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comparison src/org/tmatesoft/hg/internal/RevisionLookup.java @ 628:6526d8adbc0f

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Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 22 May 2013 15:52:31 +0200
parents 46f29b73e51e
children
comparison
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627:5153eb73b18d 628:6526d8adbc0f
19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION; 19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
20 20
21 import java.util.Arrays; 21 import java.util.Arrays;
22 22
23 import org.tmatesoft.hg.core.Nodeid; 23 import org.tmatesoft.hg.core.Nodeid;
24 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
25 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
24 import org.tmatesoft.hg.repo.HgRevisionMap; 26 import org.tmatesoft.hg.repo.HgRevisionMap;
27 import org.tmatesoft.hg.repo.HgRuntimeException;
25 28
26 /** 29 /**
27 * Lite alternative to {@link HgRevisionMap}, to speed up nodeid to index conversion without consuming too much memory. 30 * Lite alternative to {@link HgRevisionMap}, to speed up nodeid to index conversion without consuming too much memory.
28 * E.g. for a 100k revisions, {@link HgRevisionMap} consumes 3 * (N * sizeof(int)) for indexes plus 48 bytes per 31 * E.g. for a 100k revisions, {@link HgRevisionMap} consumes 3 * (N * sizeof(int)) for indexes plus 48 bytes per
29 * Nodeid instance, total (12+48)*N = 6 mb of memory. {RevisionLookup} instead keeps only Nodeid hashes, (N * sizeof(int) = 400 kb), 32 * Nodeid instance, total (12+48)*N = 6 mb of memory. {RevisionLookup} instead keeps only Nodeid hashes, (N * sizeof(int) = 400 kb),
40 public RevisionLookup(RevlogStream stream) { 43 public RevisionLookup(RevlogStream stream) {
41 assert stream != null; 44 assert stream != null;
42 content = stream; 45 content = stream;
43 } 46 }
44 47
45 public static RevisionLookup createFor(RevlogStream stream) { 48 public static RevisionLookup createFor(RevlogStream stream) throws HgRuntimeException {
46 RevisionLookup rv = new RevisionLookup(stream); 49 RevisionLookup rv = new RevisionLookup(stream);
47 int revCount = stream.revisionCount(); 50 int revCount = stream.revisionCount();
48 rv.prepare(revCount); 51 rv.prepare(revCount);
49 if (revCount > 0) { 52 if (revCount > 0) {
50 stream.iterate(0, revCount - 1, false, rv); 53 stream.iterate(0, revCount - 1, false, rv);
60 nodeidHashes[index] = Nodeid.hashCode(nodeid); 63 nodeidHashes[index] = Nodeid.hashCode(nodeid);
61 } 64 }
62 public void next(int index, Nodeid nodeid) { 65 public void next(int index, Nodeid nodeid) {
63 nodeidHashes[index] = nodeid.hashCode(); 66 nodeidHashes[index] = nodeid.hashCode();
64 } 67 }
65 public int findIndex(Nodeid nodeid) { 68 public int findIndex(Nodeid nodeid) throws HgInvalidControlFileException, HgInvalidRevisionException {
66 final int hash = nodeid.hashCode(); 69 final int hash = nodeid.hashCode();
67 for (int i = 0; i < nodeidHashes.length; i++) { 70 for (int i = 0; i < nodeidHashes.length; i++) {
68 if (nodeidHashes[i] == hash) { 71 if (nodeidHashes[i] == hash) {
69 byte[] nodeidAtI = content.nodeid(i); 72 byte[] nodeidAtI = content.nodeid(i);
70 if (nodeid.equalsTo(nodeidAtI)) { 73 if (nodeid.equalsTo(nodeidAtI)) {