code: protected CmsFolder readFolder(CmsDbContext dbc, String resourcename, CmsResourceFilter filter)
      throws CmsException {
  
          CmsResource resource = readResource(dbc, resourcename, filter);
          return m_driverManager.convertResourceToFolder(resource);
      }
docs: Reads a folder from the VFS, using the specified resource filter.<p>
  
  @param dbc the current database context
  @param resourcename the name of the folder to read (full path)
  @param filter the resource filter to use while reading
  
  @return the folder that was read
  
  @throws CmsException if something goes wrong