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https://issues.apache.org/jira/browse/LUCENE-2183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12805992#action_12805992
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Uwe Schindler commented on LUCENE-2183:
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bq. we might want to insert a note/warning on the char-based methods,
consistent with the JDK javadocs, "Note this method cannot handle supplementary
characters..." for example, like:
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Character.html#getType%28char%29
I think its important to include the link to the JDK explanation of what a
supplementary character is, also.
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Character.html#supplementary
For that a link using javadoc {...@link Character#supplementary} would be good.
I will fix this here, as I already have the patcxh applied and will commit it
later.
bq. if possible we might want to include some class-level wordage on how the
whole thing works. If you implement the int-based API, you can use your class
with all Lucene Versions, and bw layer will make it work correctly with old
indexes. If you only stay with the char-based API, then you can only use your
CharTokenizer for Version <= 3.0. We can also mention it is unnecessary to
implement both, only the int-based api!!!
++++++1. The old TokenStream API had a check for these problems, right?
> Supplementary Character Handling in CharTokenizer
> -------------------------------------------------
>
> Key: LUCENE-2183
> URL: https://issues.apache.org/jira/browse/LUCENE-2183
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Simon Willnauer
> Assignee: Uwe Schindler
> Fix For: 3.1
>
> Attachments: LUCENE-2183.patch, LUCENE-2183.patch, LUCENE-2183.patch,
> LUCENE-2183.patch, LUCENE-2183.patch
>
>
> CharTokenizer is an abstract base class for all Tokenizers operating on a
> character level. Yet, those tokenizers still use char primitives instead of
> int codepoints. CharTokenizer should operate on codepoints and preserve bw
> compatibility.
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