content: /*
   * 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.
   */
  package org.apache.lucene.analysis.core;
  
  
  import org.apache.lucene.analysis.CharArraySet;
  import org.apache.lucene.analysis.TokenStream;
  import org.apache.lucene.analysis.en.EnglishAnalyzer;
  import org.apache.lucene.util.ResourceLoader;
  import org.apache.lucene.util.ResourceLoaderAware;
  import org.apache.lucene.analysis.TokenFilterFactory;
  
  import java.io.IOException;
  import java.util.Map;
  
  /**
   * Modified StopFilterFactory, because the 'wise' people of Lucene:
   * - removed ability to 'not count' gaps
   * - and also, in their infinite wisdom, made the option private
   * (so the poor devs have not other chance then to fork)
   */
  
  public class AqpStopFilterFactory extends TokenFilterFactory implements ResourceLoaderAware {
      public static final String FORMAT_WORDSET = "wordset";
      public static final String FORMAT_SNOWBALL = "snowball";
  
      private CharArraySet stopWords;
      private final String stopWordFiles;
      private final String format;
      private final boolean ignoreCase;
      private final boolean ignorePosition;
  
      /**
       * Creates a new StopFilterFactory
       */
      public AqpStopFilterFactory(Map<String, String> args) {
          super(args);
          stopWordFiles = get(args, "words");
          format = get(args, "format", (null == stopWordFiles ? null : FORMAT_WORDSET));
          ignoreCase = getBoolean(args, "ignoreCase", false);
          ignorePosition = getBoolean(args, "ignorePosition", true);
          if (!args.isEmpty()) {
              throw new IllegalArgumentException("Unknown parameters: " + args);
          }
      }
  
      @Override
      public void inform(ResourceLoader loader) throws IOException {
          if (stopWordFiles != null) {
              if (FORMAT_WORDSET.equalsIgnoreCase(format)) {
                  stopWords = getWordSet(loader, stopWordFiles, ignoreCase);
              } else if (FORMAT_SNOWBALL.equalsIgnoreCase(format)) {
                  stopWords = getSnowballWordSet(loader, stopWordFiles, ignoreCase);
              } else {
                  throw new IllegalArgumentException("Unknown 'format' specified for 'words' file: " + format);
              }
          } else {
              if (null != format) {
                  throw new IllegalArgumentException("'format' can not be specified w/o an explicit 'words' file: " + format);
              }
              stopWords = new CharArraySet(EnglishAnalyzer.ENGLISH_STOP_WORDS_SET, ignoreCase);
          }
      }
  
      public boolean isIgnoreCase() {
          return ignoreCase;
      }
  
      public CharArraySet getStopWords() {
          return stopWords;
      }
  
      @Override
      public TokenStream create(TokenStream input) {
          AqpStopFilter stopFilter = new AqpStopFilter(input, stopWords, ignorePosition);
          return stopFilter;
      }
  }
  