Unicode Text Normalization(n11n) Filter for Solr.

This filter works as CharFilter.
Make jar file from sources and deploy to solr.

Requirements:
Solr 1.4 lib files.

Usage:
Insert jp.thinq.solr.normalization.NormalizeCharFilterFactory
as CharFilter.
This filter can have 'norm' parameter used for normalization form.
It can accepts one of some values below:
nfc: java.text.Normalizer.Form.NFC
nfd: java.text.Normalizer.Form.NFD
nfkc: java.text.Normalizer.Form.NFKC (default)
nfkd: java.text.Normalizer.Form.NFKD

e.g.)
schema.xml:
  <types>
  ...
   <fieldType name="text" class="solr.TextField">
      <analyzer>
        <charFilter class="solr.HTMLStripCharFilterFactory"/>
        <charFilter class="jp.thinq.solr.normalization.NormalizeCharFilterFactory" norm="nfkc"/>
        <tokenizer class="solr.CJKTokenizerFactory"/>
      </analyzer>
    </fieldType>
  ...
  </types>

Bugs:
Only nfkc normalization is tested. :-)
This filter reads all characters before processing. It can cause large memory usage.
Streaming reading is planned...

Author: Shinsaku C. <chsh@thinq.jp>
Licence: MIT.