Guice：如何获取TypeLiteral包装的泛型的实例？ [英] Guice: How do I get an instance of a TypeLiteral-wrapped generic?

问题描述

我有一个通用数据库访问类，我使用TypeLiteral结构进行绑定。现在在测试中我想模拟该类，并且我已经创建了一个Provider，它创建了一个模拟实例。在我的测试中，我想访问该模拟来定义其行为。
现在问题是，如何从进样器中检索对象？

I have a generic database access class, which i'm binding using the TypeLiteral construct. Now in a test i want to mock that class and i have therefor created a Provider, that creates a mock instance. In my test, i want to access that mock to define its behaviour. Now the question is, how can i retrieve the object from the injector?

这是我的绑定定义：

binder.bind(new TypeLiteral<GenericDbClass<Integer>>(){}).GenericDbClassProvider.class);

通常我会得到这样的实例：

Normally i would get an instance like this:

injector.getInstance(GenericDbClass.class);

但由于我没有将GenericDbClass的实现绑定到接口本身，我不知道怎么做。我认为复杂吗？

But since i'm not binding the implementation of GenericDbClass to the Interface itself, i don't know how to do that. Do I think to complicated?

非常感谢任何想法/帮助！

Any ideas/help is greatly appreciated!

推荐答案

使用Guice的密钥工具，这是针对这类问题而设计的。在你的情况下

Use Guice's Key facility, which is made for exactly this kind of problem. In your case

injector.getInstance(Key.get(new TypeLiteral<GenericDbClass<Integer>>(){});

可以解决问题。

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