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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.NGramTokenFilter;

/**
 * Creates new instances of {@link NGramTokenFilter}.
 */
public class NGramFilterFactory extends BaseTokenFilterFactory {
  private int maxGramSize = 0;

  private int minGramSize = 0;

  /** Initialize the n-gram min and max sizes and the side from which one should start tokenizing. */
  @Override
  public void init(Map args) {
    super.init(args);
    String maxArg = args.get("maxGramSize");
    maxGramSize = (maxArg != null ? Integer.parseInt(maxArg)
        : NGramTokenFilter.DEFAULT_MAX_NGRAM_SIZE);

    String minArg = args.get("minGramSize");
    minGramSize = (minArg != null ? Integer.parseInt(minArg)
        : NGramTokenFilter.DEFAULT_MIN_NGRAM_SIZE);
  }

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