Class TileIdentifier

  • Direct Known Subclasses:
    BingTileIdentifier, OSMTileIdentifier

    public abstract class TileIdentifier
    extends Object
    A TileIdentifier locates a tile in the grid space of a given tile server by giving its column, row and zoom level. The main responsibility of a TileIdentifier is to translate the grid values (zoom, x, y) into a "code" using an algorithm which denotes the tile in a given server implementation.

    For example, OpenStreetMap identifies the tile by z/x/y.png; Bing Maps uses a quad key representation.
    This class formerly known as "WMTTileName".

    Tobias Sauerwein, Ugo Taddei
    • Constructor Detail

      • TileIdentifier

        public TileIdentifier​(int x,
                              int y,
                              ZoomLevel zoomLevel,
                              String serviceName)
    • Method Detail

      • getZ

        public int getZ()
        Gets the zoom level (aka "level of detail").

        Most tile services offer zoom level in the range between 0 (whole world) to 22 (street level). The exact range depends on the service implementation

        the zoom level
      • getX

        public int getX()
        Gets the column value of a tile.
      • getY

        public int getY()
        Gets the row value of a tile.
      • getZoomLevel

        public ZoomLevel getZoomLevel()
        Gets the row value of a tile.
      • getServiceName

        public String getServiceName()
      • arithmeticMod

        public static final int arithmeticMod​(int a,
                                              int b)
        Arithmetic implementation of modulo, as the Java implementation of modulo can return negative values.
         arithmeticMod(-1, 8) = 7
        the positive remainder
      • hashCode

        public int hashCode()
        hashCode in class Object
      • getId

        public abstract String getId()
        Gets the id of a tile, which can be used for caching purposes.

        The id is a file-friendly name (that is, should contains no special characters such as ".", "/", etc. The id should be build from the code (which also uniquely identifies a tile, but, in some service implementation may contain file-unfriendly characters (e.g. OpenStreetMap: 5/16/10.png).

        When building an id, you should use the service name as a prefix (e.g. for OpenStreetMap: "Mapnik", "CycleMap"; Bing Maps: "Road", "Hybrid"; etc) and suffix the id with a file-friendly string (e.g. OpenStreetMap: "Mapnik_X_Y_Z").

      • getCode

        public abstract String getCode()
        Gets the code of a tile.

        The id is a string which uniquely identifies a tile. In some service implementations this is a quadkey (e.g. Bing Maps: "03123") or the fragment of the tile image (e.g. OpenStreetMap: 5/16/10.png, for Z/X/Y.png).

        the code
      • getRightNeighbour

        public abstract TileIdentifier getRightNeighbour()
      • getLowerNeighbour

        public abstract TileIdentifier getLowerNeighbour()