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From "Branimir Lambov (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Created: (UIMA-1363) Access to individual type index iterators
Date Tue, 02 Jun 2009 13:02:07 GMT
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


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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