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https://issues.apache.org/jira/browse/LUCENE-4285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427435#comment-13427435
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David Smiley commented on LUCENE-4285:
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Keep in mind, from an FST outsider like me, *FSTs are basically a fancy
SortedMap*. Yet Lucene's FST API is so complicated that there is a dedicated
package of classes, and I need to understand a fair amount of it. I'm not
saying the package should go away or just one class is realistic, just that
conceptually for outsiders it can and should be simpler than it is.
The Util.get* methods should have instance methods on the FST. I shouldn't
need to look at Util, I think.
The BytesReader concept is confusing and should be hidden.
Outputs... this aspect of the API is over-exposed; maybe it can be hidden more?
I know I need to choose an implementation at construction.
FSTEnum is pretty cool, and improving it or creating variants of it could help
to simply using the overall API. The FST should have a getter for it. It
would be nice if FSTEnum could advance to the next arc by a label (I need
this). It would be something like next(int). Can it be improved to the point
where, for example, SynonymFilter can use it? It would be nice to reduce the
use-cases where users/client-code don't have to even see an Arc.
> Improve FST API usability for mere mortals
> ------------------------------------------
>
> Key: LUCENE-4285
> URL: https://issues.apache.org/jira/browse/LUCENE-4285
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/FSTs
> Reporter: David Smiley
>
> FST technology is something that has brought amazing advances to Lucene, yet
> the API is hard to use for the vast majority of users like me. I know that
> performance of FSTs is really important, but surely a lot can be done without
> sacrificing that.
> (comments will hold specific ideas and problems)
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