyword);
T *t = qobject_cast<T *>(o);
if (!t) {
delete o;
}
return t;
}
template<typename T>
inline T *KPluginFactory::create(QWidget *parentWidget, QObject *parent, const QString &keyword, const QVariantList &args)
{
QObject *o = create(T::staticMetaObject.className(), parentWidget, parent, args, keyword);
T *t = qobject_cast<T *>(o);
if (!t) {
delete o;
}
return t;
}
Q_DECLARE_INTERFACE(KPluginFactory, KPluginFactory_iid)
#endif // KPLUGINFACTORY_H
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