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Java > Open Source Codes > org > apache > lucene > analysis > LowerCaseFilter


1 package org.apache.lucene.analysis;
2
3 /**
4  * Copyright 2004 The Apache Software Foundation
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19 import java.io.IOException JavaDoc;
20
21 /**
22  * Normalizes token text to lower case.
23  *
24  * @version $Id: LowerCaseFilter.java 150259 2004-03-29 22:48:07Z cutting $
25  */
26 public final class LowerCaseFilter extends TokenFilter {
27   public LowerCaseFilter(TokenStream in) {
28     super(in);
29   }
30
31   public final Token next() throws IOException JavaDoc {
32     Token t = input.next();
33
34     if (t == null)
35       return null;
36
37     t.termText = t.termText.toLowerCase();
38
39     return t;
40   }
41 }
42
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