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From "Richard Eckart de Castilho (JIRA)" <...@uima.apache.org>
Subject [jira] [Commented] (UIMA-1524) JFSIndexRepository should be enhanced with new generic methods
Date Mon, 12 Sep 2016 22:40:20 GMT

    [ https://issues.apache.org/jira/browse/UIMA-1524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15485510#comment-15485510

Richard Eckart de Castilho commented on UIMA-1524:

I am a bit torn between the static methods and methods on CAS. Actually, I like the static
methods, but they require a static import. No problem for me because I have added e.g. uimaFIT
JCasUtil to the suggestion list for static methods in Eclipse, but that's an extra action
to do. Also, there is a potential clash for static imports if static methods for CAS and JCas
are defined in separate classes as it is presently the case with CasUtil and JCasUtil. 

That said, in some cases, the CAS can (and probably even should) be inferred from the context
annotation - or if not different code would probably need to be executed depending on whether
the selection happens on the same CAS (view) or on a different one. E.g. within the same view,
an index can be used to speed up the lookup, but cross-CAS, a index scan matching on offsets
might be required. For situations where the CAS is inferred from the FS, a static method or
possibly even a method on the features structure itself would be nice, e.g.

cas.select(Token.class).map( t -> t.selectCovering(Sentence.class));

Btw. JCasUtil and CasUtil also offer static select methods that operate on FSList and FSArray
instead of CAS. I also found these quite convenient occasionally for type-safe access to multi-valued
features. Would be nice if we could also bring those across - either again as static methods
or as methods on FSArray/FSList or maybe both.

> JFSIndexRepository should be enhanced with new generic methods
> --------------------------------------------------------------
>                 Key: UIMA-1524
>                 URL: https://issues.apache.org/jira/browse/UIMA-1524
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Core Java Framework
>    Affects Versions: 2.3
>            Reporter: Joern Kottmann
> Existing methods should be overloaded with an additional Class argument to specify the
exact return type. This changes make down casting of returned objects unnecessary. 

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