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 /**
23 * Normalizes token text to lower case.
24 *
25 * @version $Id: LowerCaseFilter.java 687357 2008-08-20 14:38:07Z mikemccand $
26 */
27 public final class LowerCaseFilter extends TokenFilter {
28 public LowerCaseFilter(TokenStream in) {
29 super(in);
30 }
31
32 public final Token next(final Token reusableToken) throws IOException {
33 assert reusableToken != null;
34 Token nextToken = input.next(reusableToken);
35 if (nextToken != null) {
36
37 final char[] buffer = nextToken.termBuffer();
38 final int length = nextToken.termLength();
39 for(int i=0;i<length;i++)
40 buffer[i] = Character.toLowerCase(buffer[i]);
41
42 return nextToken;
43 } else
44 return null;
45 }
46 }
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