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https://issues.apache.org/jira/browse/LUCENE-3392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089415#comment-13089415
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Olivier Favre commented on LUCENE-3392:
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The proposed implementation may a have tight bond with the JVM implementation
of some classes (StringReader, BufferedReader and FilterReader), as they rely
on a named private field (respectively "str", "in" and "in").
This can be avoided, but any Reader should then be fully read and stored as a
String or a char[], which can have a huge overhead.
Considering each clone would get read relatively at the same speed (well, only
for word delimiting analysis, not for a KeywordAnalyzer) an implementation
could only retain in memory the portion read by at least one cloned reader but
not all clones, in order to implement a "multi read head" reader.
Another implementation would be to change the API to give a CloneableReader
interface with a "giveAClone()" function instead of a Reader for tokenStream
and reusableTokenStream functions.
But this involves massive refactoring (>13,000 lines) and introduces an
important API break.
The proposed implementation is the best solution I found.
Any suggestions are welcome!
> Combining analyzers output
> --------------------------
>
> Key: LUCENE-3392
> URL: https://issues.apache.org/jira/browse/LUCENE-3392
> Project: Lucene - Java
> Issue Type: New Feature
> Reporter: Olivier Favre
> Priority: Minor
> Labels: analysis
> Fix For: 3.4
>
> Attachments: ComboAnalyzer-lucene3x.patch
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> It should be easy to combine the output of multiple Analyzers, or
> TokenStreams.
> A ComboAnalyzer and a ComboTokenStream class would take multiple instances,
> and multiplex their output, keeping a rough order of tokens like increasing
> position then increasing start offset then increasing end offset.
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