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https://issues.apache.org/jira/browse/LUCENE-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842509#action_12842509
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Michael McCandless commented on LUCENE-2302:
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I like that this change would mean indexer has a single getBytes interface for
getting the terms data.
It'd mean the UTF16->UTF8 encoding it now does would move into CharTermAttr,
hidden to the indexer.
So the indexer only ever works with opaque byte[] data for terms.
And it'd mean others can make their own term attrs -- maybe my terms are shorts
and I send 2 bytes to indexer per term.
> Replacement for TermAttribute+Impl with extended capabilities (byte[]
> support, CharSequence, Appendable)
> --------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2302
> URL: https://issues.apache.org/jira/browse/LUCENE-2302
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Affects Versions: Flex Branch
> Reporter: Uwe Schindler
> Fix For: Flex Branch
>
>
> For flexible indexing terms can be simple byte[] arrays, while the current
> TermAttribute only supports char[]. This is fine for plain text, but e.g
> NumericTokenStream should directly work on the byte[] array.
> Also TermAttribute lacks of some interfaces that would make it simplier for
> users to work with them: Appendable and CharSequence
> I propose to create a new interface "CharTermAttribute" with a clean new API
> that concentrates on CharSequence and Appendable.
> The implementation class will simply support the old and new interface
> working on the same term buffer. DEFAULT_ATTRIBUTE_FACTORY will take care of
> this. So if somebody adds a TermAttribute, he will get an implementation
> class that can be also used as CharTermAttribute. As both attributes create
> the same impl instance both calls to addAttribute are equal. So a TokenFilter
> that adds CharTermAttribute to the source will work with the same instance as
> the Tokenizer that requested the (deprecated) TermAttribute.
> To also support byte[] only terms like Collation or NumericField needs, a
> separate getter-only interface will be added, that returns a reusable
> BytesRef, e.g. BytesRefGetterAttribute. The default implementation class will
> also support this interface. For backwards compatibility with old
> self-made-TermAttribute implementations, the indexer will check with
> hasAttribute(), if the BytesRef getter interface is there and if not will
> wrap a old-style TermAttribute (a deprecated wrapper class will be provided):
> new BytesRefGetterAttributeWrapper(TermAttribute), that is used by the
> indexer then.
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