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https://issues.apache.org/jira/browse/LUCENE-1216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12597036#action_12597036
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Hiroaki Kawai commented on LUCENE-1216:
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The reason of setWhitespaceDelimiter():
Of cource we can call addDelimiter(' '), but it is usually insufficient.
Whitespace chars we think, is described as:
- It is a Unicode space character (SPACE_SEPARATOR, LINE_SEPARATOR, or
PARAGRAPH_SEPARATOR)
but is not also a non-breaking space ('\u00A0', '\u2007', '\u202F').
- It is '\u0009', HORIZONTAL TABULATION.
- It is '\u000A', LINE FEED.
- It is '\u000B', VERTICAL TABULATION.
- It is '\u000C', FORM FEED.
- It is '\u000D', CARRIAGE RETURN.
- It is '\u001C', FILE SEPARATOR.
- It is '\u001D', GROUP SEPARATOR.
- It is '\u001E', RECORD SEPARATOR.
- It is '\u001F', UNIT SEPARATOR.
http://java.sun.com/javase/6/docs/api/java/lang/Character.html#isWhitespace(char)
I thought the white space chars are so many that it is hard to register each
time.
> CharDelimiterTokenizer
> ----------------------
>
> Key: LUCENE-1216
> URL: https://issues.apache.org/jira/browse/LUCENE-1216
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Hiroaki Kawai
> Assignee: Otis Gospodnetic
> Priority: Minor
> Attachments: CharDelimiterTokenizer.java,
> CharDelimiterTokenizer.java, TestCharDelimiterTokenizer.java
>
>
> WhitespaceTokenizer is very useful for space separated languages, but my
> Japanese text is not always separated by a space. So, I created an
> alternative Tokenizer that we can specify the delimiter. The file submitted
> will be an improvement of the current WhitespaceTokenizer.
> I tried to extend it from CharTokenizer, but CharTokenizer has a limitation
> that a token can't be longer than 255 chars.
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