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comparison src/com/tmate/hgkit/ll/Changeset.java @ 0:dbd663faec1f

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Basic changelog parsing
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 17 Dec 2010 19:05:59 +0100
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children 08db726a0fb7
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-1:000000000000 0:dbd663faec1f
1 /**
2 * Copyright (c) 2010 Artem Tikhomirov
3 */
4 package com.tmate.hgkit.ll;
5
6 import java.io.UnsupportedEncodingException;
7 import java.util.ArrayList;
8
9 /**
10 * @see mercurial/changelog.py:read()
11 * <pre>
12 format used:
13 nodeid\n : manifest node in ascii
14 user\n : user, no \n or \r allowed
15 time tz extra\n : date (time is int or float, timezone is int)
16 : extra is metadatas, encoded and separated by '\0'
17 : older versions ignore it
18 files\n\n : files modified by the cset, no \n or \r allowed
19 (.*) : comment (free text, ideally utf-8)
20
21 changelog v0 doesn't use extra
22 * </pre>
23 * @author artem
24 */
25 public class Changeset {
26 private /*final*/ Nodeid nodeid;
27 private String user;
28 private String comment;
29 private ArrayList<String> files;
30 private String timezone; // FIXME
31 public byte[] rawData; // FIXME
32
33 public void dump() {
34 System.out.println("User:" + user);
35 System.out.println("Comment:" + comment);
36 System.out.println("Nodeid:" + nodeid);
37 System.out.println("Date:" + timezone);
38 System.out.println("Files: " + files.size());
39 for (String s : files) {
40 System.out.print('\t');
41 System.out.println(s);
42 }
43 }
44
45 public void read(byte[] buf, int offset, int length) {
46 rawData = new byte[length];
47 System.arraycopy(buf, offset, rawData, 0, length);
48 final int bufferEndIndex = offset + length;
49 final byte lineBreak = (byte) '\n';
50 int breakIndex1 = indexOf(buf, lineBreak, offset, bufferEndIndex);
51 if (breakIndex1 == -1) {
52 throw new IllegalArgumentException("Bad Changeset data");
53 }
54 nodeid = Nodeid.fromAscii(buf, 0, breakIndex1);
55 int breakIndex2 = indexOf(buf, lineBreak, breakIndex1+1, bufferEndIndex);
56 if (breakIndex2 == -1) {
57 throw new IllegalArgumentException("Bad Changeset data");
58 }
59 user = new String(buf, breakIndex1+1, breakIndex2 - breakIndex1 - 1);
60 int breakIndex3 = indexOf(buf, lineBreak, breakIndex2+1, bufferEndIndex);
61 if (breakIndex3 == -1) {
62 throw new IllegalArgumentException("Bad Changeset data");
63 }
64 timezone = new String(buf, breakIndex2+1, breakIndex3 - breakIndex2 - 1);
65
66 //
67 int lastStart = breakIndex3 + 1;
68 int breakIndex4 = indexOf(buf, lineBreak, lastStart, bufferEndIndex);
69 files = new ArrayList<String>(5);
70 while (breakIndex4 != -1 && breakIndex4 + 1 < bufferEndIndex) {
71 files.add(new String(buf, lastStart, breakIndex4 - lastStart));
72 lastStart = breakIndex4 + 1;
73 if (buf[breakIndex4 + 1] == lineBreak) {
74 // found \n\n
75 break;
76 } else {
77 breakIndex4 = indexOf(buf, lineBreak, lastStart, bufferEndIndex);
78 }
79 }
80 if (breakIndex4 == -1 || breakIndex4 >= bufferEndIndex) {
81 throw new IllegalArgumentException("Bad Changeset data");
82 }
83 try {
84 comment = new String(buf, breakIndex4+2, bufferEndIndex - breakIndex4 - 2, "UTF-8");
85 } catch (UnsupportedEncodingException ex) {
86 comment = "";
87 throw new IllegalStateException("Could hardly happen");
88 }
89 }
90
91 private static int indexOf(byte[] src, byte what, int startOffset, int endIndex) {
92 for (int i = startOffset; i < endIndex; i++) {
93 if (src[i] == what) {
94 return i;
95 }
96 }
97 return -1;
98 }
99 }