org.meresco.lucene.suggestion.ShingleAnalyzer.java Source code

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Here is the source code for org.meresco.lucene.suggestion.ShingleAnalyzer.java

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/* begin license *
 *
 * "Meresco Lucene" is a set of components and tools to integrate Lucene (based on PyLucene) into Meresco
 *
 * Copyright (C) 2015 Koninklijke Bibliotheek (KB) http://www.kb.nl
 * Copyright (C) 2015 Seecr (Seek You Too B.V.) http://seecr.nl
 *
 * This file is part of "Meresco Lucene"
 *
 * "Meresco Lucene" is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * "Meresco Lucene" is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with "Meresco Lucene"; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * end license */

package org.meresco.lucene.suggestion;

import java.io.Reader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.apache.lucene.analysis.shingle.ShingleFilter;
import org.apache.lucene.analysis.standard.StandardTokenizer;

class ShingleAnalyzer extends Analyzer {
    private int minShingleSize;
    private int maxShingleSize;

    public ShingleAnalyzer(int minShingleSize, int maxShingleSize) {
        this.minShingleSize = minShingleSize;
        this.maxShingleSize = maxShingleSize;
    }

    @Override
    protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
        Tokenizer source = new StandardTokenizer(reader);
        TokenStream src = new LowerCaseFilter(source);
        ShingleFilter filter = new ShingleFilter(src, this.minShingleSize, this.maxShingleSize);
        return new TokenStreamComponents(source, filter);
    }
}