java - Java中如何避免方法重载以避免重复？

Question

我有 2 种方法，它们执行 80% 相同的工作，但结果处理不同。我正在做:

 private <T> T getResponse(final RestURI query, final Class<T> responseClass) throws IOException {
        T response = null;

        final RestResponse<Record> tempResponse = getResponseFromDataPath(query);

        if (isResponseOK(tempResponse, query)) {
            final CustomReader reader = createCustomReaderFromResponse(tempResponse);
            response = objectMapper.readValue(reader, responseClass);
                                                          ^
            // DIFFERENCE --------------------------------|
        }

        return response;
    }

    private <T> T getResponse(final RestURI query, final TypeReference valueTypeRef) throws IOException {
        T response = null;

        final RestResponse<Record> tempResponse = getResponseFromDataPath(query);

        if (isResponseOK(tempResponse, query)) {
            final CustomReader reader = createCustomReaderFromResponse(tempResponse);
            response = objectMapper.readValue(reader, valueTypeRef);
                                                          ^
            // DIFFERENCE --------------------------------|
        }

        return response;
    }

这看起来有很多重复。我该如何做才能减少重复项。

Answer 1

您可以使用调用objectMapper的BiFunction参数:

private <T> T getResponse(final RestURI query, 
    final BiFunction<CustomReader, ObjectMapper, T> mapper) throws IOException {
    T response = null;

    final RestResponse<Record> tempResponse = getResponseFromDataPath(query);

    if (isResponseOK(tempResponse, query)) {
        final CustomReader reader = createCustomReaderFromResponse(tempResponse);
        response = mapper.apply(reader, objectMapper); 
    }

    return response;
}

调用者可以选择如何调用objectMapper:

getResponse(query, 
   (reader, objectMapper) -> objectMapper.readValue(reader, <valueTypeRef>);

或者:

getResponse(query, 
    (reader, objectMapper) -> objectMapper.readValue(reader, <class>);