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https://issues.apache.org/jira/browse/LUCENE-4343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444908#comment-13444908
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Chris Male commented on LUCENE-4343:
------------------------------------

+1 to the improvements and pursuing making it final.
                
> Clear up more Tokenizer.setReader/TokenStream.reset issues
> ----------------------------------------------------------
>
>                 Key: LUCENE-4343
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4343
>             Project: Lucene - Core
>          Issue Type: Task
>          Components: modules/analysis
>            Reporter: Robert Muir
>         Attachments: LUCENE-4343.patch
>
>
> spinoff from user-list thread.
> I think the rename helps, but the javadocs still have problems: they seem to 
> only describe a totally wacky case (CachingTokenFilter) and not the normal 
> case.
> Ideally setReader would be final I think, but there are a few crazy 
> tokenstreams to fix before I could make that work. Would also need something 
> hackish so MockTokenizer's state machine is still functional.
> But i worked on fixing up the mess in our various tokenstreams, which is easy 
> for the most part.
> As part of this I found it was really useful in flushing out test bugs (ones 
> that dont use MockTokenizer, which they really should), if we can do some 
> best-effort exceptions when the consumer is broken and it costs nothing.
> For example:
> {noformat}
> -  private int offset = 0, bufferIndex = 0, dataLen = 0, finalOffset = 0;
> +  // note: bufferIndex is -1 here to best-effort AIOOBE consumers that don't 
> call reset()
> +  private int offset = 0, bufferIndex = -1, dataLen = 0, finalOffset = 0;
> {noformat}
> I think this is worth exploring more... this was really effective at finding 
> broken tests etc. We should see if we can be more thorough/ideally throw 
> better exceptions when consumers are broken and its free.

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