OGR
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00001 /****************************************************************************** 00002 * $Id: ogr_gensql.h 24634 2012-07-01 14:39:00Z 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 int bOrderByValid; 00059 00060 int nNextIndexFID; 00061 OGRFeature *poSummaryFeature; 00062 00063 int iFIDFieldIndex; 00064 00065 int nExtraDSCount; 00066 OGRDataSource **papoExtraDS; 00067 00068 OGRFeature *TranslateFeature( OGRFeature * ); 00069 void CreateOrderByIndex(); 00070 void SortIndexSection( OGRField *pasIndexFields, 00071 int nStart, int nEntries ); 00072 int Compare( OGRField *pasFirst, OGRField *pasSecond ); 00073 00074 void ClearFilters(); 00075 00076 void FindAndSetIgnoredFields(); 00077 void ExploreExprForIgnoredFields(swq_expr_node* expr, CPLHashSet* hSet); 00078 void AddFieldDefnToSet(int iTable, int iColumn, CPLHashSet* hSet); 00079 00080 int ContainGeomSpecialField(swq_expr_node* expr); 00081 00082 void InvalidateOrderByIndex(); 00083 00084 public: 00085 OGRGenSQLResultsLayer( OGRDataSource *poSrcDS, 00086 void *pSelectInfo, 00087 OGRGeometry *poSpatFilter, 00088 const char *pszWHERE, 00089 const char *pszDialect ); 00090 virtual ~OGRGenSQLResultsLayer(); 00091 00092 virtual OGRGeometry *GetSpatialFilter(); 00093 00094 virtual void ResetReading(); 00095 virtual OGRFeature *GetNextFeature(); 00096 virtual OGRErr SetNextByIndex( long nIndex ); 00097 virtual OGRFeature *GetFeature( long nFID ); 00098 00099 virtual OGRFeatureDefn *GetLayerDefn(); 00100 00101 virtual OGRSpatialReference *GetSpatialRef(); 00102 00103 virtual int GetFeatureCount( int bForce = TRUE ); 00104 virtual OGRErr GetExtent(OGREnvelope *psExtent, int bForce = TRUE); 00105 00106 virtual int TestCapability( const char * ); 00107 00108 virtual void SetSpatialFilter( OGRGeometry * ); 00109 virtual OGRErr SetAttributeFilter( const char * ); 00110 }; 00111 00112 #endif /* ndef _OGR_GENSQL_H_INCLUDED */ 00113