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mnemosyne.archiver.SnapshotDirectory	100%	100%

1		/*
2		* Copyright 2004 Charles Blaxland
3		*
4		* Licensed under the Apache License, Version 2.0 (the "License");
5		* you may not use this file except in compliance with the License.
6		* You may obtain a copy of the License at
7		*
8		* http://www.apache.org/licenses/LICENSE-2.0
9		*
10		* Unless required by applicable law or agreed to in writing, software
11		* distributed under the License is distributed on an "AS IS" BASIS,
12		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13		* See the License for the specific language governing permissions and
14		* limitations under the License.
15		*/
16		package mnemosyne.archiver;
17
18		import mnemosyne.core.PersistentRoot;
19		import org.apache.commons.logging.Log;
20		import org.apache.commons.logging.LogFactory;
21
22		import java.io.*;
23
24		/**
25		* @version $Id: SnapshotDirectory.java,v 1.1.1.1 2004/08/07 06:40:54 charlesblaxland Exp $
26		*/
27		public class SnapshotDirectory extends ArchiveDirectory
28		{
29	4	private static final Log log = LogFactory.getLog(SnapshotDirectory.class);
30
31		private static final String SNAPSHOT_FILE_PREFIX = "";
32		private static final String SNAPSHOT_FILE_POSTFIX = "_snapshot";
33		private static final String SNAPSHOT_FILE_EXTENSION = "snp";
34
35		public SnapshotDirectory(String directoryName, ArchiveSequence sequence)
36		{
37	7	super(directoryName, sequence);
38	7	}
39
40		protected String prefix()
41		{
42	22	return SNAPSHOT_FILE_PREFIX;
43		}
44
45		protected String postfix()
46		{
47	22	return SNAPSHOT_FILE_POSTFIX;
48		}
49
50		protected String extension()
51		{
52	15	return SNAPSHOT_FILE_EXTENSION;
53		}
54
55		public long getLatestSnapshotSequenceNumber()
56		{
57	5	if (archiveFiles.isEmpty())
58		{
59	1	return -1;
60		}
61		else
62		{
63	4	return extractFileSequenceNumber((String)archiveFiles.last());
64		}
65		}
66
67		public PersistentRoot readLatestSnapshot() throws ArchiverException
68		{
69	3	if (archiveFiles.isEmpty())
70		{
71	1	log.info("No snapshots found");
72	1	return null;
73		}
74
75	2	String latestSnapshotName = (String)archiveFiles.last();
76	2	File latestSnapshot = constructArchiveFile(latestSnapshotName);
77	2	return (PersistentRoot) readArchiveFile(latestSnapshot);
78		}
79		}

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