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*
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/*
* Copyright (c) 2006, 2014, Oracle and/or its affiliates. All rights reserved.
*/
package org.opensolaris.opengrok.analysis;
import java.io.Reader;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.core.StopFilter;
import org.apache.lucene.analysis.util.CharArraySet;
import org.opensolaris.opengrok.analysis.plain.PlainFullTokenizer;
public final class HistoryAnalyzer extends Analyzer {
private final CharArraySet stopWords;
/**
* An array containing some common English words that are not usually useful
* for searching.
*/
private static final String[] ENGLISH_STOP_WORDS = {
"a", "an", "and", "are", "as", "at", "be", "but", "by",
"for", "if", "in", "into", "is", "it",
"no", "not", "of", "on", "or", "s", "such",
"t", "that", "the", "their", "then", "there", "these",
"they", "this", "to", "was", "will", "with",
"/", "\\", ":", ".", "0.0", "1.0"
};
/**
* Builds an analyzer which removes words in ENGLISH_STOP_WORDS.
*/
public HistoryAnalyzer() {
super(Analyzer.PER_FIELD_REUSE_STRATEGY);
stopWords = StopFilter.makeStopSet(ENGLISH_STOP_WORDS);
}
/**
* Filters LowerCaseTokenizer with StopFilter.
* @param fieldName name of field for which to create components
* @param reader from which to read data
* @return components for this analyzer
*/
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
final PlainFullTokenizer plainfull = new PlainFullTokenizer(reader);
//we are counting position increments, this might affect the queries later and need to be in sync, especially for highlighting of results
return new TokenStreamComponents(plainfull, new StopFilter(plainfull, stopWords));
}
}