# ogr_gensql.h

    00001 /******************************************************************************
    00002  * $Id: ogr_gensql.h 20897 2010-10-19 19:15:58Z rouault $
    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 #ifndef _OGR_GENSQL_H_INCLUDED
    00031 #define _OGR_GENSQL_H_INCLUDED
    00032
    00033 #include "ogrsf_frmts.h"
    00034 #include "swq.h"
    00035 #include "cpl_hash_set.h"
    00036
    00037 /************************************************************************/
    00038 /*                        OGRGenSQLResultsLayer                         */
    00039 /************************************************************************/
    00040
    00041 class CPL_DLL OGRGenSQLResultsLayer : public OGRLayer
    00042 {
    00043   private:
    00044     OGRDataSource *poSrcDS;
    00045     OGRLayer    *poSrcLayer;
    00046     void        *pSelectInfo;
    00047
    00048     char        *pszWHERE;
    00049
    00050     OGRLayer   **papoTableLayers;
    00051
    00052     OGRFeatureDefn *poDefn;
    00053
    00054     int         PrepareSummary();
    00055
    00056     int         nIndexSize;
    00057     long       *panFIDIndex;
    00058
    00059     int         nNextIndexFID;
    00060     OGRFeature  *poSummaryFeature;
    00061
    00062     int         iFIDFieldIndex;
    00063
    00064     OGRField    *pasOrderByIndex;
    00065
    00066     int         nExtraDSCount;
    00067     OGRDataSource **papoExtraDS;
    00068
    00069     OGRFeature *TranslateFeature( OGRFeature * );
    00070     void        CreateOrderByIndex();
    00071     void        SortIndexSection( OGRField *pasIndexFields,
    00072                                   int nStart, int nEntries );
    00073     int         Compare( OGRField *pasFirst, OGRField *pasSecond );
    00074
    00075     void        ClearFilters();
    00076
    00077     void        SetIgnoredFields();
    00078     void        ExploreExprForIgnoredFields(swq_expr_node* expr, CPLHashSet* hSet);
    00079     void        AddFieldDefnToSet(int iTable, int iColumn, CPLHashSet* hSet);
    00080
    00081   public:
    00082                 OGRGenSQLResultsLayer( OGRDataSource *poSrcDS,
    00083                                        void *pSelectInfo,
    00084                                        OGRGeometry *poSpatFilter,
    00085                                        const char *pszWHERE );
    00086     virtual     ~OGRGenSQLResultsLayer();
    00087
    00088     virtual OGRGeometry *GetSpatialFilter();
    00089
    00090     virtual void        ResetReading();
    00091     virtual OGRFeature *GetNextFeature();
    00092     virtual OGRErr      SetNextByIndex( long nIndex );
    00093     virtual OGRFeature *GetFeature( long nFID );
    00094
    00095     virtual OGRFeatureDefn *GetLayerDefn();
    00096
    00097     virtual OGRSpatialReference *GetSpatialRef();
    00098
    00099     virtual int         GetFeatureCount( int bForce = TRUE );
    00100     virtual OGRErr      GetExtent(OGREnvelope *psExtent, int bForce = TRUE);
    00101
    00102     virtual int         TestCapability( const char * );
    00103 };
    00104
    00105 #endif /* ndef _OGR_GENSQL_H_INCLUDED */
    00106

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