[jira] [Updated] (LOG4J2-621) Pattern To Drop First X Package Parts

["Kamal Mettananda (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LOG4J2-621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kamal Mettananda updated LOG4J2-621:
------------------------------------
    Attachment: LOG4J2-621_01.patch

Hi all

I analysed the code and the change is required around the org.apache.logging.log4j.core.pattern.NameAbbreviator.

So I implemented test cases for the existing feature where the parts are retained from the end of the names, Then implemented test cases for the new feature where the parts are dropped from the front of the names.

To provide this feature, I have implemented a new class named org.apache.logging.log4j.core.pattern.NameAbbreviator.DropFirstElementsAbbreviator which will analyse the name and drop from the start of the name using "." separator.

All the test cases are passing 100%. 

I have attached that feature as a patch ([^LOG4J2-621_01.patch]) including test cases. 

Could you please review that and provide your thoughts?

Thanks

> Pattern To Drop First X Package Parts
> -------------------------------------
>
>                 Key: LOG4J2-621
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-621
>             Project: Log4j 2
>          Issue Type: Wish
>          Components: Layouts
>    Affects Versions: 2.0-rc1
>            Reporter: Lee Theobald
>            Priority: Trivial
>         Attachments: LOG4J2-621_01.patch
>
>
> Currently you can have a pattern that will print out the last X parts of you package.  So if my package was {{uk.co.ltheobald.foo.bar}}, then using {{%logger\{2\}}} will print {{foo.bar}}.  But when I have a number of different package levels, this becomes less useful (in my opinion).
> What I'd find more useful is the inverse where I can ditch the first X parts.  Something like {{%logger\{-3\}}} for example.  That way I'd end up with:
> {{uk.co.ltheobald.Main logging}} as {{Main}}
> {{uk.co.ltheobald.foo.MyClass}} logging as {{foo.MyClass}}
> {{uk.co.ltheobald.foo.bar.MyOtherClass}} logging as {{foo.bar.MyOtherClass}}
> Removing from the start of the logger name allows me to consistently trim off package names that I know are always the same.  I'll see if I can produce a code example for this if I get time but I wanted to log it in the meanwhile.



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