code: private List<ResultMap> getResultMap(String namespace, Class<?> clazz, Configuration conf) {
      String dynamicResultMapId = namespace + "." + GENERATE_RESULT_MAP_NAME;
      ResultMap dynamicResultMap = buildResultMap(dynamicResultMapId, clazz, conf);
      List<ResultMap> resultMaps = Lists.newArrayList();
      resultMaps.add(dynamicResultMap);
      return Collections.unmodifiableList(resultMaps);
    }
docs: 生成泛型对应的ResultMap
  
  @param namespace
  @param clazz
  @param conf
  @return