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Date: Thu, 10 Sep 2009 23:16:57 -0700 (PDT)
From: "Uwe Schindler (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Resolved: (LUCENE-1906) Backwards problems with CharStream
 and Tokenizers with custom reset(Reader) method
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     [ https://issues.apache.org/jira/browse/LUCENE-1906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uwe Schindler resolved LUCENE-1906.
-----------------------------------

    Resolution: Fixed

Committed revision: 813671

There may be some changes needed in Solr (correctOffset in Tokenizer / CharStream->Reader), should I open an issue?

> Backwards problems with CharStream and Tokenizers with custom reset(Reader) method
> ----------------------------------------------------------------------------------
>
>                 Key: LUCENE-1906
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1906
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>    Affects Versions: 2.9
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>            Priority: Blocker
>             Fix For: 2.9
>
>         Attachments: backwards-break.patch, LUCENE-1906-bw.patch, LUCENE-1906.patch, LUCENE-1906.patch, LUCENE-1906.patch, LUCENE-1906.patch, LUCENE-1906_contrib.patch
>
>
> When reviewing the new CharStream code added to Tokenizers, I found a
> serious problem with backwards compatibility and other Tokenizers, that do
> not override reset(CharStream).
> The problem is, that e.g. CharTokenizer only overrides reset(Reader):
> {code}
>   public void reset(Reader input) throws IOException {
>     super.reset(input);
>     bufferIndex = 0;
>     offset = 0;
>     dataLen = 0;
>   }
> {code}
> If you reset such a Tokenizer with another CharStream (not a Reader), this
> method will never be called and breaking the whole Tokenizer.
> As CharStream extends Reader, I propose to remove this reset(CharStream
> method) and simply do an instanceof check to detect if the supplied Reader
> is no CharStream and wrap it. We could also remove the extra ctor (because
> most Tokenizers have no support for passing CharStreams). If the ctor also
> checks with instanceof and warps as needed the code is backwards compatible
> and we do not need to add additional ctors in subclasses.
> As this instanceof check is always done in CharReader.get() why not remove
> ctor(CharStream) and reset(CharStream) completely?
> Any thoughts?
> I would like to fix this somehow before RC4, I'm, sorry :(

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