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# ogr_gensql.h

    00001 /******************************************************************************
    00002  * $Id: ogr_gensql.h,v 1.8 2006/04/08 06:14:31 fwarmerdam Exp $
    00003  *
    00004  * Project:  OpenGIS Simple Features Reference Implementation
    00005  * Purpose:  Classes related to generic implementation of ExecuteSQL().
    00006  * Author:   Frank Warmerdam, warmerdam@pobox.com
    00007  *
    00008  ******************************************************************************
    00009  * Copyright (c) 2002, Frank Warmerdam
    00010  *
    00011  * Permission is hereby granted, free of charge, to any person obtaining a
    00012  * copy of this software and associated documentation files (the "Software"),
    00013  * to deal in the Software without restriction, including without limitation
    00014  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    00015  * and/or sell copies of the Software, and to permit persons to whom the
    00016  * Software is furnished to do so, subject to the following conditions:
    00017  *
    00018  * The above copyright notice and this permission notice shall be included
    00019  * in all copies or substantial portions of the Software.
    00020  *
    00021  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    00022  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00023  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    00024  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00025  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    00026  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    00027  * DEALINGS IN THE SOFTWARE.
    00028  ******************************************************************************
    00029  *
    00030  * $Log: ogr_gensql.h,v $
    00031  * Revision 1.8  2006/04/08 06:14:31  fwarmerdam
    00032  * added proper (I believe) support for spatial and attribute filter on gensql layers
    00033  *
    00034  * Revision 1.7  2005/02/02 20:00:29  fwarmerdam
    00035  * added SetNextByIndex support
    00036  *
    00037  * Revision 1.6  2003/03/20 19:13:21  warmerda
    00038  * Added ClearFilters() method to cleanup spatial or attribute filters on the
    00039  * target layer, and any joined layers.  Used in destructor and after all
    00040  * features have been read from source layer.
    00041  *
    00042  * Revision 1.5  2003/03/19 20:34:23  warmerda
    00043  * add support for tables from external datasources
    00044  *
    00045  * Revision 1.4  2003/03/05 05:10:17  warmerda
    00046  * implement join support
    00047  *
    00048  * Revision 1.3  2002/04/29 19:35:50  warmerda
    00049  * fixes for selecting FID
    00050  *
    00051  * Revision 1.2  2002/04/25 16:07:55  warmerda
    00052  * fleshed out DISTINCT support
    00053  *
    00054  * Revision 1.1  2002/04/25 02:24:37  warmerda
    00055  * New
    00056  *
    00057  */
    00058
    00059 #ifndef _OGR_GENSQL_H_INCLUDED
    00060 #define _OGR_GENSQL_H_INCLUDED
    00061
    00062 #include "ogrsf_frmts.h"
    00063
    00064 /************************************************************************/
    00065 /*                        OGRGenSQLResultsLayer                         */
    00066 /************************************************************************/
    00067
    00068 class CPL_DLL OGRGenSQLResultsLayer : public OGRLayer
    00069 {
    00070   private:
    00071     OGRDataSource *poSrcDS;
    00072     OGRLayer    *poSrcLayer;
    00073     void        *pSelectInfo;
    00074
    00075     OGRLayer   **papoTableLayers;
    00076
    00077     OGRFeatureDefn *poDefn;
    00078
    00079     int         PrepareSummary();
    00080
    00081     int         nIndexSize;
    00082     long       *panFIDIndex;
    00083
    00084     int         nNextIndexFID;
    00085     OGRFeature  *poSummaryFeature;
    00086
    00087     int         iFIDFieldIndex;
    00088
    00089     OGRField    *pasOrderByIndex;
    00090
    00091     int         nExtraDSCount;
    00092     OGRDataSource **papoExtraDS;
    00093
    00094     OGRFeature *TranslateFeature( OGRFeature * );
    00095     void        CreateOrderByIndex();
    00096     void        SortIndexSection( OGRField *pasIndexFields,
    00097                                   int nStart, int nEntries );
    00098     int         Compare( OGRField *pasFirst, OGRField *pasSecond );
    00099
    00100     void        ClearFilters();
    00101
    00102   public:
    00103                 OGRGenSQLResultsLayer( OGRDataSource *poSrcDS,
    00104                                        void *pSelectInfo,
    00105                                        OGRGeometry *poSpatFilter );
    00106     virtual     ~OGRGenSQLResultsLayer();
    00107
    00108     virtual OGRGeometry *GetSpatialFilter();
    00109
    00110     virtual void        ResetReading();
    00111     virtual OGRFeature *GetNextFeature();
    00112     virtual OGRErr      SetNextByIndex( long nIndex );
    00113     virtual OGRFeature *GetFeature( long nFID );
    00114
    00115     virtual OGRFeatureDefn *GetLayerDefn();
    00116
    00117     virtual OGRSpatialReference *GetSpatialRef();
    00118
    00119     virtual int         GetFeatureCount( int bForce = TRUE );
    00120     virtual OGRErr      GetExtent(OGREnvelope *psExtent, int bForce = TRUE);
    00121
    00122     virtual int         TestCapability( const char * );
    00123 };
    00124
    00125 #endif /* ndef _OGR_GENSQL_H_INCLUDED */
    00126

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