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    1   package org.apache.lucene.analysis;
    2   
    3   /**
    4    * Licensed to the Apache Software Foundation (ASF) under one or more
    5    * contributor license agreements.  See the NOTICE file distributed with
    6    * this work for additional information regarding copyright ownership.
    7    * The ASF licenses this file to You under the Apache License, Version 2.0
    8    * (the "License"); you may not use this file except in compliance with
    9    * the License.  You may obtain a copy of the License at
   10    *
   11    *     http://www.apache.org/licenses/LICENSE-2.0
   12    *
   13    * Unless required by applicable law or agreed to in writing, software
   14    * distributed under the License is distributed on an "AS IS" BASIS,
   15    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   16    * See the License for the specific language governing permissions and
   17    * limitations under the License.
   18    */
   19   
   20   import java.io.IOException;
   21   
   22   import org.apache.lucene.analysis.tokenattributes.TermAttribute;
   23   
   24   /**
   25    * Normalizes token text to lower case.
   26    */
   27   public final class LowerCaseFilter extends TokenFilter {
   28     public LowerCaseFilter(TokenStream in) {
   29       super(in);
   30       termAtt = addAttribute(TermAttribute.class);
   31     }
   32   
   33     private TermAttribute termAtt;
   34     
   35     @Override
   36     public final boolean incrementToken() throws IOException {
   37       if (input.incrementToken()) {
   38   
   39         final char[] buffer = termAtt.termBuffer();
   40         final int length = termAtt.termLength();
   41         for(int i=0;i<length;i++)
   42           buffer[i] = Character.toLowerCase(buffer[i]);
   43   
   44         return true;
   45       } else
   46         return false;
   47     }
   48   }

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