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https://issues.apache.org/jira/browse/UIMA-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Branimir Lambov updated UIMA-1363:
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Attachment: LeafIteratorPatch.txt
ll_leafIterator() implementation.
> Access to individual type index iterators
> -----------------------------------------
>
> Key: UIMA-1363
> URL: https://issues.apache.org/jira/browse/UIMA-1363
> Project: UIMA
> Issue Type: Improvement
> Components: Core Java Framework
> Environment: Windows XP, LanguageWare
> Reporter: Branimir Lambov
> Attachments: LeafIteratorPatch.txt
>
>
> UIMA feature structure iterators for a given type always include its
> subtypes. While this is generally the best thing to do, if an application
> requires more precise control over the types it needs an ability to iterate
> over the instances of a specific type only, leaving the subtypes out. In the
> current UIMA this is not possible to achieve.
> This is especially important for performance as iterating over an aggregate
> index is vastly more complicated than listing an individual index. In certain
> real-world scenarios using our AFST engine we are able to achieve close to
> 20% performance improvement on complete processing pipelines by simply giving
> the AFST type set iterator access to individual type iterators.
> The attached patch implements a new "ll_leafIterator()" method in
> LowLevelIndex which returns an iterator over the root type of an index. It
> also includes a simple alternative to FSIndexRepositoryImpl.PointerIterator
> for leaf types, also improving the performance when iterating over leaf types.
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