read1Poi method

PointOfInterest read1Poi(Readbuffer readBuffer, double tileLatitude, double tileLongitude, MapDatastore mapDataStore, List<Tag> poiTags,)

Reads a single Point of Interest (POI) from the given readBuffer.

Implementation

PointOfInterest read1Poi(Readbuffer readBuffer, double tileLatitude, double tileLongitude, MapDatastore mapDataStore, List<Tag> poiTags) {
  if (_mapFileHeader.getMapHeaderInfo().debugFile) {
    // get and check the POI signature
    String signaturePoi = readBuffer.readUTF8EncodedString2(SIGNATURE_LENGTH_POI);
    if (!signaturePoi.startsWith("***POIStart")) {
      throw MapFileException("invalid POI signature: $signaturePoi");
    }
  }

  // get the POI latitude offset (VBE-S)
  double latitude = tileLatitude + LatLongUtils.microdegreesToDegrees(readBuffer.readSignedInt());

  // get the POI longitude offset (VBE-S)
  double longitude = tileLongitude + LatLongUtils.microdegreesToDegrees(readBuffer.readSignedInt());

  // get the special int which encodes multiple flags
  int specialByte = readBuffer.readByte();

  // bit 1-4 represent the layer
  int layer = ((specialByte & POI_LAYER_BITMASK) >> POI_LAYER_SHIFT);
  // bit 5-8 represent the number of tag IDs
  int numberOfTags = (specialByte & POI_NUMBER_OF_TAGS_BITMASK);

  // get the tags from IDs (VBE-U)
  List<Tag> tags = readBuffer.readTags(poiTags, numberOfTags);

  // get the feature bitmask (1 byte)
  int featureByte = readBuffer.readByte();

  // bit 1-3 enable optional features
  bool featureName = (featureByte & POI_FEATURE_NAME) != 0;
  bool featureHouseNumber = (featureByte & POI_FEATURE_HOUSE_NUMBER) != 0;
  bool featureElevation = (featureByte & POI_FEATURE_ELEVATION) != 0;

  // check if the POI has a name
  if (featureName) {
    tags.add(Tag(TAG_KEY_NAME, mapDataStore.extractLocalized(readBuffer.readUTF8EncodedString())!));
  }

  // check if the POI has a house number
  if (featureHouseNumber) {
    tags.add(Tag(TAG_KEY_HOUSE_NUMBER, readBuffer.readUTF8EncodedString()));
  }

  // check if the POI has an elevation
  if (featureElevation) {
    tags.add(Tag(TAG_KEY_ELE, readBuffer.readSignedInt().toString()));
  }

  LatLong position = LatLong(latitude, longitude);
  return PointOfInterest(layer, TagCollection(tags: tags), position);
}