java - 哪种设计模式最适合避免方法中的多个参数

Question

我有以下类(class):

public class SomeAssebler {

    private EnrichedRequest assembleBasicEnrichedRequest(BasicRequest request) {
        EnrichedRequest enrichedRequest = new EnrichedRequest();
        if (request != null) {
            enrichedRequest.setId(request.getId());
            enrichedRequest.setDate(request.getDate());
            enrichedRequest.setParam(request.getParam());
        }
        return enrichedRequest;
    }

    private static EnrichedRequest assembleGeoDataEnrichedRequest(EnrichedRequest request, GeoData geoData) {
        EnrichedRequest geoEnrichedRequest = Optional.ofNullable(request).orElse(new EnrichedRequest());
        if (geoData != null) {
            geoEnrichedRequest.setCity(geoData.getCity());
            geoEnrichedRequest.setCountryCode(geoData.getCountryCode());
        }
        return geoEnrichedRequest;
    }

    private static EnrichedRequest assembleUserAgentEnrichedRequest(EnrichedRequest request, UserAgentData userAgentData) {
        EnrichedRequest userAgentEnrichedRequest = Optional.ofNullable(request).orElse(new EnrichedRequest());
        if (userAgentData != null) {
            userAgentEnrichedRequest.setBrowser(userAgentData.getBrowserCode());
            userAgentEnrichedRequest.setOperatingSystem(userAgentData.getOsCode());
            userAgentEnrichedRequest.setManufacturer(userAgentData.getBrand());
        }
    }

    public static EnrichedRequest assembleEnrichedRequest(BasicRequest request, GeoData geoData, UserAgentData userAgentData) {
        EnrichedRequest enrichedRequest = assembleBasicEnrichedRequest(request);
        enrichedRequest = assembleGeoDataEnrichedRequest(enrichedRequest, geoData);
        enrichedRequest = assembleUserAgentEnrichedRequest(enrichedRequest, userAgentData);
        return enrichedRequest;
    }
}

然后在不同的变压器中调用它:在地理数据转换器中

new KeyValue<>(key, assembleEnrichedRequest(basicRequest, geoData, null))

在 UserAgentTransformer 中:

new KeyValue<>(key, assembleEnrichedRequest(enrichedRequest, null, userAgent))

如果将来添加更多“丰富器”，这可能会变得非常难看。有人知道我如何才能更好地设计这个吗？我想到了 Builder 设计模式，但我不确定。

Answer 1

您可以使用Builder Pattern，但您必须对代码进行一些更改。

你可以从这个link查看它解释了如何使用构建器模式及其解决的问题。您可以尝试类似的方法，有很多不同的方法来创建 Builder 类。

public static class EnrichedRequestBuilder() {
    private EnrichedRequest enrichedRequest:
    private BasicRequest basicRequest:
    private GeoData geoData;
    private UserAgentData userAgentData;

    public EnrichedRequestBuilder enrichedRequest(EnrichedRequest e) {
        this.enrichedRequest = e;
        return this;
    }

    public EnrichedRequestBuilder basicRequest(BasicRequest e) {
        this.basicRequest = e;
        return this;
    }

    public EnrichedRequestBuilder build() {
        return new EnrichedRequestBuilder(this);
    }


}

new EnrichedRequestBuilder().basicRequest(b).enrichedRequest(e).build();