org.elasticsearch.index.analysis.NGram.NGramAnalyzer.java Source code

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Here is the source code for org.elasticsearch.index.analysis.NGram.NGramAnalyzer.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Author: dong ai hua <dongaihua1201@nhn.com>
 */

package org.elasticsearch.index.analysis.NGram;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ngram.NGramTokenFilter;
import org.apache.lucene.analysis.standard.StandardTokenizer;
import org.apache.lucene.util.Version;

import java.io.Reader;

public final class NGramAnalyzer extends Analyzer {

    public static final int DEFAULT_MAX_TOKEN_LENGTH = 255;

    private int maxTokenLength = DEFAULT_MAX_TOKEN_LENGTH;

    public void setMaxTokenLength(int length) {
        maxTokenLength = length;
    }

    public int getMaxTokenLength() {
        return maxTokenLength;
    }

    @Override
    protected Analyzer.TokenStreamComponents createComponents(String fieldName, Reader reader) {
        final StandardTokenizer source = new StandardTokenizer(Version.LUCENE_43, reader);
        source.setMaxTokenLength(maxTokenLength);
        TokenStream result = new NGramTokenFilter(source, 3, 10);
        return new Analyzer.TokenStreamComponents(source, result);
    }
}