-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
qgsjsonutils.cpp
401 lines (365 loc) · 12.5 KB
/
qgsjsonutils.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
/***************************************************************************
qgsjsonutils.h
-------------
Date : May 206
Copyright : (C) 2016 Nyall Dawson
Email : nyall dot dawson at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsjsonutils.h"
#include "qgsfeatureiterator.h"
#include "qgsogrutils.h"
#include "qgsgeometry.h"
#include "qgsvectorlayer.h"
#include "qgsrelation.h"
#include "qgsrelationmanager.h"
#include "qgsproject.h"
#include "qgsexception.h"
#include "qgslogger.h"
#include "qgsfieldformatterregistry.h"
#include "qgsfieldformatter.h"
#include "qgsapplication.h"
#include "nlohmann/json.hpp"
#include <QJsonDocument>
#include <QJsonArray>
QgsJsonExporter::QgsJsonExporter( QgsVectorLayer *vectorLayer, int precision )
: mPrecision( precision )
, mLayer( vectorLayer )
{
if ( vectorLayer )
{
mCrs = vectorLayer->crs();
mTransform.setSourceCrs( mCrs );
}
mTransform.setDestinationCrs( QgsCoordinateReferenceSystem( 4326, QgsCoordinateReferenceSystem::EpsgCrsId ) );
}
void QgsJsonExporter::setVectorLayer( QgsVectorLayer *vectorLayer )
{
mLayer = vectorLayer;
if ( vectorLayer )
{
mCrs = vectorLayer->crs();
mTransform.setSourceCrs( mCrs );
}
}
QgsVectorLayer *QgsJsonExporter::vectorLayer() const
{
return mLayer.data();
}
void QgsJsonExporter::setSourceCrs( const QgsCoordinateReferenceSystem &crs )
{
mCrs = crs;
mTransform.setSourceCrs( mCrs );
}
QgsCoordinateReferenceSystem QgsJsonExporter::sourceCrs() const
{
return mCrs;
}
QString QgsJsonExporter::exportFeature( const QgsFeature &feature, const QVariantMap &extraProperties,
const QVariant &id, int indent ) const
{
return QString::fromStdString( exportFeatureToJsonObject( feature, extraProperties, id ).dump( indent ) );
}
json QgsJsonExporter::exportFeatureToJsonObject( const QgsFeature &feature, const QVariantMap &extraProperties, const QVariant &id ) const
{
json featureJson
{
{ "type", "Feature" },
};
if ( id.isValid() )
{
bool ok = false;
auto intId = id.toLongLong( &ok );
if ( ok )
{
featureJson["id"] = intId;
}
else
{
featureJson["id"] = id.toString().toStdString();
}
}
else
{
featureJson["id"] = feature.id();
}
QgsGeometry geom = feature.geometry();
if ( !geom.isNull() && mIncludeGeometry )
{
if ( mCrs.isValid() )
{
try
{
QgsGeometry transformed = geom;
if ( transformed.transform( mTransform ) == 0 )
geom = transformed;
}
catch ( QgsCsException &cse )
{
Q_UNUSED( cse );
}
}
QgsRectangle box = geom.boundingBox();
if ( QgsWkbTypes::flatType( geom.wkbType() ) != QgsWkbTypes::Point )
{
featureJson[ "bbox" ] = { {
box.xMinimum(),
box.yMinimum(),
box.xMaximum(),
box.yMaximum()
}
};
}
featureJson[ "geometry" ] = geom.asJsonObject( mPrecision );
}
else
{
featureJson[ "geometry" ] = nullptr;
}
// build up properties element
int attributeCounter { 0 };
json properties;
if ( mIncludeAttributes || !extraProperties.isEmpty() )
{
//read all attribute values from the feature
if ( mIncludeAttributes )
{
QgsFields fields = mLayer ? mLayer->fields() : feature.fields();
// List of formatters through we want to pass the values
QStringList formattersWhiteList;
formattersWhiteList << QStringLiteral( "KeyValue" )
<< QStringLiteral( "List" )
<< QStringLiteral( "ValueRelation" )
<< QStringLiteral( "ValueMap" );
for ( int i = 0; i < fields.count(); ++i )
{
if ( ( !mAttributeIndexes.isEmpty() && !mAttributeIndexes.contains( i ) ) || mExcludedAttributeIndexes.contains( i ) )
continue;
QVariant val = feature.attributes().at( i );
