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 java.util.Map;
  import org.apache.lucene.analysis.TokenStream;
  import org.apache.lucene.analysis.ngram.EdgeNGramTokenFilter;
  
  /**
   * Creates new instances of {@link EdgeNGramTokenFilter}.
   * <pre class="prettyprint" >
   * &lt;fieldType name="text_edgngrm" class="solr.TextField" positionIncrementGap="100"&gt;
   *   &lt;analyzer&gt;
   *     &lt;tokenizer class="solr.WhitespaceTokenizerFactory"/&gt;
   *     &lt;filter class="solr.EdgeNGramFilterFactory" side="front" minGramSize="1" maxGramSize="1"/&gt;
   *   &lt;/analyzer&gt;
   * &lt;/fieldType&gt;</pre>
   * @version $Id$
   */
  public class EdgeNGramFilterFactory extends BaseTokenFilterFactory {
    private int maxGramSize = 0;
  
    private int minGramSize = 0;
  
    private String side;
  
    @Override
    public void init(Map<String, String> 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);
    }
  }
  