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/******************************************************************************
* $Id: ogr_gensql.h 24634 2012-07-01 14:39:00Z rouault $
*
* Project: OpenGIS Simple Features Reference Implementation
* Purpose: Classes related to generic implementation of ExecuteSQL().
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2002, Frank Warmerdam
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifndef _OGR_GENSQL_H_INCLUDED
#define _OGR_GENSQL_H_INCLUDED
#include "ogrsf_frmts.h"
#include "swq.h"
#include "cpl_hash_set.h"
/************************************************************************/
/* OGRGenSQLResultsLayer */
/************************************************************************/
class CPL_DLL OGRGenSQLResultsLayer : public OGRLayer
{
private:
OGRDataSource *poSrcDS;
OGRLayer *poSrcLayer;
void *pSelectInfo;
char *pszWHERE;
OGRLayer **papoTableLayers;
OGRFeatureDefn *poDefn;
int PrepareSummary();
int nIndexSize;
long *panFIDIndex;
int bOrderByValid;
int nNextIndexFID;
OGRFeature *poSummaryFeature;
int iFIDFieldIndex;
int nExtraDSCount;
OGRDataSource **papoExtraDS;
OGRFeature *TranslateFeature( OGRFeature * );
void CreateOrderByIndex();
void SortIndexSection( OGRField *pasIndexFields,
int nStart, int nEntries );
int Compare( OGRField *pasFirst, OGRField *pasSecond );
void ClearFilters();
void FindAndSetIgnoredFields();
void ExploreExprForIgnoredFields(swq_expr_node* expr, CPLHashSet* hSet);
void AddFieldDefnToSet(int iTable, int iColumn, CPLHashSet* hSet);
int ContainGeomSpecialField(swq_expr_node* expr);
void InvalidateOrderByIndex();
public:
OGRGenSQLResultsLayer( OGRDataSource *poSrcDS,
void *pSelectInfo,
OGRGeometry *poSpatFilter,
const char *pszWHERE,
const char *pszDialect );
virtual ~OGRGenSQLResultsLayer();
virtual OGRGeometry *GetSpatialFilter();
virtual void ResetReading();
virtual OGRFeature *GetNextFeature();
virtual OGRErr SetNextByIndex( long nIndex );
virtual OGRFeature *GetFeature( long nFID );
virtual OGRFeatureDefn *GetLayerDefn();
virtual OGRSpatialReference *GetSpatialRef();
virtual int GetFeatureCount( int bForce = TRUE );
virtual OGRErr GetExtent(OGREnvelope *psExtent, int bForce = TRUE);
virtual int TestCapability( const char * );
virtual void SetSpatialFilter( OGRGeometry * );
virtual OGRErr SetAttributeFilter( const char * );
};
#endif /* ndef _OGR_GENSQL_H_INCLUDED */
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