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https://issues.apache.org/jira/browse/LUCENE-3836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13220105#comment-13220105
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Robert Muir commented on LUCENE-3836:
-------------------------------------
{quote}
(The reason I'm doing this at the codec level is that I wanted to avoid heavy
mods to SegmentReader, and it's easier to visualize how this data is re-mapped
and stacked at the level of fairly simple codec APIs).
{quote}
But SegmentReader is fairly simple these days, its just basically a pointer to
a core (SegmentCoreReaders) + deletes.
Maybe it should stay the same, but instead we could have a StackedReader
(perhaps a bad name), that points to multiple cores + deletes + mask files or
whatever it needs and returns masked enums over the underlying Enums itself
(e.g. combining enums from the underlying impls, passing masks down as Bits,
and such). SegmentReader would stay as-is.
> Most Codec.*Format().*Reader() methods should use SegmentReadState
> ------------------------------------------------------------------
>
> Key: LUCENE-3836
> URL: https://issues.apache.org/jira/browse/LUCENE-3836
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/codecs
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Fix For: 4.0
>
> Attachments: LUCENE-3836.patch
>
>
> Codec formats API for opening readers is inconsistent - sometimes it uses
> SegmentReadState, in other cases it uses individual arguments that are
> already available via SegmentReadState. This complicates extending the API,
> e.g. if additional per-segment state would need to be passed to the readers.
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