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#ifndef BERKELEYDBPROXY_DB_HXX_
#define BERKELEYDBPROXY_DB_HXX_

#ifdef SYSTEM_DB
#include <db.h>
#else
#include <berkeleydb/db.h>
#endif

#include "com/sun/star/ucb/XSimpleFileAccess.hpp"

#include <hash_map>
#include <rtl/string.hxx>

extern "C" { 
  typedef void *(*db_malloc_fcn_type)(size_t); 
  typedef void *(*db_realloc_fcn_type)(void *, size_t); 
  typedef void (*db_free_fcn_type)(void *); 
}


namespace berkeleydbproxy {

    class Dbc;
    class Dbt;

    namespace db_internal
    {
        class Noncopyable
        {
            // not implemented
            Noncopyable(const Noncopyable&);
            void operator=(const Noncopyable&);
        protected:
            Noncopyable() {}
            ~Noncopyable() {}
        };
    }
    
    class DbException 
    {
        rtl::OString what_;
    public:
        explicit DbException(rtl::OString const & whatparam) 
        : what_(whatparam)
        {}
        
        const char *what() const
        { return what_.getStr(); }
    };
  
    struct eq
    {
        bool operator()( const rtl::OString& rKey1, const rtl::OString& rKey2 ) const
            { return rKey1.compareTo( rKey2 ) == 0; }
    };

    struct ha
    {
        size_t operator()( const rtl::OString& rName ) const
            { return rName.hashCode(); }
    };


//#define TEST_DBHELP

    class DBData
    {
        friend class		DBHelp;

        int					m_nSize;
        char*				m_pBuffer;

        void copyToBuffer( const char* pSrcData, int nSize );

    public:
        DBData( void )
            : m_nSize( 0 )
            , m_pBuffer( NULL )
        {}
        ~DBData()
            { delete [] m_pBuffer; }

          int getSize() const
            { return m_nSize; }
          const char* getData() const
            { return m_pBuffer; }
    };

    typedef std::hash_map< rtl::OString,std::pair<int,int>,ha,eq >	StringToValPosMap;
    typedef std::hash_map< rtl::OString,rtl::OString,ha,eq >		StringToDataMap;

    class DBHelp
    {
        rtl::OUString		m_aFileName;
        StringToDataMap*	m_pStringToDataMap;
        StringToValPosMap*	m_pStringToValPosMap;
        com::sun::star::uno::Reference< com::sun::star::ucb::XSimpleFileAccess >
                            m_xSFA;

        com::sun::star::uno::Sequence< sal_Int8 >
                            m_aItData;
        const char*			m_pItData;
        int					m_nItRead;
        int					m_iItPos;

        bool implReadLenAndData( const char* pData, int& riPos, DBData& rValue );

    public:
        DBHelp( const rtl::OUString& rFileName,
            com::sun::star::uno::Reference< com::sun::star::ucb::XSimpleFileAccess > xSFA )
                : m_aFileName( rFileName )
                , m_pStringToDataMap( NULL )
                , m_pStringToValPosMap( NULL )
                , m_xSFA( xSFA )
                , m_pItData( NULL )
                , m_nItRead( -1 )
                , m_iItPos( -1 )
        {}
        ~DBHelp()
            { releaseHashMap(); }

        void createHashMap( bool bOptimizeForPerformance = false );
        void releaseHashMap( void );

#ifdef TEST_DBHELP
        bool testAgainstDb( const rtl::OString& fileName, bool bOldDbAccess );
#endif

        bool getValueForKey( const rtl::OString& rKey, DBData& rValue );

        bool startIteration( void );
        bool getNextKeyAndValue( DBData& rKey, DBData& rValue );
        void stopIteration( void );
    };

    class Db : db_internal::Noncopyable 
    {	
    private:	
        DB* m_pDBP;
        DBHelp* m_pDBHelp;
    
    public:
        Db();
        ~Db();

        void setDBHelp( DBHelp* pDBHelp )
            { m_pDBHelp = pDBHelp; }
        DBHelp* getDBHelp( void )
            { return m_pDBHelp; }

        int close(u_int32_t flags);

        int open(DB_TXN *txnid,
                 const char *file,
                 const char *database, 
                 DBTYPE type, 
                 u_int32_t flags, 
                 int mode);

    
        int get(DB_TXN* txnid, Dbt *key, Dbt *data, u_int32_t flags);
    
        int cursor(DB_TXN *txnid, Dbc **cursorp, u_int32_t flags);
    };
  
    class Dbc : db_internal::Noncopyable 
    {	
        friend class Db;
        friend class Dbt;

    private:	
        DBC* m_pDBC;
    
        explicit Dbc(DBC* pDBC);
        ~Dbc();
    
    public:
        int close();
    
        int get(Dbt *key, Dbt *data, u_int32_t flags);
    };
  
    class Dbt: private DBT 
    {	
        friend class Db;
        friend class Dbc;
    
    public:
        Dbt(void *data_arg, u_int32_t size_arg); 
    
        Dbt(); 
        //Dbt(const Dbt & other);
        //Dbt & operator=(const Dbt & other);
    
        ~Dbt();

          void *get_data() const;
        void set_data(void *value);
    
          u_int32_t get_size() const;
        void set_size(u_int32_t value);

        void set_flags(u_int32_t);
    };
}

#endif
















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