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.solr.analysis;
  import org.apache.lucene.analysis.TokenStream;
  
  import java.util.Map;
  import java.util.regex.Pattern;
  import java.util.regex.PatternSyntaxException;
  
  /**
   * Factory for {@link PatternReplaceFilter}. 
   * <pre class="prettyprint" >
   * &lt;fieldType name="text_ptnreplace" class="solr.TextField" positionIncrementGap="100"&gt;
   *   &lt;analyzer&gt;
   *     &lt;tokenizer class="solr.KeywordTokenizerFactory"/&gt;
   *     &lt;filter class="solr.PatternReplaceFilterFactory" pattern="([^a-z])" replacement=""
   *             replace="all"/&gt;
   *   &lt;/analyzer&gt;
   * &lt;/fieldType&gt;</pre>
   * @version $Id$
   * @see PatternReplaceFilter
   */
  public class PatternReplaceFilterFactory extends BaseTokenFilterFactory {
    Pattern p;
    String replacement;
    boolean all = true;
    
    @Override
    public void init(Map<String, String> args) {
      super.init(args);
      try {
        p = Pattern.compile(args.get("pattern"));
      } catch (PatternSyntaxException e) {
        throw new RuntimeException
          ("Configuration Error: 'pattern' can not be parsed in " +
           this.getClass().getName(), e);
      }
      
      replacement = args.get("replacement");
      
      String r = args.get("replace");
      if (null != r) {
        if (r.equals("all")) {
          all = true;
        } else {
          if (r.equals("first")) {
            all = false;
          } else {
            throw new RuntimeException
              ("Configuration Error: 'replace' must be 'first' or 'all' in "
               + this.getClass().getName());
          }
        }
      }
  
    }
    public PatternReplaceFilter create(TokenStream input) {
      return new PatternReplaceFilter(input, p, replacement, all);
    }
  }
  