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/*************************************************************************
 * odil - Copyright (C) Universite de Strasbourg
 * Distributed under the terms of the CeCILL-B license, as published by
 * the CEA-CNRS-INRIA. Refer to the LICENSE file or to
 * http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html
 * for details.
 ************************************************************************/

#ifndef _9c3d8f32_0310_4e3a_b5d2_6d69f229a2cf
#define _9c3d8f32_0310_4e3a_b5d2_6d69f229a2cf

#include <cstddef>
#include <initializer_list>

#include "odil/odil.h"
#include "odil/Tag.h"
#include "odil/Value.h"
#include "odil/VR.h"

namespace odil
{

/**
 * @brief Element of a DICOM data set.
 */
class ODIL_API Element
{
public:

    /// @brief VR of the element.
    VR vr;

    /// @brief Constructor using the VR to create an according empty container.
    Element(VR const & vr);

    /// @brief Constructor.
    Element(Value const & value, VR const & vr);

    /// @brief Constructor.
    Element(Value && value, VR const & vr);

#define ODIL_ELEMENT_CONSTRUCTORS(type) \
    Element(Value::type const & value, VR const & vr=VR::INVALID); \
    Element(Value::type && value, VR const & vr=VR::INVALID); \
    Element(\
        std::initializer_list<Value::type::value_type> const & value, \
        VR const & vr=VR::INVALID);
    /*
     * No need for for a rvalue reference version of std::initializer_list:
     * copying a std::initializer_list does not copy the underlying objects.
     */

    ODIL_ELEMENT_CONSTRUCTORS(Integers);
    ODIL_ELEMENT_CONSTRUCTORS(Reals);
    ODIL_ELEMENT_CONSTRUCTORS(Strings);
    ODIL_ELEMENT_CONSTRUCTORS(DataSets);
    ODIL_ELEMENT_CONSTRUCTORS(Binary);
#undef ODIL_ELEMENT_CONSTRUCTORS

    Element(
        std::initializer_list<int> const & value, VR const & vr=VR::INVALID);

    Element(
        std::initializer_list<std::initializer_list<uint8_t>> const & value,
        VR const & vr=VR::INVALID);

    /** @addtogroup default_operations Default class operations
     * @{
     */
    ~Element() =default;
    Element(Element const &) =default;
    Element(Element &&) =default;
    Element & operator=(Element const &) =default;
    Element & operator=(Element &&) =default;
    /// @}

    /// @brief Test whether the element is empty.
    bool empty() const;

    /// @brief Return the number of items in the value.
    std::size_t size() const;

    /// @brief Return the raw value.
    Value const & get_value() const;

    /// @brief Test whether the value contains integers.
    bool is_int() const;

    /**
     * @brief Return the integers contained in the element.
     *
     * If the element does not contain integers, a odil::Exception is raised.
     */
    Value::Integers const & as_int() const;

    /**
     * @brief Return the integers contained in the element.
     *
     * If the element does not contain integers, a odil::Exception is raised.
     */
    Value::Integers & as_int();

    /// @brief Test whether the value contains reals.
    bool is_real() const;

    /**
     * @brief Return the reals contained in the element.
     *
     * If the element does not contain reals, a odil::Exception is raised.
     */
    Value::Reals const & as_real() const;

    /**
     * @brief Return the reals contained in the element.
     *
     * If the element does not contain reals, a odil::Exception is raised.
     */
    Value::Reals & as_real();

    /// @brief Test whether the value contains strings.
    bool is_string() const;

    /**
     * @brief Return the strings contained in the element.
     *
     * If the element does not contain strings, a odil::Exception is raised.
     */
    Value::Strings const & as_string() const;

    /**
     * @brief Return the strings contained in the element.
     *
     * If the element does not contain strings, a odil::Exception is raised.
     */
    Value::Strings & as_string();

    /// @brief Test whether the value contains data sets.
    bool is_data_set() const;

    /**
     * @brief Return the data sets contained in the element.
     *
     * If the element does not contain data sets, a odil::Exception is raised.
     */
    Value::DataSets const & as_data_set() const;

    /**
     * @brief Return the data sets contained in the element.
     *
     * If the element does not contain data sets, a odil::Exception is raised.
     */
    Value::DataSets & as_data_set();

    /// @brief Test whether the value contains data sets.
    bool is_binary() const;

    /**
     * @brief Return the binary data contained in the element.
     *
     * If the element does not contain binary data, a odil::Exception is raised.
     */
    Value::Binary const & as_binary() const;

    /**
     * @brief Return the binary data contained in the element.
     *
     * If the element does not contain binary data, a odil::Exception is raised.
     */
    Value::Binary & as_binary();

    /// @brief Equality test
    bool operator==(Element const & other) const;

    /// @brief Difference test
    bool operator!=(Element const & other) const;
    
    /// @brief Clear the element (element.empty() will be true).
    void clear();

private:
    Value _value;
};

/**
 * @brief Visitor of elements.
 */
template<typename TVisitor>
typename TVisitor::result_type
apply_visitor(TVisitor const & visitor, Element const & element);


}

#include "odil/Element.txx"

#endif // _9c3d8f32_0310_4e3a_b5d2_6d69f229a2cf