code: @SuppressWarnings("unchecked")
      public static Map<String, List<Class<? extends WindupVertexFrame>>> getMappings(GraphRewrite event)
      {
          Map<String, List<Class<? extends WindupVertexFrame>>> map = (Map<String, List<Class<? extends WindupVertexFrame>>>) event
                      .getRewriteContext().get(FileMapping.class);
          if (map == null)
          {
              map = new HashMap<>();
              event.getRewriteContext().put(FileMapping.class, map);
          }
          return map;
      }
docs: Get the list of pattern to {@link WindupVertexFrame} type mappings for the {@link GraphRewrite} event.