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/* xbfilter.cpp
Xbase project source code
This file conatains logic for the xbfilter 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 "xbfilter.h"
#endif
#ifdef __WIN32__
#include <xbase64/xbwincfg.h>
#else
#include <xbase64/xbconfig.h>
#endif
#include <xbase64/xbase64.h>
//#include <xbase64/xbexcept.h>
/*! \file xbfilter.cpp
*/
#ifdef XB_FILTERS
/************************************************************************/
//! Constructor.
/*!
\param dbf
\param index
\param exp
*/
xbFilter::xbFilter( xbDbf * dbf, xbIndex * index, char * exp )
{
xbShort rc;
Status = 0;
CurFilterRecNo = 0L;
d = dbf;
i = index;
// e = 0;
flExpn = new xbExpn( d->xbase );
if(( rc = flExpn->ParseExpression( exp, d )) != XB_NO_ERROR )
Status = rc;
else{
if( flExpn->GetExpressionResultType() != 'L' )
Status = XB_PARSE_ERROR;
}
}
/***********************************************************************/
//! Destructor.
/*!
*/
xbFilter::~xbFilter()
{
if( flExpn )
delete flExpn;
}
/***********************************************************************/
//! Short description.
/*!
*/
xbShort xbFilter::GetFirstFilterRec()
{
xbShort rc;
if( Status )
return Status;
if( i )
rc = i->GetFirstKey();
else
rc = d->GetFirstRecord();
while( rc == XB_NO_ERROR ){
if(( rc = flExpn->ProcessExpression()) != XB_NO_ERROR )
return rc;
if( flExpn->GetIntResult() )
{
CurFilterRecNo = d->GetCurRecNo();
return XB_NO_ERROR;
}
if( i )
rc = i->GetNextKey();
else
rc = d->GetNextRecord();
}
return rc;
}
/***********************************************************************/
//! Short description.
/*!
*/
xbShort xbFilter::GetLastFilterRec()
{
xbShort rc;
if( Status )
return Status;
if( i )
rc = i->GetLastKey();
else
rc = d->GetLastRecord();
while( rc == XB_NO_ERROR ){
if(( rc = flExpn->ProcessExpression()) != XB_NO_ERROR )
return rc;
if( flExpn->GetIntResult() )
{
CurFilterRecNo = d->GetCurRecNo();
return XB_NO_ERROR;
}
if( i )
rc = i->GetPrevKey();
else
rc = d->GetPrevRecord();
}
return rc;
}
/***********************************************************************/
//! Short description.
/*!
*/
xbShort xbFilter::GetNextFilterRec()
{
xbShort rc;
if( Status )
return Status;
if( !CurFilterRecNo )
return GetFirstFilterRec();
if( i ){
rc = i->GetNextKey();
}
else
rc = d->GetNextRecord();
while( rc == XB_NO_ERROR ){
if(( rc = flExpn->ProcessExpression()) != XB_NO_ERROR )
return rc;
if( flExpn->GetIntResult())
{
CurFilterRecNo = d->GetCurRecNo();
return XB_NO_ERROR;
}
if( i )
rc = i->GetNextKey();
else
rc = d->GetNextRecord();
}
return rc;
}
/***********************************************************************/
//! Short description.
/*!
*/
xbShort xbFilter::GetPrevFilterRec()
{
xbShort rc;
if( Status )
return Status;
if( !CurFilterRecNo )
return GetLastFilterRec();
if( i ){
rc = i->GetPrevKey();
}
else
rc = d->GetPrevRecord();
while( rc == XB_NO_ERROR ){
if(( rc = flExpn->ProcessExpression()) != XB_NO_ERROR )
return rc;
if( flExpn->GetIntResult())
{
CurFilterRecNo = d->GetCurRecNo();
return XB_NO_ERROR;
}
if( i )
rc = i->GetPrevKey();
else
rc = d->GetPrevRecord();
}
return rc;
}
/***********************************************************************/
#endif // XB_FILTERS_ON
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