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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1678) Deprecate Analyzer.tokenStream
Date Wed, 10 Jun 2009 11:14:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12718031#action_12718031
] 

Michael McCandless commented on LUCENE-1678:
--------------------------------------------

bq. So, given it is already broken, why not fix it the right way?

Because two wrongs don't make a right?

(I assume you're suggesting changing tokenStream to match reusableTokenStream, ie allowing
it to return a reused TokenStream between calls, and then deprecating reusableTokenStream).

Apps that get multiple TokenStreams from a single Analyzer and then iterate through them,
would silently break, if we up and made this 2nd non-back-compatible change.

> Deprecate Analyzer.tokenStream
> ------------------------------
>
>                 Key: LUCENE-1678
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1678
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.9
>
>
> The addition of reusableTokenStream to the core analyzers unfortunately broke back compat
of external subclasses:
>     http://www.nabble.com/Extending-StandardAnalyzer-considered-harmful-td23863822.html
> On upgrading, such subclasses would silently not be used anymore, since Lucene's indexing
invokes reusableTokenStream.
> I think we should should at least deprecate Analyzer.tokenStream, today, so that users
see deprecation warnings if their classes override this method.  But going forward when we
want to change the API of core classes that are extended, I think we have to  introduce entirely
new classes, to keep back compatibility.

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