OGR
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00001 /****************************************************************************** 00002 * $Id: ogr_gensql.h 10645 2007-01-18 02:22:39Z warmerdam $ 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 00035 /************************************************************************/ 00036 /* OGRGenSQLResultsLayer */ 00037 /************************************************************************/ 00038 00039 class CPL_DLL OGRGenSQLResultsLayer : public OGRLayer 00040 { 00041 private: 00042 OGRDataSource *poSrcDS; 00043 OGRLayer *poSrcLayer; 00044 void *pSelectInfo; 00045 00046 OGRLayer **papoTableLayers; 00047 00048 OGRFeatureDefn *poDefn; 00049 00050 int PrepareSummary(); 00051 00052 int nIndexSize; 00053 long *panFIDIndex; 00054 00055 int nNextIndexFID; 00056 OGRFeature *poSummaryFeature; 00057 00058 int iFIDFieldIndex; 00059 00060 OGRField *pasOrderByIndex; 00061 00062 int nExtraDSCount; 00063 OGRDataSource **papoExtraDS; 00064 00065 OGRFeature *TranslateFeature( OGRFeature * ); 00066 void CreateOrderByIndex(); 00067 void SortIndexSection( OGRField *pasIndexFields, 00068 int nStart, int nEntries ); 00069 int Compare( OGRField *pasFirst, OGRField *pasSecond ); 00070 00071 void ClearFilters(); 00072 00073 public: 00074 OGRGenSQLResultsLayer( OGRDataSource *poSrcDS, 00075 void *pSelectInfo, 00076 OGRGeometry *poSpatFilter ); 00077 virtual ~OGRGenSQLResultsLayer(); 00078 00079 virtual OGRGeometry *GetSpatialFilter(); 00080 00081 virtual void ResetReading(); 00082 virtual OGRFeature *GetNextFeature(); 00083 virtual OGRErr SetNextByIndex( long nIndex ); 00084 virtual OGRFeature *GetFeature( long nFID ); 00085 00086 virtual OGRFeatureDefn *GetLayerDefn(); 00087 00088 virtual OGRSpatialReference *GetSpatialRef(); 00089 00090 virtual int GetFeatureCount( int bForce = TRUE ); 00091 virtual OGRErr GetExtent(OGREnvelope *psExtent, int bForce = TRUE); 00092 00093 virtual int TestCapability( const char * ); 00094 }; 00095 00096 #endif /* ndef _OGR_GENSQL_H_INCLUDED */ 00097