content: /**
   * Copyright 2009 Alexander Kuznetsov
   *
   * Licensed 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.
   */
  package org.apache.lucene.analysis.morphology;
  
  import org.apache.lucene.analysis.TokenFilterFactory;
  import org.apache.lucene.analysis.TokenStream;
  
  import org.apache.lucene.morphology.LuceneMorphology;
  import org.apache.lucene.morphology.analyzer.MorphologyFilter;
  import org.apache.lucene.util.ResourceLoader;
  import org.apache.lucene.util.ResourceLoaderAware;
  
  import java.util.Map;
  
  /**
   * Factory for {@link MorphologyFilter}, with configurable language
   * <p>
   * <b>Note:</b> Two languages are available now: English (default value) and Russian.
   * <pre class="prettyprint">
   * &lt;fieldType name="content" class="solr.TextField" positionIncrementGap="100"&gt;
   *   &lt;analyzer&gt;
   *     &lt;tokenizer class="solr.StandardTokenizerFactory"/&gt;
   *     &lt;filter class="solr.LowerCaseFilterFactory"/&gt;
   *     &lt;filter class="solr.MorphologyFilterFactory" language="English"/&gt;
   *   &lt;/analyzer&gt;
   * &lt;/fieldType&gt;</pre>
   */
  public class MorphologyFilterFactory extends TokenFilterFactory implements ResourceLoaderAware {
  
      private static final String LANGUAGE_KEY = "language";
  
      private String language;
      private LuceneMorphology luceneMorphology;
  
      public MorphologyFilterFactory(Map<String, String> args) {
          super(args);
  
          language = get(args, LANGUAGE_KEY, "English");
          if (!args.isEmpty()) {
              throw new IllegalArgumentException("Unknown parameters: " + args);
          }
      }
  
      public TokenStream create(TokenStream input) {
          return new MorphologyFilter(input, luceneMorphology);
      }
  
      public void inform(ResourceLoader loader) {
  
          String className = "org.apache.lucene.morphology." + language.toLowerCase() + "." + language + "LuceneMorphology";
          luceneMorphology = loader.newInstance(className, LuceneMorphology.class);
      }
  
      public LuceneMorphology getLuceneMorphology() {
          return luceneMorphology;
      }
  }
  