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From "Marshall Schor (JIRA)" <...@uima.apache.org>
Subject [jira] [Commented] (UIMA-5536) uv3 remove positionUsesType from select api
Date Fri, 01 Sep 2017 18:17:00 GMT

    [ https://issues.apache.org/jira/browse/UIMA-5536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16150960#comment-16150960

Marshall Schor commented on UIMA-5536:

went back to the original v2 implementation, for backwards compatibility.  Removed this from
select apis.  

> uv3 remove positionUsesType from select api
> -------------------------------------------
>                 Key: UIMA-5536
>                 URL: https://issues.apache.org/jira/browse/UIMA-5536
>             Project: UIMA
>          Issue Type: Bug
>    Affects Versions: 3.0.0SDK-alpha02
>            Reporter: Marshall Schor
>            Assignee: Marshall Schor
>             Fix For: 3.0.0SDK-beta
> The select API attempts to combine some of uimaFIT's capability for iterating.  The design
included a configuration choice "positionUsesType".  This was implemented incorrectly for
some cases, and it seems it would be hard to fix.  This Jira suggests removing it altogether.
> What it does: It affects two bits of iterator operation:
> # moveTo(fs) - move to the leftmost item that "matches" fs
> # for bounded iterators: skip the item which is "equal" to the bound.
> Details: The "matches" in 1) is based on the comparator for the index.  For Annotation
indexes, this includes the typePriority.  However, the select API framework by default doesn't
use type priorities (can be configured though). This means, if the underlying iterator is
using type priorities, then doing a moveTo on it will move to a spot which might not be the
"left-most" when type priorities are not used.  The correction for this has two flavors: depending
on the setting of positionUsesType.  If not specified, the correction worked, and moved to
the left-most same-begin-end-ignoring-type.  If specified, the correction was ignoring this,
and a fix would need to scan in both directions to find the right type.  Although this could
be done, it's complex.  And I think this is designing beyond a real need.  
> Use 2 is for skipping the bounding annotation when iterating (if it is in the index).
 The normal mode for skipping is to skip only the item if it is == identical to the bounding
annotation.  But (for UIMA v2 bounded iterator compatibility) a mode where the compare is
done using the Annotation Comparator is provided.  The positionUsesType would narrow this
equal test by also requiring that the types match.  I think this is unnecessarily complex,
since I think most uses will be using the == style.
> So I propose to remove positionUsesType from the implementation / documentation.

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