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#ifndef INCLUDED_CONNECTIVITY_DBCHARSET_HXX
#define INCLUDED_CONNECTIVITY_DBCHARSET_HXX

#include <sal/config.h>

#include <cstddef>
#include <set>

#include <rtl/textenc.h>
#include <rtl/tencinfo.h>
#include <rtl/ustring.hxx>
#include <connectivity/dbtoolsdllapi.hxx>


namespace dbtools
{



    //= OCharsetMap

    /** is a class which translates between different charset representations.

        <p>The set of recognized charsets is very limited: only the ones which are database relevant are
        implemented at the moment</p>

        <p>Possible representations are:
        <ul>
            <li><b>IANA names.</b>
            Have a look at <A href="http://www.iana.org/assignments/character-sets">this document</A> for
            more details</li>
            <li><b>rtl_TextEncoding</b></li>
        </ul>
        </p>
    */
    class OOO_DLLPUBLIC_DBTOOLS OCharsetMap
    {
    protected:
        typedef std::set<rtl_TextEncoding> TextEncBag;

        TextEncBag  m_aEncodings;

    public:
        class CharsetIterator;
        friend class OCharsetMap::CharsetIterator;
        typedef CharsetIterator iterator;
        typedef CharsetIterator const_iterator;

        OCharsetMap();
        virtual ~OCharsetMap();

        struct IANA { };

        /** find the given text encoding in the map.
            @return the <em>end</em> iterator if the encoding could not be found.
        */
        CharsetIterator find(const rtl_TextEncoding _eEncoding) const;
        /** find the given IANA name in the map.
            @return the <em>end</em> iterator if the IANA name could not be found.
        */
        CharsetIterator find(const OUString& _rIanaName, const IANA&) const;

        std::size_t   size() const { ensureConstructed( ); return m_aEncodings.size(); }

        /// get access to the first element of the charset collection
        CharsetIterator begin() const;
        /// get access to the (last + 1st) element of the charset collection
        CharsetIterator end() const;

    protected:
        // needed because we want to call a virtual method during construction
                void lateConstruct();
        inline  void ensureConstructed( ) const { if ( m_aEncodings.empty() ) const_cast< OCharsetMap* >( this )->lateConstruct(); }

        virtual bool approveEncoding( const rtl_TextEncoding _eEncoding, const rtl_TextEncodingInfo& _rInfo ) const;
    };


    //- CharsetIteratorDerefHelper

    class OOO_DLLPUBLIC_DBTOOLS CharsetIteratorDerefHelper
    {
        friend class OCharsetMap::CharsetIterator;

        rtl_TextEncoding    m_eEncoding;
        OUString     m_aIanaName;

    public:
        CharsetIteratorDerefHelper(const CharsetIteratorDerefHelper& _rSource);

        rtl_TextEncoding    getEncoding() const { return m_eEncoding; }
        OUString     getIanaName() const { return m_aIanaName; }

    protected:
        CharsetIteratorDerefHelper( const rtl_TextEncoding _eEncoding, const OUString& _rIanaName );

    };



    //- OCharsetMap::CharsetIterator

    class OOO_DLLPUBLIC_DBTOOLS OCharsetMap::CharsetIterator
    {
        friend class OCharsetMap;

        friend OOO_DLLPUBLIC_DBTOOLS bool operator==(const CharsetIterator& lhs, const CharsetIterator& rhs);
        friend bool operator!=(const CharsetIterator& lhs, const CharsetIterator& rhs) { return !(lhs == rhs); }

//      friend sal_Int32 operator-(const CharsetIterator& lhs, const CharsetIterator& rhs);

    protected:
        const OCharsetMap*                      m_pContainer;
        OCharsetMap::TextEncBag::const_iterator m_aPos;

    public:
        CharsetIterator(const CharsetIterator& _rSource);
        ~CharsetIterator();

        CharsetIteratorDerefHelper operator*() const;
        // no -> operator
        // this would require us to a) store CharsetIteratorDerefHelper instances ourself so that we
        // can return a pointer or b) introduce a -> operator on the CharsetIteratorDerefHelper, too.

        /// prefix increment
        const CharsetIterator&  operator++();
        /// postfix increment
        const CharsetIterator   operator++(int) { CharsetIterator hold(*this); ++*this; return hold; }

        /// prefix decrement
        const CharsetIterator&  operator--();
        /// postfix decrement
        const CharsetIterator   operator--(int) { CharsetIterator hold(*this); --*this; return hold; }

    protected:
        CharsetIterator(const OCharsetMap* _pContainer, OCharsetMap::TextEncBag::const_iterator _aPos );
    };


}   // namespace dbtools


#endif // INCLUDED_CONNECTIVITY_DBCHARSET_HXX

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