DI，Guice和策略模式 [英] DI, Guice and Strategy Pattern

问题描述

假设我有以下基类，Queen和Knight作为其派生类。 WeaponBehaviour是一个界面。根据具体的GameCharacter类型，我无法弄清楚如何使用Guice注入武器。

Suppose I have the following base class, Queen and Knight as its derivatives. WeaponBehaviour is an interface. I can't figure out how to inject weapons using Guice depending on the concrete GameCharacter type.

public abstract class GameCharacter {
    @Inject
    protected WeaponBehaviour weapon;

    public GameCharacter() {

    }

    public void fight() {
        weapon.useWeapon();
    }

    public void setWeapon(WeaponBehaviour weapon) {
        this.weapon = weapon;
    }
}

推荐答案

您可以使用绑定注释。

一个子类：

class GimliSonOfGloin extends GameCharacter {

    @Inject
    public void setWeapon(@Axe WeaponBehaviour weapon) {
        super.setWeapon(weapon);
    }
}

注释：

@BindingAnnotation 
@Target({ FIELD, PARAMETER, METHOD }) 
@Retention(RUNTIME)
public @interface Axe {}

绑定：

bind(WeaponBehaviour.class)
    .annotatedWith(Axe.class)
    .to(MyAxe.class);

这篇关于DI，Guice和策略模式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！