code: public String toAbsolute(String target) {
  
          if (isNotInitialized()) {
              return getMessage(NOT_INITIALIZED);
          }
          return CmsLinkManager.getAbsoluteUri(target, getController().getCurrentRequest().getElementUri());
      }
docs: Converts a relative URI in the OpenCms VFS to an absolute one based on
  the location of the currently processed OpenCms URI.<p>
  
  @param target the relative URI to convert
  @return the target URI converted to an absolute one