*/
Platform.nullToEmpty = function(str) {
  return str || "";
};


/**
 * @param {?string} str
 * @return {string} Original str, if it is non-empty. Otherwise null;
 */
Platform.emptyToNull = function(str) {
  return str || null;

    return !string;
  }-*/;

  @JsMethod
  static native String nullToEmpty(@Nullable String string) /*-{
    return string || "";
  }-*/;

  @JsMethod
  static native String emptyToNull(@Nullable String string) /*-{
    return string || null;
  }-*/;

  static CommonPattern compilePattern(String pattern) {
    throw new UnsupportedOperationException();
  }