Grant Ingersoll wrote:
What's your current chain of TokenFilters? How many exceptions do you expect?
That is, could you enumerate them?
Very few, yes I could enumerate them, but not sure what exactly you are
suggesting, what I was going to do would be add to the charConvertMap
(when I posted I thought this was only for individual chars not strings)
This is my analyzer:
package org.musicbrainz.search.analysis;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.CharFilter;
import org.apache.lucene.analysis.MappingCharFilter;
import org.apache.lucene.analysis.NormalizeCharMap;
import java.io.IOException;
import java.io.Reader;
import com.ibm.icu.text.Transliterator;
import org.apache.lucene.util.Version;
import org.musicbrainz.search.LuceneVersion;
/**
* Filters StandardTokenizer with StandardFilter, ICUTransformFilter,
AccentFilter, LowerCaseFilter
* and no stop words.
*/
public class StandardUnaccentAnalyzer extends Analyzer {
private NormalizeCharMap charConvertMap;
private void setCharConvertMap() {
charConvertMap = new NormalizeCharMap();
charConvertMap.add("&","and");
//Hebrew chars converted to western cases so matches both
charConvertMap.add("\u05f3","'");
charConvertMap.add("\u05be","-");
charConvertMap.add("\u05f4","\"");
}
public StandardUnaccentAnalyzer() {
setCharConvertMap();
}
public TokenStream tokenStream(String fieldName, Reader reader) {
CharFilter mappingCharFilter = new MappingCharFilter(charConvertMap,reader);
StandardTokenizer tokenStream = new
StandardTokenizer(LuceneVersion.LUCENE_VERSION, mappingCharFilter);
TokenStream result = new ICUTransformFilter(tokenStream,
Transliterator.getInstance("[ー[:Script=Katakana:]]Katakana-Hiragana"));
result = new ICUTransformFilter(result,
Transliterator.getInstance("Traditional-Simplified"));
result = new StandardFilter(result);
result = new AccentFilter(result);
result = new LowercaseFilter(result);
return result;
}
private static final class SavedStreams {
StandardTokenizer tokenStream;
TokenStream filteredTokenStream;
}
public TokenStream reusableTokenStream(String fieldName, Reader reader)
throws IOException {
SavedStreams streams = (SavedStreams)getPreviousTokenStream();
if (streams == null) {
streams = new SavedStreams();
setPreviousTokenStream(streams);
streams.tokenStream = new
StandardTokenizer(LuceneVersion.LUCENE_VERSION, new
MappingCharFilter(charConvertMap, reader));
streams.filteredTokenStream = new
ICUTransformFilter(streams.tokenStream, Transliterator.getInstance("[ー
[:Script=Katakana:]]Katakana-Hiragana"));
streams.filteredTokenStream = new
ICUTransformFilter(streams.filteredTokenStream,
Transliterator.getInstance("Traditional-Simplified"));
streams.filteredTokenStream = new
StandardFilter(streams.filteredTokenStream);
streams.filteredTokenStream = new AccentFilter(streams.filteredTokenStream);
streams.filteredTokenStream = new
LowercaseFilter(streams.filteredTokenStream);
}
else {
streams.tokenStream.reset(new MappingCharFilter(charConvertMap,reader));
}
return streams.filteredTokenStream;
}
}
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