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Java > Open Source Codes > org > apache > lucene > index > IndexFileNames


1 package org.apache.lucene.index;
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 /**
20  * Useful constants representing filenames and extensions used by lucene
21  *
22  * @author Bernhard Messer
23  * @version $rcs = ' $Id: Exp $ ' ;
24  */
25 final class IndexFileNames {
26
27   /** Name of the index segment file */
28   static final String JavaDoc SEGMENTS = "segments";
29   
30   /** Name of the index deletable file */
31   static final String JavaDoc DELETABLE = "deletable";
32   
33   /**
34    * This array contains all filename extensions used by Lucene's index files, with
35    * one exception, namely the extension made up from <code>.f</code> + a number.
36    * Also note that two of Lucene's files (<code>deletable</code> and
37    * <code>segments</code>) don't have any filename extension.
38    */
39   static final String JavaDoc INDEX_EXTENSIONS[] = new String JavaDoc[] {
40       "cfs", "fnm", "fdx", "fdt", "tii", "tis", "frq", "prx", "del",
41       "tvx", "tvd", "tvf", "tvp" };
42   
43   /** File extensions of old-style index files */
44   static final String JavaDoc COMPOUND_EXTENSIONS[] = new String JavaDoc[] {
45     "fnm", "frq", "prx", "fdx", "fdt", "tii", "tis"
46   };
47   
48   /** File extensions for term vector support */
49   static final String JavaDoc VECTOR_EXTENSIONS[] = new String JavaDoc[] {
50     "tvx", "tvd", "tvf"
51   };
52   
53 }
54
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