[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-1312) Extend Compoent.initInterceptors to scan Annnotations on methods for additional interceptors

[Chris Rudd (JIRA)]

Extend Compoent.initInterceptors to scan Annnotations on methods for additional interceptors
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                 Key: JBSEAM-1312
                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1312
             Project: JBoss Seam
          Issue Type: Feature Request
          Components: Core
    Affects Versions: 1.2.1.GA
            Reporter: Chris Rudd


It would be nice if the Component.initInterceptors method not only scanned the annotations on the class for additional interceptors but also scanned the methods / fields for additional interceptors.

This would allow more flexability. 

EG the @LoggedIn from the examples could be extended so that it checked for a class level or method level @LoggedIn annotation to instruct it to do the check (instead of only the class level as it is now). Naturally you would want to remove the class level annotation and only put it on the methods that require being logged in. BUT if you do that, the auto-magic initInterceptor code wont know to add the LoggedInInterceptor.


Altered initInterceptors:

    private void initInterceptors()
    {
       initDefaultInterceptors();

       findInterceptors(new AnnotatedElement[] { component.getBeanClass() });

       for (Class clazz = component.getBeanClass(); clazz != Object.class; clazz = clazz
                 .getSuperclass())
       {
           findInterceptors(clazz.getDeclaredFields());

           findInterceptors(clazz.getDeclaredMethods());
       }
    }
    
Additional support method :

    protected void findInterceptors(AnnotatedElement[] aes)
    {
        for (AnnotatedElement ae : aes)
        {
            for (Annotation annotation : ae.getAnnotations())
            {
                if ( annotation.annotationType().isAnnotationPresent(INTERCEPTORS) )
                {
                    Class[] classes = value( annotation.annotationType().getAnnotation(INTERCEPTORS) );
                    addInterceptor( new Interceptor(classes, annotation, this) );
                }
                if ( annotation.annotationType().isAnnotationPresent(Interceptors.class) )
                {
                    Class[] classes = annotation.annotationType().getAnnotation(Interceptors.class).value();
                    addInterceptor( new Interceptor(classes, annotation, this) );
                }
            }
        }
    }



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