FeatureCollection.fromJson constructor Null safety
Creates a FeatureCollection from a JSON object.
Implementation
factory FeatureCollection.fromJson(Map<String, dynamic> json) {
if (json['type'] != 'FeatureCollection') {
throw ArgumentError('json is not a FeatureCollection');
}
return FeatureCollection(
(json['features'] as List<Map<String, dynamic>>)
.map((Map<String, dynamic> f) {
if (f['geometry']['type'] == 'Point') {
return Point.fromJson(f);
} else if (f['geometry']['type'] == 'MultiPoint') {
return MultiPoint.fromJson(f);
} else if (f['geometry']['type'] == 'LineString') {
return LineString.fromJson(f);
} else if (f['geometry']['type'] == 'MultiLineString') {
return MultiLineString.fromJson(f);
} else if (f['geometry']['type'] == 'Polygon') {
return Polygon.fromJson(f);
} else if (f['geometry']['type'] == 'MultiPolygon') {
return MultiPolygon.fromJson(f);
} else {
throw ArgumentError('json is not a feature');
}
}).toList(),
);
}