如何一次匹配类型OR方法注释

Question

我想拥有一个Guice拦截器，该拦截器拦截对带注释的类或带注释的方法的调用。我希望能够将两者结合起来。用具有不同属性的方法注释覆盖类注释。

我的工作方式如下：

// Intercept all METHODS annotated with @MyAnnotation
bindInterceptor(
    Matchers.any(),
    Matchers.annotatedWith(company.MyAnnotation),
    new TracingInterceptor());

// Intercept all methods in CLASSES annotated with @MyAnnotation
bindInterceptor(
    Matchers.annotatedWith(company.MyAnnotation),
    Matchers.any(),
    new TracingInterceptor());

但是，当我注释这样的课程时：

@MyAnnotation    
class MyClass {
    @MyAnnotation
    public void myMethod() {}
}

拦截器被调用两次，这很糟糕！

有什么方法可以避免两次触发拦截器，但是行为相同？

Answer 1

您可以通过使绑定器互斥来实现此目的，如下所示：

// Intercept all METHODS annotated with @MyAnnotation in classes not annotated with @MyAnnotation
bindInterceptor(
    Matchers.not(Matchers.annotatedWith(company.MyAnnotation)),
    Matchers.annotatedWith(company.MyAnnotation),
    new TracingInterceptor());

// Intercept all methods not annotated with @MyAnnotation in CLASSES annotated with @MyAnnotation
bindInterceptor(
    Matchers.annotatedWith(company.MyAnnotation),
    Matchers.not(Matchers.annotatedWith(company.MyAnnotation)),
    new TracingInterceptor());

// Intercept all METHODS not annotated with @MyAnnotation in CLASSES annotated with @MyAnnotation
bindInterceptor(
    Matchers.annotatedWith(company.MyAnnotation),
    Matchers.annotatedWith(company.MyAnnotation),
    new TracingInterceptor());