Unrelated object functional abstraction

mapper.java

private static <T> Map<Class<T>, Function<T, List<JAXBElement<?>>>> mappings() {
      return ImmutableMap.<Class<T>, Function<T, List<JAXBElement<?>>>>builder()
              .put(BinaryLogicOpType.class, new Function<BinaryLogicOpType, List<JAXBElement<?>>>() {
                @Override
                public List<JAXBElement<?>> apply(BinaryLogicOpType t) {
                  return null;
                }
              })
              .build();
    }