code: protected String computeCurrentFolder() {
  
          String currentFolder = getSettings().getExplorerResource();
          if (currentFolder == null) {
              // set current folder to root folder
              try {
                  currentFolder = getCms().getSitePath(getCms().readFolder("/", CmsResourceFilter.IGNORE_EXPIRATION));
              } catch (CmsException e) {
                  // can usually be ignored
                  if (LOG.isInfoEnabled()) {
                      LOG.info(e);
                  }
                  currentFolder = "/";
              }
          }
          if (!currentFolder.endsWith("/")) {
              // add folder separator to currentFolder
              currentFolder += "/";
          }
          return currentFolder;
      }
docs: Returns the full path of the current workplace folder.<p>
  
  @return the full path of the current workplace folder