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https://issues.apache.org/jira/browse/LUCENE-1804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742385#action_12742385
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Uwe Schindler commented on LUCENE-1804:
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OK, I was wondering, because TokenFilter is there for this pupose and 
TokenStream only provides the AttributeSource ctor because the TokenFilter 
subclass needs this. So one could also simply create a TokenFilter and put it 
ontop of the Tokenizer to wrap? new TokenFilter(new WrappedTokenizer())  - why 
need a Tokenizer for that when TokenFilter is made for it?

But for completeness, this ctor should also get the Reader/CharStream (as all 
other ctors have the Reader param).

> Can't specify AttributeSource for Tokenizer
> -------------------------------------------
>
>                 Key: LUCENE-1804
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1804
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Yonik Seeley
>         Attachments: LUCENE-1804.patch
>
>
> One can't currently specify the attribute source for a Tokenizer like one can 
> with any other TokenStream.

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