content: 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.TokenStream;
  import org.apache.lucene.analysis.ngram.NGramTokenizer;
  
  import java.io.Reader;
  import java.util.Map;
  
  /**
   * Factory for {@link NGramTokenizer}.
   * <pre class="prettyprint" >
   * &lt;fieldType name="text_ngrm" class="solr.TextField" positionIncrementGap="100"&gt;
   *   &lt;analyzer&gt;
   *     &lt;tokenizer class="solr.NGramTokenizerFactory" minGramSize="1" maxGramSize="2"/&gt;
   *   &lt;/analyzer&gt;
   * &lt;/fieldType&gt;</pre> 
   * @version $Id$
   */
  public class NGramTokenizerFactory extends BaseTokenizerFactory {
      private int maxGramSize = 0;
      private int minGramSize = 0;
      
      /** Initializes the n-gram min and max sizes and the side from which one should start tokenizing. */
      @Override
      public void init(Map<String, String> args) {
          super.init(args);
          String maxArg = args.get("maxGramSize");
          maxGramSize = (maxArg != null ? Integer.parseInt(maxArg) : NGramTokenizer.DEFAULT_MAX_NGRAM_SIZE);
  
          String minArg = args.get("minGramSize");
          minGramSize = (minArg != null ? Integer.parseInt(minArg) : NGramTokenizer.DEFAULT_MIN_NGRAM_SIZE);
      }
  
      /** Creates the {@link TokenStream} of n-grams from the given {@link Reader}. */
      public NGramTokenizer create(Reader input) {
          return new NGramTokenizer(input, minGramSize, maxGramSize);
      }
  }
  