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https://issues.apache.org/jira/browse/LUCENE-1906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753722#action_12753722
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Robert Muir commented on LUCENE-1906:
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bq. Correct, this is always the problem with this change. The offsets are wrong
if one legacy Tokenizer does not correct the offset (either through
Tokenizer.correctOffset() or CharStream.correctOffset()).
right, so your proposed fix would correct this issue (the back compat break),
but it doesn't introduce any new issue.
if you want to use CharFilter, then your tokenizer must call correctOffset() so
the offsets will be correct.
> Problem 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.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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