guice-aop named parameters

[Carlos Alexandro Becker]

I'm taking a look at guice aop integration... and wonder something:

If I have a named parameter like this:

@RequiresPermission(permission = Permission.WRITE)

public void needsWrite(@Named("test") User u, @Named("test2") String t) {

System.out.println("I write something :) " + t);

}

Can I get these parameters by Named annotations in my method interceptor?

Thanks

[Fred Faber]

Yes, something like this:

  void findAnnotatedArguments(MethodInvocation methodInvocation) {    Method method = methodInvocation.getMethod();
    checkArgument(
        method.isAnnotationPresent(RequiresPermission.class),
        "Unexpected method passed to the Interceptor: %s",
        method);

    Object[] methodArguments = methodInvocation.getArguments();
    Type[] genericParameterTypes = method.getGenericParameterTypes();
    Annotation[][] annotationsOfParameters = method.getParameterAnnotations();
    for (int i = 0; i < annotationsOfParameters.length; i++) {
      Annotation[] annotationsOfParameter = annotationsOfParameters[i];
      for (Annotation annotation : annotationsOfParameter) {
        if (Named.class.isInstance(annotation)) {
          ... do whatever you want
        }
      }
     }
   }

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[Carlos Alexandro Becker]

hmm.. but this way, how I get the value of the field?

thanks.

Yes, something like this:

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[Fred Faber]

http://code.google.com/p/google-guice/source/search?q=Named&origq=Named&btnG=Search+Trunk

[Fred Faber]

Not the helpful link I wanted.

In any event, you can call value() on an instance of Named to get its value.

[Carlos Alexandro Becker]

hmm

I still don't understanding how can I get the value of the parameter..

[Fred Faber]

do you mean value of the argument?

methodArguments[i]?

[Carlos Alexandro Becker]

Ooww yeah 

My mistake.

It worked (methodArguments[i]), thanks man :P