decode static method Null safety

BackgroundLayer decode(
  1. String properties
)

Implementation

static BackgroundLayer decode(String properties) {
  var map = json.decode(properties);
  if (map["layout"] == null) {
    map["layout"] = {};
  }
  if (map["paint"] == null) {
    map["paint"] = {};
  }
  return BackgroundLayer(
    id: map["id"],
    minZoom: map["minzoom"]?.toDouble(),
    maxZoom: map["maxzoom"]?.toDouble(),
    visibility: map["layout"]["visibility"] == null
        ? Visibility.VISIBLE
        : Visibility.values.firstWhere((e) => e
            .toString()
            .split('.')
            .last
            .toLowerCase()
            .contains(map["layout"]["visibility"])),
    backgroundColor: (map["paint"]["background-color"] as List?)?.toRGBAInt(),
    backgroundOpacity: map["paint"]["background-opacity"]?.toDouble(),
    backgroundPattern: map["paint"]["background-pattern"],
  );
}