Mercurial > jhg

annotate src/com/tmate/hgkit/ll/Nodeid.java @ 32:42585c7cd641

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial dump of a bundle
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 13 Jan 2011 03:41:10 +0100
parents 346b66add79d
children 51bc56c0addd
rev   line source
20
11cfabe692b3 Status operation for two repository revisions (no local dir involved)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 13
diff changeset
1 /*
11cfabe692b3 Status operation for two repository revisions (no local dir involved)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 13
diff changeset
2 * Copyright (c) 2010, 2011 Artem Tikhomirov
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
3 */
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
4 package com.tmate.hgkit.ll;
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
5
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
6 import static com.tmate.hgkit.ll.DigestHelper.toHexString;
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
7
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
8 import java.util.Arrays;
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
9
20
11cfabe692b3 Status operation for two repository revisions (no local dir involved)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 13
diff changeset
10
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
11
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
12 /**
20
11cfabe692b3 Status operation for two repository revisions (no local dir involved)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 13
diff changeset
13 * Whether to store fixed size array (20 bytes) - ease of manipulation (e.g. hashcode/equals), or
11cfabe692b3 Status operation for two repository revisions (no local dir involved)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 13
diff changeset
14 * memory effective - reuse supplied array, keep significant bits only?
11cfabe692b3 Status operation for two repository revisions (no local dir involved)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 13
diff changeset
15 * Fixed size array looks most appealing to me now - I doubt one can save any significant amount of memory.
11cfabe692b3 Status operation for two repository revisions (no local dir involved)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 13
diff changeset
16 * There'd always 20 non-zero bytes, the difference is only for any extra bytes one may pass to constructor
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
17 * @author artem
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
18 *
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
19 */
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
20 public final class Nodeid {
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
21
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
22 public static final Nodeid NULL = new Nodeid(new byte[20], false);
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
23 private final byte[] binaryData;
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
24
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
25 /**
28
b2251b7a9823 Explicit cons arg for clone is more error-prone
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
26 * @param binaryRepresentation - byte[20], kept by reference
b2251b7a9823 Explicit cons arg for clone is more error-prone
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
27 * @param shallClone - true if array is subject to future modification and shall be copied, not referenced
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
28 */
28
b2251b7a9823 Explicit cons arg for clone is more error-prone
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
29 public Nodeid(byte[] binaryRepresentation, boolean shallClone) {
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
30 // 5 int fields => 32 bytes
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
31 // byte[20] => 48 bytes
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
32 if (binaryRepresentation == null || binaryRepresentation.length != 20) {
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
33 throw new IllegalArgumentException();
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
34 }
28
b2251b7a9823 Explicit cons arg for clone is more error-prone
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
35 this.binaryData = shallClone ? binaryRepresentation.clone() : binaryRepresentation;
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
36 }
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
37
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
38 @Override
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
39 public int hashCode() {
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
40 // TODO consider own impl, especially if byte[] get replaced with 5 ints
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
41 return Arrays.hashCode(binaryData);
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
42 }
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
43
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
44 @Override
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
45 public boolean equals(Object o) {
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
46 if (o instanceof Nodeid) {
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
47 return Arrays.equals(this.binaryData, ((Nodeid) o).binaryData);
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
48 }
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
49 return false;
22
603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 20
diff changeset
50 }
603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 20
diff changeset
51
603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 20
diff changeset
52 public boolean equalsTo(byte[] buf) {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
53 return Arrays.equals(this.binaryData, buf);
22
603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 20
diff changeset
54 }
603806cd2dc6 Status of local working dir against non-tip base revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 20
diff changeset
55
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
56 @Override
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
57 public String toString() {
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
58 return toHexString(binaryData, 0, binaryData.length);
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
59 }
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
60
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
61 public String shortNotation() {
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
62 return toHexString(binaryData, 0, 6);
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
63 }
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
64
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
65 // binascii.unhexlify()
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
66 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
24
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
67 if (length != 40) {
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
68 throw new IllegalArgumentException();
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
69 }
d4fdd1845b3f Nodeid with array of exactly 20 bytes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 22
diff changeset
70 byte[] data = new byte[20];
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
71 boolean zeroBytes = true;
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
72 for (int i = 0, j = offset; i < data.length; i++) {
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
73 int hiNibble = Character.digit(asciiRepresentation[j++], 16);
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
74 int lowNibble = Character.digit(asciiRepresentation[j++], 16);
31
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
75 byte b = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
76 data[i] = b;
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
77 zeroBytes = zeroBytes && b == 0;
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
78 }
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
79 if (zeroBytes) {
346b66add79d Basic lookup for incoming changes
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 28
diff changeset
80 return NULL;
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
81 }
28
b2251b7a9823 Explicit cons arg for clone is more error-prone
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 24
diff changeset
82 return new Nodeid(data, false);
0
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
83 }
dbd663faec1f Basic changelog parsing
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
84 }