GDAL
ogr_gensql.h
1 /******************************************************************************
2  * $Id$
3  *
4  * Project: OpenGIS Simple Features Reference Implementation
5  * Purpose: Classes related to generic implementation of ExecuteSQL().
6  * Author: Frank Warmerdam, warmerdam@pobox.com
7  *
8  ******************************************************************************
9  * Copyright (c) 2002, Frank Warmerdam
10  * Copyright (c) 2010-2013, Even Rouault <even dot rouault at mines-paris dot org>
11  *
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17  * Software is furnished to do so, subject to the following conditions:
18  *
19  * The above copyright notice and this permission notice shall be included
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23  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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30 
31 #ifndef OGR_GENSQL_H_INCLUDED
32 #define OGR_GENSQL_H_INCLUDED
33 
34 #include "ogrsf_frmts.h"
35 #include "swq.h"
36 #include "cpl_hash_set.h"
37 #include "cpl_string.h"
38 
39 #include <vector>
40 
43 #define GEOM_FIELD_INDEX_TO_ALL_FIELD_INDEX(poFDefn, iGeom) \
44  ((poFDefn)->GetFieldCount() + SPECIAL_FIELD_COUNT + (iGeom))
45 
46 #define IS_GEOM_FIELD_INDEX(poFDefn, idx) \
47  (((idx) >= (poFDefn)->GetFieldCount() + SPECIAL_FIELD_COUNT) && \
48  ((idx) < (poFDefn)->GetFieldCount() + SPECIAL_FIELD_COUNT + (poFDefn)->GetGeomFieldCount()))
49 
50 #define ALL_FIELD_INDEX_TO_GEOM_FIELD_INDEX(poFDefn, idx) \
51  ((idx) - ((poFDefn)->GetFieldCount() + SPECIAL_FIELD_COUNT))
52 
53 /************************************************************************/
54 /* OGRGenSQLResultsLayer */
55 /************************************************************************/
56 
57 class OGRGenSQLResultsLayer final: public OGRLayer
58 {
59  private:
60  GDALDataset *poSrcDS;
61  OGRLayer *poSrcLayer;
62  void *pSelectInfo;
63 
64  char *pszWHERE;
65 
66  OGRLayer **papoTableLayers;
67 
68  OGRFeatureDefn *poDefn;
69 
70  int *panGeomFieldToSrcGeomField;
71 
72  size_t nIndexSize;
73  GIntBig *panFIDIndex;
74  int bOrderByValid;
75 
76  GIntBig nNextIndexFID;
77  OGRFeature *poSummaryFeature;
78 
79  int iFIDFieldIndex;
80 
81  int nExtraDSCount;
82  GDALDataset **papoExtraDS;
83 
84  GIntBig nIteratedFeatures;
85  std::vector<CPLString> m_oDistinctList;
86 
87  int PrepareSummary();
88 
89  OGRFeature *TranslateFeature( OGRFeature * );
90  void CreateOrderByIndex();
91  void ReadIndexFields( OGRFeature* poSrcFeat,
92  int nOrderItems,
93  OGRField *pasIndexFields );
94  void SortIndexSection( const OGRField *pasIndexFields,
95  GIntBig *panMerged,
96  size_t nStart, size_t nEntries );
97  void FreeIndexFields(OGRField *pasIndexFields,
98  size_t l_nIndexSize,
99  bool bFreeArray = true);
100  int Compare( const OGRField *pasFirst, const OGRField *pasSecond );
101 
102  void ClearFilters();
103  void ApplyFiltersToSource();
104 
105  void FindAndSetIgnoredFields();
106  void ExploreExprForIgnoredFields(swq_expr_node* expr, CPLHashSet* hSet);
107  void AddFieldDefnToSet(int iTable, int iColumn, CPLHashSet* hSet);
108 
109  int ContainGeomSpecialField(swq_expr_node* expr);
110 
111  void InvalidateOrderByIndex();
112 
113  int MustEvaluateSpatialFilterOnGenSQL();
114 
115  CPL_DISALLOW_COPY_ASSIGN(OGRGenSQLResultsLayer)
116 
117  public:
118  OGRGenSQLResultsLayer( GDALDataset *poSrcDS,
119  void *pSelectInfo,
120  OGRGeometry *poSpatFilter,
121  const char *pszWHERE,
122  const char *pszDialect );
123  virtual ~OGRGenSQLResultsLayer();
124 
125  virtual OGRGeometry *GetSpatialFilter() override;
126 
127  virtual void ResetReading() override;
128  virtual OGRFeature *GetNextFeature() override;
129  virtual OGRErr SetNextByIndex( GIntBig nIndex ) override;
130  virtual OGRFeature *GetFeature( GIntBig nFID ) override;
131 
132  virtual OGRFeatureDefn *GetLayerDefn() override;
133 
134  virtual GIntBig GetFeatureCount( int bForce = TRUE ) override;
135  virtual OGRErr GetExtent(OGREnvelope *psExtent, int bForce = TRUE) override { return GetExtent(0, psExtent, bForce); }
136  virtual OGRErr GetExtent(int iGeomField, OGREnvelope *psExtent, int bForce = TRUE) override;
137 
138  virtual int TestCapability( const char * ) override;
139 
140  virtual void SetSpatialFilter( OGRGeometry * poGeom ) override { SetSpatialFilter(0, poGeom); }
141  virtual void SetSpatialFilter( int iGeomField, OGRGeometry * ) override;
142  virtual OGRErr SetAttributeFilter( const char * ) override;
143 };
144 
147 #endif /* ndef OGR_GENSQL_H_INCLUDED */
virtual OGRErr SetAttributeFilter(const char *)
Set a new attribute query.
Definition: ogrlayer.cpp:338
virtual void SetSpatialFilter(OGRGeometry *)
Set a new spatial filter.
Definition: ogrlayer.cpp:1113
Hash set implementation.
Definition of a feature class or feature layer.
Definition: ogr_feature.h:259
Various convenience functions for working with strings and string lists.
Abstract base class for all geometry classes.
Definition: ogr_geometry.h:286
Classes related to registration of format support, and opening datasets.
virtual int TestCapability(const char *)=0
Test if this layer supported the named capability.
OGRFeature field attribute value union.
Definition: ogr_core.h:679
This class represents a layer of simple features, with access methods.
Definition: ogrsf_frmts.h:70
virtual OGRErr GetExtent(OGREnvelope *psExtent, int bForce=TRUE) CPL_WARN_UNUSED_RESULT
Fetch the extent of this layer.
Definition: ogrlayer.cpp:211
A simple feature, including geometry and attributes.
Definition: ogr_feature.h:353
A set of associated raster bands, usually from one file.
Definition: gdal_priv.h:335
long long GIntBig
Large signed integer type (generally 64-bit integer type).
Definition: cpl_port.h:246
int OGRErr
Simple container for a bounding region.
Definition: ogr_core.h:290
struct _CPLHashSet CPLHashSet
Opaque type for a hash set.
Definition: cpl_hash_set.h:52
#define CPL_DISALLOW_COPY_ASSIGN(ClassName)
Helper to remove the copy and assignment constructors so that the compiler will not generate the defa...
Definition: cpl_port.h:987

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