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我正在进行思想实验来调查增强 Place 类的可行性。假设 Google 会为我们提供这样的增强功能，那么 Place 类的以下增强功能会有所帮助吗？

让我们说 Place 类被增强为具有方法

setActivity(Activity act)

然后，我们将能够做到这一点：

public class StartActivity extends AbstractActivity implements Presenter {

    private ClientFactory clientFactory;
    private String name;

    public StartActivity(StartPlace place, ClientFactory clientFactory) {
        this.clientFactory = clientFactory;
        this.name = place.getName();
        place.setActivity(this);
    }
}

这样 ActivityMapper 就会如此简单......

public class DenLapehActivityMapper
implements ActivityMapper{
    @Override
    public Activity getActivity(Place place){
            return place.getActivity();
    }
}

然而，我的思想实验，权衡当前的情况，导致我不得不做这些

abstract public class DenLapehPlace
extends  Place{
    private Activity activity;

    public Activity getActivity(){
        return activity;
    }

    public void setActivity(Activity activity){
        this.activity = activity;
    }
}

public class DenLapehActivityMapper
implements ActivityMapper{
    @Override
    public Activity getActivity(Place place){
        if (place instanceof DenLapehPlace)
            return ((DenLapehPlace)place).getActivity();

        return null;
    }
}

或者更糟糕的是，遵循示例/教程......

public class DenLapehActivityMapper
implements ActivityMapper{
    @Override
    public Activity getActivity(Place place){

        if (place instanceof AyamDenLapehPlace)
            return KurungAyamActivity;
        if (place instanceof ItekDenLapehPlace)
            return KurungItekActivity;
        if (place instanceof KabauDenLapehPlace)
            return KurungKabauActivity;
        if (place instanceof KancilDenLapehPlace)
            return KurungKancilActivity;        
        etc, etc, etc ...

        return null;
    }
}

如果你是 GWT 开发团队，是否有任何技术动机（或消极动机）来做出这种改变？更好的是，如果您是 GWT 开发团队。你为什么不做这个改变？

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1 回答 1

2

仅仅是因为预计单个给定地点会有许多活动。

见http://blog.ltgt.net/gwt-21-activities/和http://blog.ltgt.net/gwt-21-activities-nesting-yagni/

于 2011-08-27T00:51:59.590 回答