usServiceObjects.h

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/*============================================================================

  Library: CppMicroServices

  Copyright (c) German Cancer Research Center (DKFZ)
  All rights reserved.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

============================================================================*/

#ifndef USSERVICEOBJECTS_H
#define USSERVICEOBJECTS_H

#include <usCoreExport.h>

#include <usModuleContext.h>
#include <usPrototypeServiceFactory.h>
#include <usServiceReference.h>
#include <usServiceProperties.h>

US_BEGIN_NAMESPACE

class ServiceObjectsBasePrivate;

class US_Core_EXPORT ServiceObjectsBase
{

private:

  ServiceObjectsBasePrivate* d;

protected:

  ServiceObjectsBase(ModuleContext* context, const ServiceReferenceBase& reference);

  ServiceObjectsBase(const ServiceObjectsBase& other);

  ~ServiceObjectsBase();

  ServiceObjectsBase& operator=(const ServiceObjectsBase& other);

  // Called by ServiceObjects<S> with S != void
  void* GetService() const;

  // Called by the ServiceObjects<void> specialization
  InterfaceMap GetServiceInterfaceMap() const;

  // Called by ServiceObjects<S> with S != void
  void UngetService(void* service);

  // Called by the ServiceObjects<void> specialization
  void UngetService(const InterfaceMap& interfaceMap);

  ServiceReferenceBase GetReference() const;

};

template<class S>
class ServiceObjects : private ServiceObjectsBase
{

public:

  S* GetService() const
  {
    return reinterpret_cast<S*>(this->ServiceObjectsBase::GetService());
  }

  void UngetService(S* service)
  {
    this->ServiceObjectsBase::UngetService(service);
  }

  ServiceReference<S> GetServiceReference() const
  {
    return this->ServiceObjectsBase::GetReference();
  }

private:

  friend class ModuleContext;

  ServiceObjects(ModuleContext* context, const ServiceReference<S>& reference)
    : ServiceObjectsBase(context, reference)
  {}

};

template<>
class US_Core_EXPORT ServiceObjects<void> : private ServiceObjectsBase
{

public:

  InterfaceMap GetService() const;

  void UngetService(const InterfaceMap& service);

  ServiceReferenceU GetServiceReference() const;

private:

  friend class ModuleContext;

  ServiceObjects(ModuleContext* context, const ServiceReferenceU& reference);

};

US_END_NAMESPACE

#endif // USSERVICEOBJECTS_H