if ( mLayer )
{
const QgsEditorWidgetSetup setup = fields.at( i ).editorWidgetSetup();
const QgsFieldFormatter *fieldFormatter = QgsApplication::fieldFormatterRegistry()->fieldFormatter( setup.type() );
if ( formattersWhiteList.contains( fieldFormatter->id() ) )
val = fieldFormatter->representValue( mLayer.data(), i, setup.config(), QVariant(), val );
}
QString name = fields.at( i ).name();
if ( mAttributeDisplayName )
{
name = mLayer->attributeDisplayName( i );
}
properties[ name.toStdString() ] = QgsJsonUtils::jsonFromVariant( val );
attributeCounter++;
}
}
if ( !extraProperties.isEmpty() )
{
QVariantMap::const_iterator it = extraProperties.constBegin();
for ( ; it != extraProperties.constEnd(); ++it )
{
properties[ it.key().toStdString() ] = QgsJsonUtils::jsonFromVariant( it.value() );
attributeCounter++;
}
}
// related attributes
if ( mLayer && mIncludeRelatedAttributes )
{
QList< QgsRelation > relations = QgsProject::instance()->relationManager()->referencedRelations( mLayer.data() );
for ( const auto &relation : qgis::as_const( relations ) )
{
QgsFeatureRequest req = relation.getRelatedFeaturesRequest( feature );
req.setFlags( QgsFeatureRequest::NoGeometry );
QgsVectorLayer *childLayer = relation.referencingLayer();
json relatedFeatureAttributes;
if ( childLayer )
{
QgsFeatureIterator it = childLayer->getFeatures( req );
QVector<QVariant> attributeWidgetCaches;
int fieldIndex = 0;
const QgsFields fields { childLayer->fields() };
for ( const QgsField &field : fields )
{
QgsEditorWidgetSetup setup = field.editorWidgetSetup();
QgsFieldFormatter *fieldFormatter = QgsApplication::fieldFormatterRegistry()->fieldFormatter( setup.type() );
attributeWidgetCaches.append( fieldFormatter->createCache( childLayer, fieldIndex, setup.config() ) );
fieldIndex++;
}
QgsFeature relatedFet;
while ( it.nextFeature( relatedFet ) )
{
relatedFeatureAttributes += QgsJsonUtils::exportAttributesToJsonObject( relatedFet, childLayer, attributeWidgetCaches );
}
}
properties[ relation.name().toStdString() ] = relatedFeatureAttributes;
attributeCounter++;
}
}
}
featureJson[ "properties" ] = properties;
return featureJson;
}
QString QgsJsonExporter::exportFeatures( const QgsFeatureList &features, int indent ) const
{
json data
{
{ "type", "FeatureCollection" },
{ "features", json::array() }
};
const auto constFeatures = features;
for ( const QgsFeature &feature : constFeatures )
{
data["features"].push_back( exportFeatureToJsonObject( feature ) );
}
return QString::fromStdString( data.dump( indent ) );
}
//
// QgsJsonUtils
//
QgsFeatureList QgsJsonUtils::stringToFeatureList( const QString &string, const QgsFields &fields, QTextCodec *encoding )
{
return QgsOgrUtils::stringToFeatureList( string, fields, encoding );
}
QgsFields QgsJsonUtils::stringToFields( const QString &string, QTextCodec *encoding )
{
return QgsOgrUtils::stringToFields( string, encoding );
}
QString QgsJsonUtils::encodeValue( const QVariant &value )
{
if ( value.isNull() )
return QStringLiteral( "null" );
switch ( value.type() )
{
case QVariant::Int:
case QVariant::UInt:
case QVariant::LongLong:
case QVariant::ULongLong:
case QVariant::Double:
return value.toString();
case QVariant::Bool:
return value.toBool() ? "true" : "false";
case QVariant::StringList:
case QVariant::List:
case QVariant::Map:
return QString::fromUtf8( QJsonDocument::fromVariant( value ).toJson( QJsonDocument::Compact ) );
default:
case QVariant::String:
QString v = value.toString()
.replace( '\\', QLatin1String( "\\\\" ) )
.replace( '"', QLatin1String( "\\\"" ) )
.replace( '\r', QLatin1String( "\\r" ) )
