private void downloadImage(final MercatorTextureTile tile, String mimeType) throws Exception {
    //        System.out.println(tile.getPath());
    final URL resourceURL = tile.getResourceURL(mimeType);
    Retriever retriever;

    String protocol = resourceURL.getProtocol();

    if ("http".equalsIgnoreCase(protocol)) {
      retriever = new HTTPRetriever(resourceURL, new HttpRetrievalPostProcessor(tile));
    } else {
      String message =
          Logging.getMessage("layers.TextureLayer.UnknownRetrievalProtocol", resourceURL);
      throw new RuntimeException(message);
    }

    retriever.setConnectTimeout(10000);
    retriever.setReadTimeout(20000);
    retriever.call();
  }
  /**
   * Create a new <code>ColladaRoot</code> for a {@link URL}.
   *
   * @param docSource the URL of the document.
   * @throws IllegalArgumentException if the document source is null.
   * @throws IOException if an error occurs while reading the Collada document.
   */
  public ColladaRoot(URL docSource) throws IOException {
    super(ColladaConstants.COLLADA_NAMESPACE);

    if (docSource == null) {
      String message = Logging.getMessage("nullValue.DocumentSourceIsNull");
      Logging.logger().severe(message);
      throw new IllegalArgumentException(message);
    }

    URLConnection conn = docSource.openConnection();
    this.colladaDoc = new ColladaInputStream(conn.getInputStream(), WWIO.makeURI(docSource));

    this.initialize();
  }
  private BufferedImage requestImage(MercatorTextureTile tile, String mimeType)
      throws URISyntaxException {
    String pathBase = tile.getPath().substring(0, tile.getPath().lastIndexOf("."));
    String suffix = WWIO.makeSuffixForMimeType(mimeType);
    String path = pathBase + suffix;
    URL url = WorldWind.getDataFileStore().findFile(path, false);

    if (url == null) // image is not local
    return null;

    if (WWIO.isFileOutOfDate(url, tile.getLevel().getExpiryTime())) {
      // The file has expired. Delete it.
      WorldWind.getDataFileStore().removeFile(url);
      String message = Logging.getMessage("generic.DataFileExpired", url);
      Logging.logger().fine(message);
    } else {
      try {
        File imageFile = new File(url.toURI());
        BufferedImage image = ImageIO.read(imageFile);
        if (image == null) {
          String message = Logging.getMessage("generic.ImageReadFailed", imageFile);
          throw new RuntimeException(message);
        }

        this.levels.unmarkResourceAbsent(tile);
        return image;
      } catch (IOException e) {
        // Assume that something's wrong with the file and delete it.
        gov.nasa.worldwind.WorldWind.getDataFileStore().removeFile(url);
        this.levels.markResourceAbsent(tile);
        String message = Logging.getMessage("generic.DeletedCorruptDataFile", url);
        Logging.logger().info(message);
      }
    }

    return null;
  }
  /**
   * Open and parse the specified file expressed as a file: URL..
   *
   * @param url the URL of the file to open, expressed as a URL with a scheme of "file".
   * @param linkBase the original address of the document if the file is a retrieved and cached
   *     file.
   * @return A {@code ColladaRoot} representing the file's COLLADA contents.
   * @throws IOException if an I/O error occurs during opening and parsing.
   * @throws XMLStreamException if a server parsing error is encountered.
   */
  protected ColladaRoot parseCachedColladaFile(URL url, String linkBase)
      throws IOException, XMLStreamException {
    ColladaDoc colladaDoc;

    InputStream refStream = url.openStream();

    colladaDoc = new ColladaInputStream(refStream, WWIO.makeURI(linkBase));

    try {
      ColladaRoot refRoot = new ColladaRoot(colladaDoc);
      refRoot.parse(); // also closes the URL's stream
      return refRoot;
    } catch (XMLStreamException e) {
      refStream.close(); // parsing failed, so explicitly close the stream
      throw e;
    }
  }