Datum.h

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/*
 * Copyright (c) 2005 Palmsource, Inc.
 * 
 * This software is licensed as described in the file LICENSE, which
 * you should have received as part of this distribution. The terms
 * are also available at http://www.openbinder.org/license.html.
 * 
 * This software consists of voluntary contributions made by many
 * individuals. For the exact contribution history, see the revision
 * history and logs, available at http://www.openbinder.org
 */

#ifndef _SUPPORT_DATUM_H
#define _SUPPORT_DATUM_H

#include <support/IDatum.h>
#include <support/IByteStream.h>

#if _SUPPORTS_NAMESPACE
namespace palmos {
namespace support {
#endif



class SDatum
{
public:
    // --------------------------------------------------------------

                        SDatum();

                        SDatum(const SValue& value);
                        SDatum(const sptr<IBinder>& binder);
                        SDatum(const sptr<IDatum>& datum);
                        SDatum(const SDatum& datum);
                        ~SDatum();

    SDatum&             operator=(const SDatum& o);

    bool                operator<(const SDatum& o) const;
    bool                operator<=(const SDatum& o) const;
    bool                operator==(const SDatum& o) const;
    bool                operator!=(const SDatum& o) const;
    bool                operator>=(const SDatum& o) const;
    bool                operator>(const SDatum& o) const;

    status_t            StatusCheck() const;

    sptr<IDatum>        Datum() const;



    // --------------------------------------------------------------


    SValue              FetchValue(size_t maxSize, status_t* outError = NULL) const;


    SValue              FetchTruncatedValue(size_t maxSize, status_t* outError = NULL) const;


    sptr<IByteInput>    OpenInput(  uint32_t mode = IDatum::READ_ONLY,
                                    status_t* outError = NULL) const;


    sptr<IByteOutput>   OpenOutput( uint32_t mode = IDatum::READ_WRITE | IDatum::ERASE_DATUM,
                                    status_t* outError = NULL);


    sptr<IByteOutput>   OpenOutput( uint32_t mode,
                                    const sptr<IBinder>& editor,
                                    uint32_t newType,
                                    status_t* outError = NULL);


private:
    SValue              do_fetch_value(size_t maxSize, status_t* outError, bool truncate) const;

    SValue              m_value;
    sptr<IDatum>        m_datum;
};

#if _SUPPORTS_NAMESPACE
} } // namespace palmos::support
#endif

#endif // _SUPPORT_DATUM_H

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