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ogrunionlayer.h
1 /******************************************************************************
2 * $Id$
3 *
4 * Project: OpenGIS Simple Features Reference Implementation
5 * Purpose: Defines OGRUnionLayer class
6 * Author: Even Rouault, even dot rouault at mines dash paris dot org
7 *
8 ******************************************************************************
9 * Copyright (c) 2012-2014, Even Rouault <even dot rouault at mines-paris dot org>
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice shall be included
19 * in all copies or substantial portions of the Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 * DEALINGS IN THE SOFTWARE.
28 ****************************************************************************/
29
30 #ifndef OGRUNIONLAYER_H_INCLUDED
31 #define OGRUNIONLAYER_H_INCLUDED
32
33 #ifndef DOXYGEN_SKIP
34
35 #include "ogrsf_frmts.h"
36
37 /************************************************************************/
38 /* OGRUnionLayerGeomFieldDefn */
39 /************************************************************************/
40
41 class OGRUnionLayerGeomFieldDefn: public OGRGeomFieldDefn
42 {
43 public:
44
45 int bGeomTypeSet;
46 int bSRSSet;
47 OGREnvelope sStaticEnvelope;
48
49 OGRUnionLayerGeomFieldDefn(const char* pszName, OGRwkbGeometryType eType);
50 explicit OGRUnionLayerGeomFieldDefn(OGRGeomFieldDefn* poSrc);
51 explicit OGRUnionLayerGeomFieldDefn(OGRUnionLayerGeomFieldDefn* poSrc);
52 ~OGRUnionLayerGeomFieldDefn();
53 };
54
55 /************************************************************************/
56 /* OGRUnionLayer */
57 /************************************************************************/
58
59 typedef enum
60 {
61 FIELD_FROM_FIRST_LAYER,
62 FIELD_UNION_ALL_LAYERS,
63 FIELD_INTERSECTION_ALL_LAYERS,
64 FIELD_SPECIFIED,
65 } FieldUnionStrategy;
66
67 class OGRUnionLayer : public OGRLayer
68 {
69 protected:
70 CPLString osName;
71 int nSrcLayers;
72 OGRLayer **papoSrcLayers;
73 int bHasLayerOwnership;
74
75 OGRFeatureDefn *poFeatureDefn;
76 int nFields;
77 OGRFieldDefn **papoFields;
78 int nGeomFields;
79 OGRUnionLayerGeomFieldDefn **papoGeomFields;
80 FieldUnionStrategy eFieldStrategy;
81 CPLString osSourceLayerFieldName;
82
83 int bPreserveSrcFID;
84
85 GIntBig nFeatureCount;
86
87 int iCurLayer;
88 char *pszAttributeFilter;
89 int nNextFID;
90 int *panMap;
91 char **papszIgnoredFields;
92 int bAttrFilterPassThroughValue;
93 int *pabModifiedLayers;
94 int *pabCheckIfAutoWrap;
95 OGRSpatialReference *poGlobalSRS;
96
97 void AutoWarpLayerIfNecessary(int iSubLayer);
98 OGRFeature *TranslateFromSrcLayer(OGRFeature* poSrcFeature);
99 void ApplyAttributeFilterToSrcLayer(int iSubLayer);
100 int GetAttrFilterPassThroughValue();
101 void ConfigureActiveLayer();
102 void SetSpatialFilterToSourceLayer(OGRLayer* poSrcLayer);
103
104 public:
105 OGRUnionLayer( const char* pszName,
106 int nSrcLayers, /* must be >= 1 */
107 OGRLayer** papoSrcLayers, /* array itself ownership always transferred, layer ownership depending on bTakeLayerOwnership */
108 int bTakeLayerOwnership);
109
110 virtual ~OGRUnionLayer();
111
112 /* All the following non virtual methods must be called just after the constructor */
113 /* and before any virtual method */
114 void SetFields(FieldUnionStrategy eFieldStrategy,
115 int nFields,
116 OGRFieldDefn** papoFields, /* duplicated by the method */
117 int nGeomFields, /* maybe -1 to explicitly disable geometry fields */
118 OGRUnionLayerGeomFieldDefn** papoGeomFields /* duplicated by the method */);
119 void SetSourceLayerFieldName(const char* pszSourceLayerFieldName);
120 void SetPreserveSrcFID(int bPreserveSrcFID);
121 void SetFeatureCount(int nFeatureCount);
122 virtual const char *GetName() override { return osName.c_str(); }
123 virtual OGRwkbGeometryType GetGeomType() override;
124
125 virtual void ResetReading() override;
126 virtual OGRFeature *GetNextFeature() override;
127
128 virtual OGRFeature *GetFeature( GIntBig nFeatureId ) override;
129
130 virtual OGRErr ICreateFeature( OGRFeature* poFeature ) override;
131
132 virtual OGRErr ISetFeature( OGRFeature* poFeature ) override;
133
134 virtual OGRFeatureDefn *GetLayerDefn() override;
135
136 virtual OGRSpatialReference *GetSpatialRef() override;
137
138 virtual GIntBig GetFeatureCount( int ) override;
139
140 virtual OGRErr SetAttributeFilter( const char * ) override;
141
142 virtual int TestCapability( const char * ) override;
143
144 virtual OGRErr GetExtent(int iGeomField, OGREnvelope *psExtent, int bForce = TRUE) override;
145 virtual OGRErr GetExtent( OGREnvelope *psExtent, int bForce ) override;
146
147 virtual void SetSpatialFilter( OGRGeometry * poGeomIn ) override;
148 virtual void SetSpatialFilter( int iGeomField, OGRGeometry * ) override;
149
150 virtual OGRErr SetIgnoredFields( const char **papszFields ) override;
151
152 virtual OGRErr SyncToDisk() override;
153 };
154
155 #endif /* #ifndef DOXYGEN_SKIP */
156
157 #endif // OGRUNIONLAYER_H_INCLUDED
OGRLayer::ISetFeature
virtual OGRErr ISetFeature(OGRFeature *poFeature) CPL_WARN_UNUSED_RESULT
Rewrite an existing feature.
