如何防止Guice注入模块中未绑定的类? [英] How do you prevent Guice from injecting a class not bound in the Module?

问题描述

import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;

public class GuiceDemo
{
    public static void main(String[] args)
    {
        new GuiceDemo().run();
    }

    public void run()
    {
        Injector injector = Guice.createInjector(new EmptyModule());
        DemoInstance demoInstance = injector.getInstance(DemoInstance.class);
        assert(demoInstance.demoUnbound == null);
    }

    public static class EmptyModule extends AbstractModule
    {
        @Override
        protected void configure()
        {
        }
    }

    public static class DemoInstance
    {
        public final DemoUnbound demoUnbound;

        @Inject
        public DemoInstance(DemoUnbound demoUnbound)
        {
            this.demoUnbound = demoUnbound;
        }
    }

    public static class DemoUnbound
    {
    }
}

我可以阻止Guice向DemoInstance的构造函数提供DemoUnbound的实例吗?

Can I prevent Guice from providing an instance of DemoUnbound to the constructor of DemoInstance?

本质上，我正在寻找一种在完全显式绑定模式下运行Guice的方法，其中注入未绑定的类是错误的.

In essence I am looking for a way to run Guice in a totally explicit binding mode where injecting an unbound class is an error.

Guice注入未在模块中绑定的类如何使您出错?

How do you make it an error to Guice inject a class not bound in the Module?

推荐答案

如果您在此处使用接口而不是DemoUnbound的具体类，那么Guice将抛出异常，因为它找不到合适的注入类:

If you use an interface here instead of a concrete class for DemoUnbound, Guice will throw an exception because it cannot find a suitable class to inject:

public class GuiceDemo
{
    public static void main(String[] args)
    {
        new GuiceDemo().run();
    }

    public void run()
    {
        Injector injector = Guice.createInjector(new EmptyModule());
        DemoInstance demoInstance = injector.getInstance(DemoInstance.class);
        assert(demoInstance.demoUnbound == null);
    }

    public static class EmptyModule extends AbstractModule
    {
        @Override
        protected void configure()
        {
        }
    }

    public static class DemoInstance
    {
        public final DemoUnbound demoUnbound;

        @Inject
        public DemoInstance(DemoUnbound demoUnbound)
        {
            this.demoUnbound = demoUnbound;
        }
    }

    public interface DemoUnbound
    {
    }
}

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