[jira] [Resolved] (UIMA-5845) Inconsistent behavior on going beyond index limits in SelectFS

["Marshall Schor (JIRA)" <de...@uima.apache.org>]

     [ https://issues.apache.org/jira/browse/UIMA-5845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marshall Schor resolved UIMA-5845.
----------------------------------
    Resolution: Fixed

This was apparently fixed in 3.0.1SDK, but was not closed.

> Inconsistent behavior on going beyond index limits in SelectFS
> --------------------------------------------------------------
>
>                 Key: UIMA-5845
>                 URL: https://issues.apache.org/jira/browse/UIMA-5845
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>    Affects Versions: 3.0.0SDK
>            Reporter: Richard Eckart de Castilho
>            Priority: Major
>             Fix For: 3.0.1SDK
>
>
> The behavior of trying to address annotations outside the index appears to be inconsistent.
> For example, the following call returns `null`:
> {code}
>     String text = "one two three";
>     tokenBuilder.buildTokens(jCas, text);
>     List<Token> tokens = new ArrayList<Token>(select(jCas, Token.class));
>     
>     for (Token token : tokens) {
>       new AnalyzedText(jCas, token.getBegin(), token.getEnd()).addToIndexes();
>     }    
>     
>     Token firstToken = tokens.get(0);
>     AnalyzedText x = jCas.select(AnalyzedText.class).preceding(firstToken, 0).get();
> {code}
> However, this code trying go from the end of the index to before the first item throws a CASRuntime exception:
> {code}
>     String text = "Rot wood cheeses dew?";
>     tokenBuilder.buildTokens(jCas, text);
>     assertThatExceptionOfType(CASRuntimeException.class)
>         .isThrownBy(() -> jCas.select(Token.class).backwards().get(4))
>         .withMessage("CAS does not contain any '" + Token.class.getName() + "' instances  shifted by: 4.");
> {code}
> It would seem reasonably to either always return null or to always thrown an exception. If an exception is thrown, it would seem reasonable to introduce a subtype of the CASRuntimeException, e.g. a CASIndexOutOfBounds exception or something the likes. CASRuntimeException seems very general.



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