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/************************************************************************
*
* Copyright (C) 2009-2025 IRCAD France
* Copyright (C) 2012-2019 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight 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 3 of the License, or
* (at your option) any later version.
*
* Sight 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 Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#pragma once
#include <sight/io/__/config.hpp>
#include <core/base.hpp>
#include <core/object.hpp>
namespace sight::core::progress
{
class observer;
} // namespace sight::core::progress
namespace sight::io::reader
{
/**
* @brief Base class for all object readers.
*
* This class defines the API to use basic object readers. This reader is not a
* service. Their equivalent exist as services. See io::service::reader. To read an
* object with this class, use setLocation and setObject method before executing
* the method read. Reading modifies the object given in parameter with the
* method set_object.
*/
class SIGHT_IO_CLASS_API object_reader : public core::base_object
{
public:
SIGHT_DECLARE_CLASS(object_reader, core::base_object);
/// Destructor. Does nothing.
SIGHT_IO_API ~object_reader() override = default;
/**
* @brief Defines an reader interface.
*
* This method (re)inits the object given in parameter of set_object method.
*/
SIGHT_IO_API virtual void read(SPTR(sight::core::progress::observer) _progress) = 0;
/**
* @brief m_object setter.
* @param[out] _p_object replaces weakptr m_object of the instance reader
* @note m_object is saved in class with a weakptr
* @note This object can be get with the method get_object()
*/
SIGHT_IO_API virtual void set_object(core::object::sptr _p_object);
/**
* @brief m_object getter.
*
* @return m_object
* @note m_object is saved in reader with a weakptr
*/
SIGHT_IO_API virtual core::object::sptr get_object() const;
SIGHT_IO_API virtual std::string extension() const = 0;
protected:
/**
* @brief Object result of reading process.
*
* This object is given in parameter of set_object method but it is conserved with a weakptr.
*/
core::object::wptr m_object;
};
} // namespace sight::io::reader
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