/****************************************************************************** * $Id: ogr_gensql.h 10646 2007-01-18 02:38:10Z warmerdam $ * * 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"/************************************************************************//*                        OGRGenSQLResultsLayer                         *//************************************************************************/class CPL_DLL OGRGenSQLResultsLayer : public OGRLayer{  private:    OGRDataSource *poSrcDS;    OGRLayer    *poSrcLayer;    void        *pSelectInfo;    OGRLayer   **papoTableLayers;    OGRFeatureDefn *poDefn;    int         PrepareSummary();    int         nIndexSize;    long       *panFIDIndex;    int         nNextIndexFID;    OGRFeature  *poSummaryFeature;    int         iFIDFieldIndex;    OGRField    *pasOrderByIndex;    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();      public:                OGRGenSQLResultsLayer( OGRDataSource *poSrcDS,                                        void *pSelectInfo,                                        OGRGeometry *poSpatFilter );    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 * );};#endif /* ndef _OGR_GENSQL_H_INCLUDED */