ogr_gensql.h

00001 /******************************************************************************
00002  * $Id: ogr_gensql.h,v 1.7 2005/02/02 20:00:29 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 1.7  2005/02/02 20:00:29  fwarmerdam
00032  * added SetNextByIndex support
00033  *
00034  * Revision 1.6  2003/03/20 19:13:21  warmerda
00035  * Added ClearFilters() method to cleanup spatial or attribute filters on the
00036  * target layer, and any joined layers.  Used in destructor and after all
00037  * features have been read from source layer.
00038  *
00039  * Revision 1.5  2003/03/19 20:34:23  warmerda
00040  * add support for tables from external datasources
00041  *
00042  * Revision 1.4  2003/03/05 05:10:17  warmerda
00043  * implement join support
00044  *
00045  * Revision 1.3  2002/04/29 19:35:50  warmerda
00046  * fixes for selecting FID
00047  *
00048  * Revision 1.2  2002/04/25 16:07:55  warmerda
00049  * fleshed out DISTINCT support
00050  *
00051  * Revision 1.1  2002/04/25 02:24:37  warmerda
00052  * New
00053  *
00054  */
00055 
00056 #ifndef _OGR_GENSQL_H_INCLUDED
00057 #define _OGR_GENSQL_H_INCLUDED
00058 
00059 #include "ogrsf_frmts.h"
00060 
00061 /************************************************************************/
00062 /*                        OGRGenSQLResultsLayer                         */
00063 /************************************************************************/
00064 
00065 class CPL_DLL OGRGenSQLResultsLayer : public OGRLayer
00066 {
00067   private:
00068     OGRDataSource *poSrcDS;
00069     OGRLayer    *poSrcLayer;
00070     void        *pSelectInfo;
00071 
00072     OGRLayer   **papoTableLayers;
00073 
00074     OGRGeometry *poSpatialFilter;
00075 
00076     OGRFeatureDefn *poDefn;
00077 
00078     int         PrepareSummary();
00079 
00080     int         nIndexSize;
00081     long       *panFIDIndex;
00082 
00083     int         nNextIndexFID;
00084     OGRFeature  *poSummaryFeature;
00085 
00086     int         iFIDFieldIndex;
00087 
00088     OGRField    *pasOrderByIndex;
00089 
00090     int         nExtraDSCount;
00091     OGRDataSource **papoExtraDS;
00092 
00093     OGRFeature *TranslateFeature( OGRFeature * );
00094     void        CreateOrderByIndex();
00095     void        SortIndexSection( OGRField *pasIndexFields, 
00096                                   int nStart, int nEntries );
00097     int         Compare( OGRField *pasFirst, OGRField *pasSecond );
00098 
00099     void        ClearFilters();
00100     
00101   public:
00102                 OGRGenSQLResultsLayer( OGRDataSource *poSrcDS, 
00103                                        void *pSelectInfo, 
00104                                        OGRGeometry *poSpatFilter );
00105     virtual     ~OGRGenSQLResultsLayer();
00106 
00107     virtual OGRGeometry *GetSpatialFilter();
00108     virtual void        SetSpatialFilter( OGRGeometry * );
00109 
00110 #ifdef notdef
00111     virtual OGRErr      SetAttributeFilter( const char * );
00112 #endif
00113 
00114     virtual void        ResetReading();
00115     virtual OGRFeature *GetNextFeature();
00116     virtual OGRErr      SetNextByIndex( long nIndex );
00117     virtual OGRFeature *GetFeature( long nFID );
00118 
00119     virtual OGRFeatureDefn *GetLayerDefn();
00120 
00121     virtual OGRSpatialReference *GetSpatialRef();
00122 
00123     virtual int         GetFeatureCount( int bForce = TRUE );
00124     virtual OGRErr      GetExtent(OGREnvelope *psExtent, int bForce = TRUE);
00125 
00126     virtual int         TestCapability( const char * );
00127 };
00128 
00129 #endif /* ndef _OGR_GENSQL_H_INCLUDED */
00130 

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