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