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From "Pascal Schumacher (JIRA)" <j...@apache.org>
Subject [jira] [Moved] (TEXT-80) StrLookup API confusing
Date Wed, 19 Apr 2017 15:36:41 GMT

     [ https://issues.apache.org/jira/browse/TEXT-80?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pascal Schumacher moved LANG-745 to TEXT-80:
--------------------------------------------

        Fix Version/s:     (was: Discussion)
    Affects Version/s:     (was: 3.0)
          Component/s:     (was: lang.*)
             Workflow: jira  (was: Default workflow, editable Closed status)
                  Key: TEXT-80  (was: LANG-745)
              Project: Commons Text  (was: Commons Lang)

> StrLookup API confusing
> -----------------------
>
>                 Key: TEXT-80
>                 URL: https://issues.apache.org/jira/browse/TEXT-80
>             Project: Commons Text
>          Issue Type: Bug
>            Reporter: Etienne Neveu
>
> [bayard: copying this from LANG-564]
> I don't see the point of having a generic type parameter on the StrLookup class, if it's
not used anywhere. No method / field in StrLookup references this type parameter. IntelliJ
IDEA itself reports a warning: "Type parameter 'V' is never used". Moreover, Java generics
are not reified, so there is no reliable way to access the type parameter at runtime (and
I don't see the point of doing that anyway...).
> While the Javadoc tries to clarify the purpose of a StrLookup, the unused type parameter
is still confusing, and the client code has to un-necessarily specify type parameters. For
example, I have to write:
> StrLookup<?> lookup = StrLookup.noneLookup();
> StrLookup<String> lookup2 = StrLookup.systemPropertiesLookup();
> StrLookup<Integer> lookup3 = StrLookup.mapLookup(integerMap);
> instead of
> StrLookup lookup = StrLookup.noneLookup();
> StrLookup lookup2 = StrLookup.systemPropertiesLookup();
> StrLookup lookup3 = StrLookup.mapLookup(integerMap);
> My best guess is that this type parameter was added when commons-lang was generified,
because StringLookup.mapLookup() takes a generified Map. Doing this is not really needed,
though: we could remove the <V> type parameter everywhere, and replace the StrLookup.mapLookup()'s
Map<String, V> with a Map<String, ?> (which is the same as Map<String, ? extends
Object>, but shorter).
> I guess it's too late to change this now, due to backward compatibility... But I thought
I'd comment just in case it's still possible.



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