code: private static boolean checkThemeFile(final String name) {
  		return !(Util.empty(name) // name must exist
  				|| name.contains("..") // prevent directory traversal
  				|| name.charAt(0) == '/' // all theme references should be relative
  				|| name.indexOf(':') != -1 // forbid use of protocols such as jar:, http: etc.
  				);
  	}
docs: Performs basic sanity checks on the file being requested.
  
  @param name the file name
  @return true if the requested file name is ok, false if not.