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 java.util.Map;
  import java.util.regex.Pattern;
  import java.util.regex.PatternSyntaxException;
  
  import org.apache.lucene.analysis.CharStream;
  
  /**
   * Factory for {@link PatternReplaceCharFilter}. 
   * <pre class="prettyprint" >
   * &lt;fieldType name="text_ptnreplace" class="solr.TextField" positionIncrementGap="100"&gt;
   *   &lt;analyzer&gt;
   *     &lt;charFilter class="solr.PatternReplaceCharFilterFactory" pattern="([^a-z])" replacement=""
   *                 maxBlockChars="10000" blockDelimiters="|"/&gt;
   *     &lt;tokenizer class="solr.KeywordTokenizerFactory"/&gt;
   *   &lt;/analyzer&gt;
   * &lt;/fieldType&gt;</pre>
   * 
   * @version $Id: PatternReplaceCharFilterFactory.java 1074023 2011-02-24 02:25:08Z koji $
   * @since Solr 3.1
   */
  public class PatternReplaceCharFilterFactory extends BaseCharFilterFactory {
    
    private Pattern p;
    private String replacement;
    private int maxBlockChars;
    private String blockDelimiters;
  
    @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" );
      if( replacement == null )
        replacement = "";
      maxBlockChars = getInt( "maxBlockChars", PatternReplaceCharFilter.DEFAULT_MAX_BLOCK_CHARS );
      blockDelimiters = args.get( "blockDelimiters" );
    }
  
    public CharStream create(CharStream input) {
      return new PatternReplaceCharFilter( p, replacement, maxBlockChars, blockDelimiters, input );
    }
  }
  