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https://issues.apache.org/jira/browse/LUCENE-1849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12746907#action_12746907
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Tim Smith commented on LUCENE-1849:
-----------------------------------

They would be convenience classes for people implementing their own Collectors 
(as i am)

just kinda a pain (and bloats amount of required code by about 5 lines) to have 
to always implement this method (when it could be inherited easily from a 
parent class)

Just throwing this out as an idea to see if anyone else likes it (thats why i 
marked it as a _Wish_)

> Add OutOfOrderCollector and InOrderCollector subclasses of Collector
> --------------------------------------------------------------------
>
>                 Key: LUCENE-1849
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1849
>             Project: Lucene - Java
>          Issue Type: Wish
>          Components: Search
>    Affects Versions: 2.9
>            Reporter: Tim Smith
>            Priority: Minor
>             Fix For: 2.9
>
>
> I find myself always having to implement these methods, and i always return a 
> constant (depending on if the collector can handle out of order hits)
> would be nice for these two convenience abstract classes to exist that 
> implemented acceptsDocsOutOfOrder() as final and returned the appropriate 
> value

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