org.apache.solr.analysis.EdgeNGramTokenizerFactory Maven / Gradle / Ivy

package org.apache.solr.analysis;

/**
 * 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.
 */

import org.apache.lucene.analysis.ngram.EdgeNGramTokenizer;

import java.io.Reader;
import java.util.Map;

/**
 * Creates new instances of {@link EdgeNGramTokenizer}.
 */
public class EdgeNGramTokenizerFactory extends BaseTokenizerFactory {
    private int maxGramSize = 0;

    private int minGramSize = 0;

    private String side;

    @Override
    public void init(Map args) {
        super.init(args);
        String maxArg = args.get("maxGramSize");
        maxGramSize = (maxArg != null ? Integer.parseInt(maxArg) : EdgeNGramTokenizer.DEFAULT_MAX_GRAM_SIZE);

        String minArg = args.get("minGramSize");
        minGramSize = (minArg != null ? Integer.parseInt(minArg) : EdgeNGramTokenizer.DEFAULT_MIN_GRAM_SIZE);

        side = args.get("side");
        if (side == null) {
            side = EdgeNGramTokenizer.Side.FRONT.getLabel();
        }
    }

    public EdgeNGramTokenizer create(Reader input) {
        return new EdgeNGramTokenizer(input, side, minGramSize, maxGramSize);
    }
}