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/* xbindex.cpp
Xbase64 project source code
This file contains the implementation of the xbIndex class.
Copyright (C) 1997,2003 Gary A Kunkel
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
*/
#ifdef __GNU LesserG__
#pragma implementation "xbindex.h"
#endif
#ifdef __WIN32__
#include <xbase64/xbwincfg.h>
#else
#include <xbase64/xbconfig.h>
#endif
#include <xbase64/xbase64.h>
#include <stdio.h>
#include <stdlib.h>
/*! \file xbindex.cpp
*/
#ifdef XB_INDEX_ANY
//! Constructor
/*!
\param pdbf
*/
xbIndex::xbIndex(xbDbf * pdbf)
{
index = this;
dbf = pdbf;
// ExpressionTree = NULL;
IxExp = NULL;
indexfp = NULL;
// IndexStatus = 0;
CurDbfRec = 0L;
KeyBuf = NULL;
KeyBuf2 = NULL;
#ifdef XB_LOCKING_ON
LockCnt = 0;
CurLockCount = 0;
CurLockType = -1;
#endif // XB_LOCKING_ON
}
/*************************************************************************/
//! Destructor
/*!
\param pdbf
*/
xbIndex::~xbIndex()
{
if( IxExp ){
delete IxExp;
IxExp = NULL;
}
}
/*************************************************************************/
void xbIndex::Flush()
{
if(indexfp) fflush(indexfp);
}
/*************************************************************************/
xbShort xbIndex::OpenIndex(const char* FileName)
{
if (IsOpen()) return XB_ALREADY_OPEN;
int rc;
SetFileName(FileName);
/* open the file */
if(( indexfp = fopen( GetFileName(), "r+b" )) == NULL ){
//
// Try to open read only if can't open read/write
//
if(( indexfp = fopen( GetFileName(), "rb" )) == NULL )
return XB_OPEN_ERROR;
}
#ifdef XB_LOCKING_ON
/*
** Must turn off buffering when multiple programs may be accessing
** index files.
*/
setbuf( indexfp, NULL );
#endif
// IndexStatus = 1;
if(( rc = GetHeadNode()) != 0){
fclose( indexfp );
return rc;
}
/* parse the expression */
/* pre 3.0
if(( rc = dbf->xbase->BuildExpressionTree( HeadNode.KeyExpression,
strlen( HeadNode.KeyExpression ), dbf )) != XB_NO_ERROR ){
return rc;
}
ExpressionTree = dbf->xbase->GetTree();
dbf->xbase->SetTreeToNull();
*/
IxExp = new xbExpn( dbf->xbase );
if(( rc = IxExp->BuildExpressionTree( GetKeyExpression(),
strlen( GetKeyExpression() ), dbf )) != XB_NO_ERROR ){
fclose( indexfp );
return rc;
}
rc=AllocKeyBufs();
if(rc){
#ifdef XB_LOCKING_ON
// if( dbf->GetAutoLock() )
// LockIndex( XB_UNLOCK );
#endif
fclose(indexfp);
return rc;
}
#ifdef XBASE_DEBUG
// CheckIndexIntegrity( 0 );
#endif
#ifdef XB_LOCKING_ON
//if( dbf->GetAutoLock() )
// LockIndex( XB_UNLOCK );
#endif
rc = dbf->AddIndexToIxList( index, GetFileName() );
return rc;
}
/*************************************************************************/
//! Short description.
/*!
*/
xbShort xbIndex::AllocKeyBufs()
{
KeyBuf = (char *) malloc( GetKeyLen() + 1 );
if(KeyBuf==NULL) {
return XB_NO_MEMORY;
};
KeyBuf2 = (char *) malloc( GetKeyLen() + 1);
if(KeyBuf2==NULL) {
free(KeyBuf);
return XB_NO_MEMORY;
};
memset( KeyBuf, 0x00, GetKeyLen() + 1 );
memset( KeyBuf2, 0x00, GetKeyLen() + 1 );
return XB_NO_ERROR;
}
/***********************************************************************/
xbShort xbIndex::CloseIndex( void )
{
if(KeyBuf){
free(KeyBuf);
KeyBuf = NULL;
}
if(KeyBuf2){
free(KeyBuf2);
KeyBuf2 = NULL;
}
dbf->RemoveIndexFromIxList( index ); // why not 'this'?
FreeNodesMemory();
if( IxExp ){
delete IxExp;
IxExp = 0;
}
if(indexfp){
fclose( indexfp );
indexfp = NULL;
}
// IndexStatus = 0;
return 0;
}
/***********************************************************************/
#endif // XB_INDEX_ANY
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