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https://issues.apache.org/jira/browse/LANG-745?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Yandell updated LANG-745:
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Fix Version/s: (was: Patch Needed)
Discussion
> StrLookup API confusing
> -----------------------
>
> Key: LANG-745
> URL: https://issues.apache.org/jira/browse/LANG-745
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.*
> Affects Versions: 3.0
> Reporter: Etienne Neveu
> Fix For: Discussion
>
>
> [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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