File indexing completed on 2024-05-19 05:26:10

 /*
  * Copyright (C) 2014 Christian Mollekopf <chrigi_1@fastmail.fm>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) version 3, or any
  * later version accepted by the membership of KDE e.V. (or its
  * successor approved by the membership of KDE e.V.), which shall
  * act as a proxy defined in Section 6 of version 3 of the license.
  *
  * 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #pragma once
 
 #include "sink_export.h"
 #include <QByteArray>
 #include <QDebug>
 #include <QMutex>
 #include <functional>
 #include <memory>
 
 #include "facadeinterface.h"
 #include "applicationdomaintype.h"
 #include "resourcecontext.h"
 #include "log.h"
 
 namespace Sink {
 
 /**
  * Facade factory that returns a store facade implementation, by loading a plugin and providing the relevant implementation.
  *
  * If we were to provide default implementations for certain capabilities. Here would be the place to do so.
  */
 class SINK_EXPORT FacadeFactory
 {
 public:
     typedef std::function<std::shared_ptr<void>(const ResourceContext &)> FactoryFunction;
 
     void registerStaticFacades();
 
     static FacadeFactory &instance();
 
     static QByteArray key(const QByteArray &resource, const QByteArray &type);
 
     template <class DomainType, class Facade>
     void registerFacade(const QByteArray &resource)
     {
         registerFacade(resource, [](const ResourceContext &context) { return std::make_shared<Facade>(context); }, ApplicationDomain::getTypeName<DomainType>());
     }
 
     template <class DomainType, class Facade>
     void registerFacade()
     {
         registerFacade(QByteArray(), [](const ResourceContext &) { return std::make_shared<Facade>(); }, ApplicationDomain::getTypeName<DomainType>());
     }
 
     /*
      * Allows the registrar to register a specific instance.
      *
      * Primarily for testing.
      */
     template <class DomainType, class Facade>
     void registerFacade(const QByteArray &resource, const FactoryFunction &customFactoryFunction)
     {
         registerFacade(resource, customFactoryFunction, ApplicationDomain::getTypeName<DomainType>());
     }
 
     /*
      * Can be used to clear the factory.
      *
      * Primarily for testing.
      */
     void resetFactory();
 
     template <class DomainType>
     std::shared_ptr<StoreFacade<DomainType>> getFacade(const QByteArray &resource, const QByteArray &instanceIdentifier)
     {
         const QByteArray typeName = ApplicationDomain::getTypeName<DomainType>();
         const auto ptr = getFacade(resource, instanceIdentifier, typeName);
         //We have to check the pointer before the cast, otherwise a check would return true also for invalid instances.
         if (!ptr) {
             return std::shared_ptr<StoreFacade<DomainType>>();
         }
         return std::static_pointer_cast<StoreFacade<DomainType>>(ptr);
     }
 
     template <class DomainType>
     std::shared_ptr<StoreFacade<DomainType>> getFacade()
     {
         return getFacade<DomainType>(QByteArray(), QByteArray());
     }
 
 private:
     FacadeFactory();
     std::shared_ptr<void> getFacade(const QByteArray &resource, const QByteArray &instanceIdentifier, const QByteArray &typeName);
     void registerFacade(const QByteArray &resource, const FactoryFunction &customFactoryFunction, const QByteArray typeName);
 
     QHash<QByteArray, FactoryFunction> mFacadeRegistry;
     static QMutex sMutex;
 };
 }