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From "Yonik Seeley (JIRA)" <>
Subject [jira] Commented: (LUCENE-1137) Token type as BitSet: typeBits()
Date Wed, 16 Jan 2008 17:03:34 GMT


Yonik Seeley commented on LUCENE-1137:

Gack!  I recommended a bitset on Token previously, but I meant an elemental one... an int
(32 bits) or a long (64 bits).
Half of the bits could be reserved for use by Lucene tokenizers, and half could be reserved
for users.  I think an actual BitSet is too heavy-weight.

Just provide a int or long Token.getFlags() and int or long Token.setFlags(), and nothing
more (we don't need to do bit twiddling for users IMO)

> Token type as BitSet: typeBits()
> --------------------------------
>                 Key: LUCENE-1137
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Analysis
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 2.4
>         Attachments: LUCENE-1137.patch
> It is sometimes useful to have a more compact, easy to parse, type representation for
Token than the current type() String.  This patch adds a BitSet onto Token, defaulting to
null, with accessors for setting bit flags on a Token.  This is useful for communicating information
about a token to TokenFilters further down the chain.  
> For example, in the WikipediaTokenizer, the possibility exists that a token could be
both a category and bold (or many other variations), yet it is difficult to communicate this
without adding in a lot of different Strings for type.  Unlike using the payload information
(which could serve this purpose), the BitSet does not get added to the index (although one
could easily convert it to a payload.)

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