Definition: ogrlayer.cpp:597
OGRLayer::GetLayerDefn
virtual OGRFeatureDefn * GetLayerDefn()=0
Fetch the schema information for this layer.
OGRLayer::SetAttributeFilter
virtual OGRErr SetAttributeFilter(const char *)
Set a new attribute query.
Definition: ogrlayer.cpp:337
OGRLayer::ICreateFeature
virtual OGRErr ICreateFeature(OGRFeature *poFeature) CPL_WARN_UNUSED_RESULT
Create and write a new feature within a layer.
Definition: ogrlayer.cpp:636
OGRLayer::SetSpatialFilter
virtual void SetSpatialFilter(OGRGeometry *)
Set a new spatial filter.
Definition: ogrlayer.cpp:1112
OGRGeomFieldDefn
Definition of a geometry field of an OGRFeatureDefn.
Definition: ogr_feature.h:182
OGRLayer::SetIgnoredFields
virtual OGRErr SetIgnoredFields(const char **papszFields)
Set which fields can be omitted when retrieving features from the layer.
Definition: ogrlayer.cpp:1791
OGRLayer::GetName
virtual const char * GetName()
Return the layer name.
Definition: ogrlayer.cpp:1727
CPLString
Convenient string class based on std::string.
Definition: cpl_string.h:336
OGRFeatureDefn
Definition of a feature class or feature layer.
Definition: ogr_feature.h:259
OGRLayer::GetFeature
virtual OGRFeature * GetFeature(GIntBig nFID) CPL_WARN_UNUSED_RESULT
Fetch a feature by its identifier.
Definition: ogrlayer.cpp:446
OGRFieldDefn
Definition of an attribute of an OGRFeatureDefn.
Definition: ogr_feature.h:92
OGRwkbGeometryType
OGRwkbGeometryType
List of well known binary geometry types.
Definition: ogr_core.h:317
OGRLayer::GetFeatureCount
virtual GIntBig GetFeatureCount(int bForce=TRUE)
Fetch the feature count in this layer.
Definition: ogrlayer.cpp:172
OGRGeometry
Abstract base class for all geometry classes.
Definition: ogr_geometry.h:286
ogrsf_frmts.h
Classes related to registration of format support, and opening datasets.
OGRLayer::TestCapability
virtual int TestCapability(const char *)=0
Test if this layer supported the named capability.
OGRLayer::ResetReading
virtual void ResetReading()=0
Reset feature reading to start on the first feature.
OGRSpatialReference
This class represents an OpenGIS Spatial Reference System, and contains methods for converting betwee...
Definition: ogr_spatialref.h:145
OGRLayer::SyncToDisk
virtual OGRErr SyncToDisk()
Flush pending changes to disk.
Definition: ogrlayer.cpp:1519
OGRLayer
This class represents a layer of simple features, with access methods.
Definition: ogrsf_frmts.h:70
OGRLayer::GetExtent
virtual OGRErr GetExtent(OGREnvelope *psExtent, int bForce=TRUE) CPL_WARN_UNUSED_RESULT
Fetch the extent of this layer.
Definition: ogrlayer.cpp:210
OGRFeature
A simple feature, including geometry and attributes.
Definition: ogr_feature.h:353
OGRLayer::GetNextFeature
virtual OGRFeature * GetNextFeature() CPL_WARN_UNUSED_RESULT=0
Fetch the next available feature from this layer.
GIntBig
long long GIntBig
Large signed integer type (generally 64-bit integer type).
Definition: cpl_port.h:246
OGRLayer::GetSpatialRef
virtual OGRSpatialReference * GetSpatialRef()
Fetch the spatial reference system for this layer.
Definition: ogrlayer.cpp:1036
OGRErr
int OGRErr
Simple container for a bounding region.
Definition: ogr_core.h:290
OGRLayer::GetGeomType
virtual OGRwkbGeometryType GetGeomType()
Return the layer geometry type.
Definition: ogrlayer.cpp:1754

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