46 lines
1.3 KiB
Java
46 lines
1.3 KiB
Java
package it.cavallium.dbengine.lucene.analyzer;
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import it.cavallium.dbengine.lucene.LuceneUtils;
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import org.apache.lucene.analysis.Analyzer;
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import org.apache.lucene.analysis.TokenStream;
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import org.apache.lucene.analysis.Tokenizer;
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import org.apache.lucene.analysis.core.KeywordTokenizer;
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import org.apache.lucene.analysis.ngram.NGramTokenFilter;
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import org.apache.lucene.analysis.standard.StandardTokenizer;
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public class NCharGramAnalyzer extends Analyzer {
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private final boolean words;
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private final int minGram;
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private final int maxGram;
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public NCharGramAnalyzer(boolean words, int minGram, int maxGram) {
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this.words = words;
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this.minGram = minGram;
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this.maxGram = maxGram;
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}
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@Override
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protected TokenStreamComponents createComponents(final String fieldName) {
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Tokenizer tokenizer;
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TokenStream tokenStream;
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if (words) {
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tokenizer = new StandardTokenizer();
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} else {
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tokenizer = new KeywordTokenizer();
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}
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tokenStream = tokenizer;
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tokenStream = LuceneUtils.newCommonFilter(tokenStream, words);
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tokenStream = new NGramTokenFilter(tokenStream, minGram, maxGram, false);
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return new TokenStreamComponents(tokenizer, tokenStream);
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}
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@Override
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protected TokenStream normalize(String fieldName, TokenStream in) {
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TokenStream tokenStream = in;
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tokenStream = LuceneUtils.newCommonNormalizer(tokenStream);
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return tokenStream;
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}
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}
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