iodir.h

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#ifndef iodir_H
#define iodir_H

/*+
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        A.H. Bril
 Date:          31-7-1995
 RCS:           $Id$
________________________________________________________________________

-*/


#include "generalmod.h"
#include "multiid.h"
#include "objectset.h"
#include "namedobj.h"
#include "od_iosfwd.h"
class IOObj;


/*\brief 'Directory' of IOObj objects.

The IODir class is responsible for finding all IOObj's in the system. An IODir
instance will actually load all IOObj's, provides access to keys and allows
searching. It has a key of its own.

Few operation are done through the IODir directly: usually, IOMan will be
the service access point.

*/


mExpClass(General) IODir : public NamedObject
{
public:
                        IODir(const char*);
                        IODir(const MultiID&);
                        ~IODir();
    void                reRead();
    bool                isBad() const           { return !isok_; }
    const MultiID&      key() const             { return key_; }

    const IOObj*        main() const;
    const char*         dirName() const         { return dirname_; }

    int                 size() const            { return objs_.size(); }
    int                 isEmpty() const         { return objs_.isEmpty(); }
    const IOObj*        get( int idx ) const    { return objs_[idx]; }
    const ObjectSet<IOObj>& getObjs() const     { return objs_; }

    bool                isPresent(const MultiID&) const;
    int                 indexOf(const MultiID&) const;
    const IOObj*        get(const MultiID&) const;
    const IOObj*        get(const char* nm,const char* trgrpnm=0) const;
                        // Without trgrpnm, just returns first

    bool                addObj(IOObj*,bool immediate_store=true);
    bool                commitChanges(const IOObj*);
    bool                permRemove(const MultiID&);
    bool                ensureUniqueName(IOObj&);

    static IOObj*       getObj(const MultiID&);
    static IOObj*       getMain(const char*);

                        // Use this if you know there's no contingency
                        // Therefore, only in special-purpose programs
    bool                doWrite() const;

private:

    ObjectSet<IOObj>    objs_;
    BufferString        dirname_;
    MultiID             key_;
    bool                isok_;
    mutable int         curid_;

                        IODir();
    static bool         create(const char* dirnm,const MultiID&,IOObj* mainobj);
    static IOObj*       doRead(const char*,IODir*,int id=-1);
    static void         setDirName(IOObj&,const char*);
    static IOObj*       readOmf(od_istream&,const char*,IODir*,int);

    bool                build();
    bool                wrOmf(od_ostream&) const;
    IOObj*              get( int idx )          { return objs_[idx]; }
    IOObj*              get(const MultiID&);

    MultiID             newKey() const;

    friend class        IOMan;
    friend class        IOObj;

};


#endif