/*  xbindex.h

    Xbase64 project source code

    This file contains a header file for the NTX object, which is used
    for handling NTX type indices. NTX are the Clipper equivalant of xbNdx
    files.

    Copyright (C) 1998  SynXis Corp., Bob Cotton

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


    Contact:
    
     Email:
    
      xdb-devel@lists.sourceforge.net
      xdb-users@lists.sourceforge.net
      
      
     Regular Mail:
     
       XBase Support
       149C South Main St
       Keller Texas, 76248     
       USA

*/

#ifndef __XB_INDEX_H__
#define __XB_INDEX_H__

#ifdef __GNU LesserG__
#pragma interface
#endif

#include <xbase64/xbase64.h>
#include <string.h>
/*! \file xbindex.h
*/

#define XB_UNIQUE     1
#define XB_NOT_UNIQUE 0

//! xbIndex class
/*!
*/

class XBDLLEXPORT xbIndex: protected xbFile
{
  public:
    xbIndex() {}
    xbIndex(xbDbf *);

    virtual ~xbIndex();

    xbShort  OpenIndex ( const char * );
    xbShort  CloseIndex();
    virtual xbShort  CreateIndex( const char *, const char *, xbShort, xbShort ) = 0;
    virtual xbLong   GetTotalNodes() = 0;
    virtual xbULong  GetCurDbfRec() = 0;
    virtual xbShort  CreateKey( xbShort, xbShort ) = 0;
    virtual xbShort  GetCurrentKey(char *key) = 0;
    virtual xbShort  AddKey( xbLong ) = 0;
    virtual xbShort  UniqueIndex() = 0;
    virtual xbShort  DeleteKey( xbLong ) = 0;
    virtual xbShort  KeyWasChanged() = 0;
    virtual xbShort  FindKey( const char * ) = 0;
    virtual xbShort  FindKey() = 0;
    virtual xbShort  FindKey( xbDouble ) = 0;
    virtual xbShort  GetNextKey() = 0;
    virtual xbShort  GetLastKey() = 0;
    virtual xbShort  GetFirstKey() = 0;
    virtual xbShort  GetPrevKey() = 0;
    virtual xbShort  ReIndex(void (*statusFunc)(xbLong itemNum, xbLong numItems) = 0) = 0;
//  virtual xbShort  KeyExists( char * Key ) { return FindKey( Key, strlen( Key ), 0 ); }
    virtual xbShort  KeyExists( xbDouble ) = 0;
    virtual xbShort  TouchIndex() { return XB_NO_ERROR; }
    virtual void     SetNodeSize(xbShort size) {}
    virtual xbShort  GetNodeSize() { return NodeSize; }
    virtual void     GetExpression(char *buf, int len) = 0;
    virtual void     Flush();
    virtual const char * GetIxName() {return GetFileName().getData();}
    xbShort AllocKeyBufs();
    xbBool IsOpen() {return indexfp!=NULL;}

#ifdef XBASE_DEBUG
    virtual void     DumpHdrNode( xbShort Option ) = 0;
    virtual void     DumpNodeRec( xbLong ) = 0;
    virtual void     DumpNodeChain() = 0;
    virtual xbShort  CheckIndexIntegrity( xbShort ) = 0;
#endif

#ifdef XB_LOCKING_ON
//     xbShort LockIndex( xbShort LockType );
//     virtual xbShort LockIndex( const xbShort, const xbShort );
#else
//     virtual xbShort  LockIndex( const xbShort, const xbShort ) const { return XB_NO_ERROR; }
#endif
  
  protected:
    virtual xbShort GetHeadNode()=0;
    virtual xbUShort GetKeyLen()=0;
    virtual const char* GetKeyExpression()=0;
    virtual void FreeNodesMemory()=0;

    xbIndex   *index;
    xbDbf     *dbf;
    xbExpn    *IxExp;                /* index expression defines keys */    
    FILE      *indexfp;
              /* NULL = closed, other = open   */
//    int       IndexStatus;         /* old - 0 = closed, 1 = open    */
    xbULong   CurDbfRec;             /* current Dbf record number     */
    char      *KeyBuf;               /* work area key buffer          */
    char      *KeyBuf2;              /* work area key buffer          */
    xbShort   NodeSize;

#ifdef XB_LOCKING_ON
    int LockCnt;                     /* current index lock count      */
    int CurLockCount;                /* old locking field             */
    int CurLockType;                 /* old locking field             */
#endif
};


#endif /* __XB_INDEX_H__ */