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From "Thomas Neidhart (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COLLECTIONS-502) Generic parameter inconsistency on various INSTANCE fields
Date Wed, 20 Nov 2013 21:12:35 GMT

    [ https://issues.apache.org/jira/browse/COLLECTIONS-502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13828121#comment-13828121
] 

Thomas Neidhart commented on COLLECTIONS-502:
---------------------------------------------

InstantiateTransformer.NO_ARG_INSTANCE made private and use raw type.
Factory method instantiateTransformer() returns NO_ARG_INSTANCE cast to the generic type.

> Generic parameter inconsistency on various INSTANCE fields
> ----------------------------------------------------------
>
>                 Key: COLLECTIONS-502
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-502
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Functor
>    Affects Versions: 4.0
>            Reporter: Emmanuel Bourg
>            Priority: Trivial
>
> In {{FalsePredicate}} the {{INSTANCE}} singleton is defined as {{Predicate<Object>}}.
In other predicates such as {{TruePredicate}} it's
> defined as {{Predicate<?>}}. In both cases this prevents the declaration of:
> {code}
> Predicate<Foo> predicate = FalsePredicate.INSTANCE;
> {code}
> This will fail to compile.
> I suggest declaring the INSTANCE fields as an ungenerified {{Predicate}}, such that the
above example compiles with an unchecked warning.



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