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https://issues.apache.org/jira/browse/LUCENE-2084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794637#action_12794637
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Robert Muir commented on LUCENE-2084:
-------------------------------------

Uwe, another thing is that currently the indexablebinarystringcode requires 
that the buffer have a backing array, which is optional.

one idea is that if we implement the code with byte[]/char[] as this patch 
does, perhaps we can make the buffer code (which is just helper methods around 
this) to remove this restriction

after all, now we have a benchmark so we can measure this and make sure it does 
not hurt performance for the charbuffer/bytebuffer case,  although with this 
patch these buffer methods are not used by any collation filters.

> remove Byte/CharBuffer wrapping for collation key generation
> ------------------------------------------------------------
>
>                 Key: LUCENE-2084
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2084
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/*
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: collation.benchmark.tar.bz2, LUCENE-2084.patch, 
> LUCENE-2084.patch, TopTFWikipediaWords.tar.bz2
>
>
> We can remove the overhead of ByteBuffer and CharBuffer wrapping in 
> CollationKeyFilter and ICUCollationKeyFilter.
> this patch moves the logic in IndexableBinaryStringTools into char[],int,int 
> and byte[],int,int based methods, with the previous Byte/CharBuffer methods 
> delegating to these.
> Previously, the Byte/CharBuffer methods required a backing array anyway.

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