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comparison src/org/tmatesoft/hg/internal/RevlogStream.java @ 80:4222b04f34ee

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 25 Jan 2011 03:54:32 +0100
parents c677e1593919
children 61eedab3eb3e
comparison
equal deleted inserted replaced
79:5f9635c01681 80:4222b04f34ee
14 * the terms of a license other than GNU General Public License 14 * the terms of a license other than GNU General Public License
15 * contact TMate Software at support@svnkit.com 15 * contact TMate Software at support@svnkit.com
16 */ 16 */
17 package org.tmatesoft.hg.internal; 17 package org.tmatesoft.hg.internal;
18 18
19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
19 import static org.tmatesoft.hg.repo.HgRepository.TIP; 20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
20 21
21 import java.io.File; 22 import java.io.File;
22 import java.io.IOException; 23 import java.io.IOException;
23 import java.util.ArrayList; 24 import java.util.ArrayList;
26 import java.util.List; 27 import java.util.List;
27 import java.util.zip.DataFormatException; 28 import java.util.zip.DataFormatException;
28 import java.util.zip.Inflater; 29 import java.util.zip.Inflater;
29 30
30 import org.tmatesoft.hg.core.Nodeid; 31 import org.tmatesoft.hg.core.Nodeid;
32 import org.tmatesoft.hg.repo.HgRepository;
31 33
32 34
33 /** 35 /**
34 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations), 36 * ? Single RevlogStream per file per repository with accessor to record access session (e.g. with back/forward operations),
35 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)? 37 * or numerous RevlogStream with separate representation of the underlaying data (cached, lazy ChunkStream)?
87 } finally { 89 } finally {
88 daIndex.done(); 90 daIndex.done();
89 } 91 }
90 } 92 }
91 93
94 public byte[] nodeid(int revision) {
95 final int indexSize = revisionCount();
96 if (revision == TIP) {
97 revision = indexSize - 1;
98 }
99 if (revision < 0 || revision >= indexSize) {
100 throw new IllegalArgumentException(Integer.toString(revision));
101 }
102 DataAccess daIndex = getIndexStream();
103 try {
104 int recordOffset = inline ? (int) index.get(revision).offset : revision * REVLOGV1_RECORD_SIZE;
105 daIndex.seek(recordOffset + 32);
106 byte[] rv = new byte[20];
107 daIndex.readBytes(rv, 0, 20);
108 return rv;
109 } catch (IOException ex) {
110 ex.printStackTrace();
111 throw new IllegalStateException();
112 } finally {
113 }
114 }
115
92 // Perhaps, RevlogStream should be limited to use of plain int revisions for access, 116 // Perhaps, RevlogStream should be limited to use of plain int revisions for access,
93 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep 117 // while Nodeids should be kept on the level up, in Revlog. Guess, Revlog better keep
94 // map of nodeids, and once this comes true, we may get rid of this method. 118 // map of nodeids, and once this comes true, we may get rid of this method.
95 // Unlike its counterpart, Revlog#getLocalRevisionNumber, doesn't fail with exception if node not found, 119 // Unlike its counterpart, {@link Revlog#getLocalRevisionNumber()}, doesn't fail with exception if node not found,
96 // returns a predefined constant instead 120 /**
121 * @return integer in [0..revisionCount()) or {@link HgRepository#BAD_REVISION} if not found
122 */
97 public int findLocalRevisionNumber(Nodeid nodeid) { 123 public int findLocalRevisionNumber(Nodeid nodeid) {
98 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations 124 // XXX this one may be implemented with iterate() once there's mechanism to stop iterations
99 final int indexSize = revisionCount(); 125 final int indexSize = revisionCount();
100 DataAccess daIndex = getIndexStream(); 126 DataAccess daIndex = getIndexStream();
101 try { 127 try {
114 ex.printStackTrace(); // log error. FIXME better handling 140 ex.printStackTrace(); // log error. FIXME better handling
115 throw new IllegalStateException(ex); 141 throw new IllegalStateException(ex);
116 } finally { 142 } finally {
117 daIndex.done(); 143 daIndex.done();
118 } 144 }
119 return Integer.MIN_VALUE; 145 return BAD_REVISION;
120 } 146 }
121 147
122 148
123 private final int REVLOGV1_RECORD_SIZE = 64; 149 private final int REVLOGV1_RECORD_SIZE = 64;
124 150