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https://issues.apache.org/jira/browse/HADOOP-5073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12751576#action_12751576
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Tsz Wo (Nicholas), SZE commented on HADOOP-5073:
------------------------------------------------
It is hard to get nested annotations correct. I still think that Public,
LimitedPrivate and Private are values of Audience.
If we are going to do nested annotations, I suggest to followings:
- Audience indeed is an annotation container. So it should be a class with a
private constructor but not itself an annotation. Otherwise, someone may use
@Audience later.
- We also have to repeat @Documented and @Inherited for each nested
annotations.
- From the
[doc|http://java.sun.com/javase/6/docs/technotes/guides/language/annotations.html],
it says "In annotations with a single element, the element should be named
value, ... ". So the "target" in LimitedPrivate should be renamed to "value".
{code}
public final class Audience {
private Audience() {}
@Documented
@Inherited
public @interface Public {}
@Documented
@Inherited
public @interface LimitedPrivate {
String[] value();
}
@Documented
@Inherited
public @interface Private {}
}
{code}
> Hadoop 1.0 Interface Classification - scope (visibility - public/private) and
> stability
> ---------------------------------------------------------------------------------------
>
> Key: HADOOP-5073
> URL: https://issues.apache.org/jira/browse/HADOOP-5073
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
> Attachments: 5073_demo.png, c5073_20090825.patch, c5073_20090825.png,
> HADOOP-5073.patch, Nested.png, Picture 1.png
>
>
> This jira proposes an interface classification for hadoop interfaces.
> The discussion was started in email alias core-...@hadoop.apache.org in Nov
> 2008.
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