[jira] Updated: (SOLR-319) changes SynonymFilterFactory for N-gram tokenizer

["Koji Sekiguchi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Koji Sekiguchi updated SOLR-319:
--------------------------------

    Attachment:     (was: SOLR-319-UTF-8.patch)

> changes SynonymFilterFactory for N-gram tokenizer
> -------------------------------------------------
>
>                 Key: SOLR-319
>                 URL: https://issues.apache.org/jira/browse/SOLR-319
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Koji Sekiguchi
>            Priority: Minor
>
> WHAT:
> Currently, SynonymFilterFactory works very well with N-gram tokenizer (CJKTokenizer, for example).
> But we have to take care of the statement in synonyms.txt.
> For example, if I use CJKTokenizer (work as bi-gram for CJK chars) and want C1C2C3 maps to C4C5C6,
> I have to write the rule as follows:
> C1C2 C2C3 => C4C5 C5C6
> But I want to write it "C1C2C3=>C4C5C6". This patch allows it. It is also helpful for sharing synonyms.txt.
> HOW:
> tokenFactory attribute is added to <filter class="solr.SynonymFilterFactory"/>.
> If the attribute is specified, SynonymFilterFactory uses the TokenizerFactory to create Tokenizer.
> Then SynonymFilterFactory uses the Tokenizer to get tokens from the rules in synonyms.txt file.
> sample-1: CJKTokenizer
>     <fieldtype name="text_cjk" class="solr.TextField" positionIncrementGap="100">
>       <analyzer type="index">
>         <tokenizer class="solr.CJKTokenizerFactory"/>
>         <filter class="solr.SynonymFilterFactory" synonyms="ngram_synonym_test_ja.txt"
>         		ignoreCase="true" expand="true" tokenFactory="solr.CJKTokenizerFactory"/>
>         <filter class="solr.LowerCaseFilterFactory"/>
>       </analyzer>
>       <analyzer type="query">
>         <tokenizer class="solr.CJKTokenizerFactory"/>
>         <filter class="solr.LowerCaseFilterFactory"/>
>       </analyzer>
>     </fieldtype>
> sample-2: NGramTokenizer
>     <fieldtype name="text_ngram" class="solr.TextField" positionIncrementGap="100">
>       <analyzer type="index">
>         <tokenizer class="solr.NGramTokenizerFactory" minGramSize="2" maxGramSize="2"/>
>         <filter class="solr.LowerCaseFilterFactory"/>
>       </analyzer>
>       <analyzer type="query">
>         <tokenizer class="solr.NGramTokenizerFactory" minGramSize="2" maxGramSize="2"/>
>         <filter class="solr.SynonymFilterFactory" synonyms="ngram_synonym_test_ngram.txt"
>         		ignoreCase="true" expand="true"
>         		tokenFactory="solr.NGramTokenizerFactory" minGramSize="2" maxGramSize="2"/>
>         <filter class="solr.LowerCaseFilterFactory"/>
>       </analyzer>
>     </fieldtype>
> backward compatibility:
> Yes. If you omit tokenFactory attribute from <filter class="solr.SynonymFilterFactory"/> tag, it works as usual.

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