ioplugin.h

/*
    SPDX-FileCopyrightText: 2022 Volker Krause <vkrause@kde.org>
    SPDX-License-Identifier: LGPL-2.0-or-later
*/
 
#ifndef OSM_IOPLUGIN_H
#define OSM_IOPLUGIN_H
 
#include "kosm_export.h"
#include "abstractwriter.h"
 
#include <QtPlugin>
 
#include <memory>
 
namespace OSM {
 
class AbstractReader;
class AbstractWriter;
class DataSet;
 
/** Plugin interface for OSM file/data readers. */
class KOSM_EXPORT IOPluginInterface
{
public:
    virtual ~IOPluginInterface();
 
    /** Create a new reader instance. */
    [[nodiscard]] virtual std::unique_ptr<AbstractReader> createReader(OSM::DataSet *dataSet) = 0;
    /** Create a new writer instance. */
    [[nodiscard]] virtual std::unique_ptr<AbstractWriter> createWriter() = 0;
};
 
template <typename ReaderT, typename WriterT = std::nullptr_t>
class IOPlugin : public IOPluginInterface
{
public:
    [[nodiscard]] inline std::unique_ptr<AbstractReader> createReader(OSM::DataSet *dataSet) override
    {
        return std::make_unique<ReaderT>(dataSet);
    }
    [[nodiscard]] inline std::unique_ptr<AbstractWriter> createWriter() override
    {
        if constexpr(!std::is_same_v<WriterT, std::nullptr_t>) {
            return std::make_unique<WriterT>();
        }
        return {};
    }
};
 
}
 
#define OSMIOPluginInteraface_iid "org.kde.kosm.IOPluginInterface/1.0"
Q_DECLARE_INTERFACE(OSM::IOPluginInterface, OSMIOPluginInteraface_iid)
 
#endif // OSM_IOPLUGIN_H