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/* $Id: xbfilter.cpp
Xbase project source code
This file conatains a header file for the xbStack object which
is used for handling expressions.
Copyright (C) 1997 Startech, Gary A. Kunkel
This library 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 2.1 of the License, or (at your option) any later version.
This library 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 library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Mail:
Technology Associates, Inc.
XBase Project
1455 Deming Way #11
Sparks, NV 89434
USA
Email:
xbase@techass.com
See our website at:
xdb.sourceforge.net
V 1.0 10/10/97 - Initial release of software
V 1.5 1/2/97 - Added memo field support
V 1.6a 4/1/98 - Added expression support
V 1.6b 4/8/98 - Numeric index keys
V 1.8.x 3/29/99 - Initial support for filters added
*/
#ifdef __GNUG__
#pragma implementation "xbfilter.h"
#endif
#ifdef __WIN32__
#include <xbase/xbconfigw32.h>
#else
#include <xbase/xbconfig.h>
#endif
#include <xbase/xbase.h>
#include <xbase/xbexcept.h>
/*! \file xbfilter.cpp
*/
#ifdef XB_FILTERS
/************************************************************************/
//! Short description.
/*!
\param dbf
\param index
\param exp
*/
xbFilter::xbFilter( xbDbf * dbf, xbIndex * index, char * exp )
{
xbShort rc;
Status = 0;
CurFilterRecNo = 0L;
d = dbf;
i = index;
if(( rc = d->xbase->ParseExpression( exp, d )) != XB_NO_ERROR )
Status = rc;
else{
e = d->xbase->GetExpressionHandle();
if( d->xbase->GetExpressionResultType( e ) != 'L' )
Status = XB_PARSE_ERROR;
}
}
/***********************************************************************/
//! 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 = d->xbase->ProcessExpression( e )) != XB_NO_ERROR )
xb_error( rc );
std::cout << "xbfilter fixme" << std::endl;
// if( d->xbase->GetInt()){
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->GetPrevRecord();
while( rc == XB_NO_ERROR ){
if(( rc = d->xbase->ProcessExpression( e )) != XB_NO_ERROR )
xb_error( rc );
std::cout << "xbfilter fixme" << std::endl;
// if( d->xbase->GetInt()){
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 = d->xbase->ProcessExpression( e )) != XB_NO_ERROR )
xb_error( rc );
std::cout << "xbfilter fix me" << std::endl;
// if( d->xbase->GetInt()){
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 = d->xbase->ProcessExpression( e )) != XB_NO_ERROR )
xb_error( rc );
std::cout << "xbfilter fix me" << std::endl;
// if( d->xbase->GetInt()){
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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