org.apache.solr.analysis.EdgeNGramFilterFactory 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 java.util.Map;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ngram.EdgeNGramTokenFilter;

/**
 * Creates new instances of {@link EdgeNGramTokenFilter}.
 */
public class EdgeNGramFilterFactory extends BaseTokenFilterFactory {
  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)
        : EdgeNGramTokenFilter.DEFAULT_MAX_GRAM_SIZE);

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

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

  public EdgeNGramTokenFilter create(TokenStream input) {
    return new EdgeNGramTokenFilter(input, side, minGramSize, maxGramSize);
  }
}