/src/gdal/ogr/ogrsf_frmts/ntf/ogrntffeatureclasslayer.cpp
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1 | | /****************************************************************************** |
2 | | * |
3 | | * Project: UK NTF Reader |
4 | | * Purpose: Implements OGRNTFFeatureClassLayer class. |
5 | | * Author: Frank Warmerdam, warmerdam@pobox.com |
6 | | * |
7 | | ****************************************************************************** |
8 | | * Copyright (c) 1999, Frank Warmerdam |
9 | | * |
10 | | * SPDX-License-Identifier: MIT |
11 | | ****************************************************************************/ |
12 | | |
13 | | #include "ntf.h" |
14 | | #include "cpl_conv.h" |
15 | | |
16 | | /************************************************************************/ |
17 | | /* OGRNTFFeatureClassLayer() */ |
18 | | /* */ |
19 | | /* Note that the OGRNTFLayer assumes ownership of the passed */ |
20 | | /* OGRFeatureDefn object. */ |
21 | | /************************************************************************/ |
22 | | |
23 | | OGRNTFFeatureClassLayer::OGRNTFFeatureClassLayer(OGRNTFDataSource *poDSIn) |
24 | 0 | : poFeatureDefn(new OGRFeatureDefn("FEATURE_CLASSES")), |
25 | 0 | poFilterGeom(nullptr), poDS(poDSIn), iCurrentFC(0) |
26 | 0 | { |
27 | | /* -------------------------------------------------------------------- */ |
28 | | /* Establish the schema. */ |
29 | | /* -------------------------------------------------------------------- */ |
30 | 0 | SetDescription(poFeatureDefn->GetName()); |
31 | 0 | poFeatureDefn->SetGeomType(wkbNone); |
32 | 0 | poFeatureDefn->Reference(); |
33 | |
|
34 | 0 | OGRFieldDefn oFCNum("FEAT_CODE", OFTString); |
35 | |
|
36 | 0 | oFCNum.SetWidth(4); |
37 | 0 | poFeatureDefn->AddFieldDefn(&oFCNum); |
38 | |
|
39 | 0 | OGRFieldDefn oFCName("FC_NAME", OFTString); |
40 | |
|
41 | 0 | oFCNum.SetWidth(80); |
42 | 0 | poFeatureDefn->AddFieldDefn(&oFCName); |
43 | 0 | } |
44 | | |
45 | | /************************************************************************/ |
46 | | /* ~OGRNTFFeatureClassLayer() */ |
47 | | /************************************************************************/ |
48 | | |
49 | | OGRNTFFeatureClassLayer::~OGRNTFFeatureClassLayer() |
50 | | |
51 | 0 | { |
52 | 0 | if (poFeatureDefn) |
53 | 0 | poFeatureDefn->Release(); |
54 | |
|
55 | 0 | if (poFilterGeom != nullptr) |
56 | 0 | delete poFilterGeom; |
57 | 0 | } |
58 | | |
59 | | /************************************************************************/ |
60 | | /* ResetReading() */ |
61 | | /************************************************************************/ |
62 | | |
63 | | void OGRNTFFeatureClassLayer::ResetReading() |
64 | | |
65 | 0 | { |
66 | 0 | iCurrentFC = 0; |
67 | 0 | } |
68 | | |
69 | | /************************************************************************/ |
70 | | /* GetNextFeature() */ |
71 | | /************************************************************************/ |
72 | | |
73 | | OGRFeature *OGRNTFFeatureClassLayer::GetNextFeature() |
74 | | |
75 | 0 | { |
76 | 0 | if (iCurrentFC >= GetFeatureCount()) |
77 | 0 | return nullptr; |
78 | | |
79 | 0 | return GetFeature((long)iCurrentFC++); |
80 | 0 | } |
81 | | |
82 | | /************************************************************************/ |
83 | | /* GetFeature() */ |
84 | | /************************************************************************/ |
85 | | |
86 | | OGRFeature *OGRNTFFeatureClassLayer::GetFeature(GIntBig nFeatureId) |
87 | | |
88 | 0 | { |
89 | 0 | char *pszFCName, *pszFCId; |
90 | |
|
91 | 0 | if (nFeatureId < 0 || nFeatureId >= poDS->GetFCCount()) |
92 | 0 | return nullptr; |
93 | | |
94 | 0 | poDS->GetFeatureClass((int)nFeatureId, &pszFCId, &pszFCName); |
95 | | |
96 | | /* -------------------------------------------------------------------- */ |
97 | | /* Create a corresponding feature. */ |
98 | | /* -------------------------------------------------------------------- */ |
99 | 0 | OGRFeature *poFeature = new OGRFeature(poFeatureDefn); |
100 | |
|
101 | 0 | poFeature->SetField(0, pszFCId); |
102 | 0 | poFeature->SetField(1, pszFCName); |
103 | 0 | poFeature->SetFID(nFeatureId); |
104 | |
|
105 | 0 | return poFeature; |
106 | 0 | } |
107 | | |
108 | | /************************************************************************/ |
109 | | /* GetFeatureCount() */ |
110 | | /* */ |
111 | | /* If a spatial filter is in effect, we turn control over to */ |
112 | | /* the generic counter. Otherwise we return the total count. */ |
113 | | /* Eventually we should consider implementing a more efficient */ |
114 | | /* way of counting features matching a spatial query. */ |
115 | | /************************************************************************/ |
116 | | |
117 | | GIntBig OGRNTFFeatureClassLayer::GetFeatureCount(CPL_UNUSED int bForce) |
118 | 0 | { |
119 | 0 | return poDS->GetFCCount(); |
120 | 0 | } |
121 | | |
122 | | /************************************************************************/ |
123 | | /* TestCapability() */ |
124 | | /************************************************************************/ |
125 | | |
126 | | int OGRNTFFeatureClassLayer::TestCapability(const char *pszCap) const |
127 | | |
128 | 0 | { |
129 | 0 | if (EQUAL(pszCap, OLCRandomRead)) |
130 | 0 | return TRUE; |
131 | | |
132 | 0 | else if (EQUAL(pszCap, OLCSequentialWrite) || EQUAL(pszCap, OLCRandomWrite)) |
133 | 0 | return FALSE; |
134 | | |
135 | 0 | else if (EQUAL(pszCap, OLCFastFeatureCount)) |
136 | 0 | return TRUE; |
137 | | |
138 | 0 | else if (EQUAL(pszCap, OLCFastSpatialFilter)) |
139 | 0 | return TRUE; |
140 | | |
141 | 0 | else |
142 | 0 | return FALSE; |
143 | 0 | } |