AspectJ的 ​​- 检索注解参数列表 [英] AspectJ - Retrieve list of annotated parameters

问题描述

从下面的previous问题（<一个href=\"http://stackoverflow.com/questions/10554453/aspectj-$p$psence-of-annotation-in-join-point-ex$p$pssion-not-recognized\">AspectJ - 注释presence在连接点前pression无法识别）

From the following previous question (AspectJ - Presence of annotation in join point expression not recognized),

我的目标：
在一个方面，我希望能够提取/从匹配功能检索所有注解参数，不管有多少。 （然后应用上的一些治疗，但它不是这个问题的范围）

My goal: In an aspect, i'd like to be able to extract/retrieve all annotated parameters from matching functions, no matter how many there are. (and then apply some treatment on but it's not the scope of this question)

所以就目前而言，这是我做了什么（不工作）：

So for the moment, this is what i did (not working):

@Before("execution (* org.xx.xx.xx..*.*(@org.xx.xx.xx.xx.xx.Standardized (*),..))")
public void standardize(JoinPoint jp) throws Throwable {
    Object[] myArgs = jp.getArgs();
    getLogger().info("Here: arg length=" + myArgs.length);
    // Roll on join point arguments
    for (Object myParam : myArgs) {

        getLogger().info(
                    "In argument with " + myParam.getClass().getAnnotations().length
                                + " declaread annotations");
        getLogger().info("Class name is " + myParam.getClass().getName());
        // Get only the one matching the expected @Standardized annotation
        if (myParam.getClass().getAnnotation(Standardized.class) != null) {
            getLogger().info("Found parameter annotated with @Standardized");
            standardizeData(myParam.getClass().getAnnotation(Standardized.class), myParam);
        }
    }
}

这是code。通过意见一致：

This is the code matched by the advice:

public boolean insertLog(@Standardized(type = StandardizedData.CLIPON) CliponStat theStat) {
    // ...
}

和一个JUnit测试所产生的痕迹：

And the traces generated by a junit test:

INFO: ICI: arg lenght=1
INFO: In argument with 0 declaread annotations

看起来它未检测到注解

Looks like it doesn't detect the annotation

所以我的问题是：如何检测具有特定注释（S）参数

So my question is: how to detect parameters which have specific annotation(s) ?

是否有人有一个想法，该怎么办呢？

Does somebody have an idea how to do it?

在此先感谢您的帮助。

问候。

编辑：我发现这个线程<一个href=\"http://stackoverflow.com/questions/3565718/pointcut-matching-methods-with-annotated-parameters/3567170#3567170\">Pointcut匹配带注释的参数的方法，同样的事情讨论，并应用了给出的解决方案，但它不能正常工作。

i found this thread Pointcut matching methods with annotated parameters, discussing of the same thing, and applied the given solution but it doesn't work..

推荐答案

我希望我理解你的权利。

I hope I understand you right.

myParam.getClass（）。getAnnotations（）为您提供了一个类的注释。是这样的：

myParam.getClass().getAnnotations() gives you the annotations on a class. Something like:

@Standardized(type = StandardizedData.CLIPON)
public class Main{...}

也许这个切入点/建议可以帮助你：

Maybe this pointcut/advice helps you:

@Before("execution (* org.xx.xx.xx..*.*(@org.xx.xx.xx.xx.xx.Standardized (*),..))")
public void standardize(JoinPoint jp) throws Throwable {
    Object[] args = jp.getArgs();
    MethodSignature ms = (MethodSignature) jp.getSignature();
    Method m = ms.getMethod();

    Annotation[][] parameterAnnotations = m.getParameterAnnotations();

    for (int i = 0; i < parameterAnnotations.length; i++) {
        Annotation[] annotations = parameterAnnotations[i];
        System.out.println("I am checking parameter: " + args[i]);
        for (Annotation annotation : annotations) {
            System.out.println(annotation);

            if (annotation.annotationType() == Standardized.class) {
                System.out.println("we have a Standardized Parameter with type = "
                        + ((Standardized) annotation).type());
            }
        }
    }
}

这给了我下面的输出：

I am checking parameter:  main.CliponStat@331f2ee1 
@annotation.Standardized(type=CLIPON)
we have a Standardized Parameter with type = CLIPON

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