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https://issues.apache.org/jira/browse/LUCENE-3084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032271#comment-13032271
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Simon Willnauer commented on LUCENE-3084:
-----------------------------------------

bq. Let's stop subclassing random things? : ) SIS can contain a List of SIs 
(and maybe a Set, or whatever we need in the future), and only expose 
operations its clients really need
+1 we should if at all implement Iterable<SegmentInfo> instead of vector or 
arraylist.

bq. I would love to cutover to Set<SI>, but, I don't think we can. There are 
apps out there that want merges to remain contiguous (so docIDs keep their 
monotonicity).

I think this should be feasible with a sorted set? It might make sense is the 
SIS case to hold a NavigableSet and I personally would prever that much over 
subclassing some random collection. If we refactor this we should refactor 
towards an interface not an implementation.

> MergePolicy.OneMerge.segments should be List<SegmentInfo> not SegmentInfos
> --------------------------------------------------------------------------
>
>                 Key: LUCENE-3084
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3084
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.2, 4.0
>
>         Attachments: LUCENE-3084-trunk-only.patch, 
> LUCENE-3084-trunk-only.patch, LUCENE-3084.patch
>
>
> SegmentInfos carries a bunch of fields beyond the list of SI, but for merging 
> purposes these fields are unused.
> We should cutover to List<SI> instead.

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