Java(TM) Boutique - Deliver On-the-Fly Mapping Services to Your Rich Desktop Java Application, Part 2

Listing 4: Generating a tile URL in the XMLTileFactoryInfo class's getTileUrl method.

public String getTileUrl(int x, int y, int zoom) {
  if (buildURLFunctionJS == null) {
    if (context == null) {
      context = Context.enter();
    }
    try {
      scope = context.initStandardObjects(null);
      buildURLFunctionJS = context.compileFunction(scope,
          buildURLFunction, "BUILDURL.JS", 1, null);
    } catch (Exception e) {
      throw new RuntimeException(getName() + ": could not compile \n"
          + buildURLFunction, e);
    } finally {
      Context.exit();
    }
  }
  Object jsResult = null;
  Context.enter();
  try {
    jsResult = buildURLFunctionJS.call(context, scope,
        (Function) buildURLFunctionJS, new Object[] { x, y, zoom,
            getTotalMapZoom() });
  } catch (JavaScriptException e) {
    throw new RuntimeException(getName() + ": could execute \n"
        + buildURLFunction, e);
  } finally {
    Context.exit();
  }
  String url = Context.toString(jsResult);
  return url;
}

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