safefileio.h

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#pragma once
 
/*+
________________________________________________________________________
 
 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        A.H. Bril
 Date:          Nov 2004
 RCS:           $Id$
________________________________________________________________________
 
-*/
 
#include "basicmod.h"
#include "od_iostream.h"
 
 
mExpClass(Basic) SafeFileIO
{
public:
 
                        SafeFileIO(const char*,bool locked=false);
                        ~SafeFileIO();
 
    bool                open(bool forread,bool ignorelock=false);
    const char*         errMsg() const          { return errmsg_.str(); }
    od_istream&         istrm();
    od_ostream&         ostrm();
 
    void                closeFail( bool keeplock=false )
                        { doClose( keeplock, false ); }
    bool                closeSuccess( bool keeplock=false )
                        { return doClose( keeplock, true ); }
 
    const char*         fileName() const        { return filenm_.buf(); }
 
    // Some setup variables
    bool                usebakwhenmissing_;     
    bool                removebakonsuccess_;    
    int                 lockretries_;           
    double              lockwaitincr_;          
    bool                allowlockremove_;       
 
    bool                remove();
 
protected:
 
    const bool          locked_;
    const BufferString  filenm_;
    const BufferString  lockfnm_;
    const BufferString  bakfnm_;
    const BufferString  newfnm_;
    mutable BufferString errmsg_;
    od_stream*          strm_;
 
    bool                openRead(bool);
    bool                openWrite(bool);
    bool                commitWrite();
    bool                doClose(bool, bool);
 
    bool                haveLock() const;
    bool                waitForLock() const;
    void                mkLock(bool);
    void                rmLock();
};