.replace( '\b', QLatin1String( "\\b" ) )
.replace( '\t', QLatin1String( "\\t" ) )
.replace( '/', QLatin1String( "\\/" ) )
.replace( '\n', QLatin1String( "\\n" ) );
return v.prepend( '"' ).append( '"' );
}
}
QString QgsJsonUtils::exportAttributes( const QgsFeature &feature, QgsVectorLayer *layer, const QVector<QVariant> &attributeWidgetCaches )
{
QgsFields fields = feature.fields();
QString attrs;
for ( int i = 0; i < fields.count(); ++i )
{
if ( i > 0 )
attrs += QLatin1String( ",\n" );
QVariant val = feature.attributes().at( i );
if ( layer )
{
QgsEditorWidgetSetup setup = layer->fields().at( i ).editorWidgetSetup();
QgsFieldFormatter *fieldFormatter = QgsApplication::fieldFormatterRegistry()->fieldFormatter( setup.type() );
if ( fieldFormatter != QgsApplication::fieldFormatterRegistry()->fallbackFieldFormatter() )
val = fieldFormatter->representValue( layer, i, setup.config(), attributeWidgetCaches.count() >= i ? attributeWidgetCaches.at( i ) : QVariant(), val );
}
attrs += encodeValue( fields.at( i ).name() ) + ':' + encodeValue( val );
}
return attrs.prepend( '{' ).append( '}' );
}
QVariantList QgsJsonUtils::parseArray( const QString &json, QVariant::Type type )
{
QJsonParseError error;
const QJsonDocument jsonDoc = QJsonDocument::fromJson( json.toUtf8(), &error );
QVariantList result;
if ( error.error != QJsonParseError::NoError )
{
QgsLogger::warning( QStringLiteral( "Cannot parse json (%1): %2" ).arg( error.errorString(), json ) );
return result;
}
if ( !jsonDoc.isArray() )
{
QgsLogger::warning( QStringLiteral( "Cannot parse json (%1) as array: %2" ).arg( error.errorString(), json ) );
return result;
}
const auto constArray = jsonDoc.array();
for ( const QJsonValue &cur : constArray )
{
QVariant curVariant = cur.toVariant();
if ( curVariant.convert( type ) )
result.append( curVariant );
else
QgsLogger::warning( QStringLiteral( "Cannot convert json array element: %1" ).arg( cur.toString() ) );
}
return result;
}
json QgsJsonUtils::jsonFromVariant( const QVariant &val )
{
if ( val.type() == QVariant::Type::Map )
{
const auto vMap { val.toMap() };
auto jMap { json::object() };
for ( auto it = vMap.constBegin(); it != vMap.constEnd(); it++ )
{
jMap[ it.key().toStdString() ] = jsonFromVariant( it.value() );
}
return jMap;
}
else if ( val.type() == QVariant::Type::List )
{
const auto vList{ val.toList() };
auto jList { json::array() };
for ( const auto &v : vList )
{
jList.push_back( jsonFromVariant( v ) );
}
return jList;
}
else
{
switch ( val.userType() )
{
case QMetaType::Int:
case QMetaType::UInt:
case QMetaType::LongLong:
case QMetaType::ULongLong:
return val.toLongLong();
case QMetaType::Double:
case QMetaType::Float:
return val.toDouble();
default:
return val.toString().toStdString();
}
}
}
json QgsJsonUtils::exportAttributesToJsonObject( const QgsFeature &feature, QgsVectorLayer *layer, const QVector<QVariant> &attributeWidgetCaches )
{
QgsFields fields = feature.fields();
json attrs;
for ( int i = 0; i < fields.count(); ++i )
{
QVariant val = feature.attributes().at( i );
if ( layer )
{
QgsEditorWidgetSetup setup = layer->fields().at( i ).editorWidgetSetup();
QgsFieldFormatter *fieldFormatter = QgsApplication::fieldFormatterRegistry()->fieldFormatter( setup.type() );
if ( fieldFormatter != QgsApplication::fieldFormatterRegistry()->fallbackFieldFormatter() )
val = fieldFormatter->representValue( layer, i, setup.config(), attributeWidgetCaches.count() >= i ? attributeWidgetCaches.at( i ) : QVariant(), val );
}
attrs[fields.at( i ).name().toStdString()] = jsonFromVariant( val );
}
return attrs;
}