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annotate src/org/tmatesoft/hg/internal/Patch.java @ 437:32184ddcf46d

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Better argument names
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 17 Apr 2012 22:29:50 +0200
parents 6c22bdc0bdfd
children 0f6fa88e2162
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.IOException;
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20 import java.util.ArrayList;
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21 import java.util.Formatter;
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22
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23 /**
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24 * @see http://mercurial.selenic.com/wiki/BundleFormat
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25 * in Changelog group description
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26 *
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27 * range [start..end] in original source gets replaced with data of length (do not keep, use data.length instead)
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28 * range [end(i)..start(i+1)] is copied from the source
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public final class Patch {
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34 private final IntVector starts, ends;
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35 private final ArrayList<byte[]> data;
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36
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37 private static byte[] generate(int c) {
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38 byte[] rv = new byte[c];
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39 for (int i = 0; i < c; i++) {
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40 byte x = (byte) ('a' + i);
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41 rv[i] = x;
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42 }
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43 return rv;
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44 }
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45
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46 public static void main(String[] args) {
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47 Patch p1 = new Patch(), p2 = new Patch();
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48 // simple cases (one element in either patch)
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49 // III: (1,10 20) & (5,15,15) p2End from [p1End..p1AppliedEnd] (i.e. within p1 range but index is past p2 end index)
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50 // II: (1,10,7) & (3,15,15) insideP2 = true and no more p1 entries
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51 // II: (1,1,10) & (3,11,15)
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52 // independent: (1,10,10) & (15,25,10); (15, 25, 10) & (1, 10, 10)
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53 // I: (15, 25, 10) & (10, 20, 10). result: [10, 20, 10] [20, 25, 5]
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54 // IV: (15, 25, 10) & (10, 30, 20)
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55 //
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56 // cycle with insideP2
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57 //
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58 // cycle with insideP1
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59 //
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60 // multiple elements in patches (offsets)
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61 p1.add(15, 25, generate(10));
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62 p2.add(10, 30, generate(20));
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63 System.out.println("p1: " + p1);
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64 System.out.println("p2: " + p2);
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65 Patch r = p1.apply(p2);
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66 System.out.println("r: " + r);
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67 }
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68
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69 public Patch() {
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70 starts = new IntVector();
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71 ends = new IntVector();
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72 data = new ArrayList<byte[]>();
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73 }
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74
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75 public String toString() {
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76 StringBuilder sb = new StringBuilder();
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77 Formatter f = new Formatter(sb);
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78 for (int i = 0; i < count(); i++) {
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79 f.format("[%d, %d, %d] ", starts.get(i), ends.get(i), data.get(i).length);
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80 }
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81 return sb.toString();
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82 }
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83
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84 public int count() {
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85 return data.size();
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86 }
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87
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88 // number of bytes this patch will add (or remove, if negative) from the base revision
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89 private int patchSizeDelta() {
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90 int rv = 0;
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91 int prevEnd = 0;
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92 for (int i = 0, x = data.size(); i < x; i++) {
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93 final int start = starts.get(i);
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94 final int len = data.get(i).length;
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95 rv += start - prevEnd; // would copy from original
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96 rv += len; // and add new
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97 prevEnd = ends.get(i);
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98 }
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99 rv -= prevEnd;
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100 return rv;
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101 }
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102
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103 public byte[] apply(DataAccess baseRevisionContent, int outcomeLen) throws IOException {
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104 if (outcomeLen == -1) {
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105 outcomeLen = baseRevisionContent.length() + patchSizeDelta();
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106 }
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107 int prevEnd = 0, destIndex = 0;
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108 byte[] rv = new byte[outcomeLen];
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109 for (int i = 0, x = data.size(); i < x; i++) {
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110 final int start = starts.get(i);
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111 baseRevisionContent.seek(prevEnd);
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112 // copy source bytes that were not modified (up to start of the record)
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113 baseRevisionContent.readBytes(rv, destIndex, start - prevEnd);
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114 destIndex += start - prevEnd;
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115 // insert new data from the patch, if any
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116 byte[] d = data.get(i);
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117 System.arraycopy(d, 0, rv, destIndex, d.length);
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118 destIndex += d.length;
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119 prevEnd = ends.get(i);
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120 }
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121 baseRevisionContent.seek(prevEnd);
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122 // copy everything in the source past last record's end
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123 baseRevisionContent.readBytes(rv, destIndex, (baseRevisionContent.length() - prevEnd));
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124 return rv;
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125 }
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126
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127 public void clear() {
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128 starts.clear();
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129 ends.clear();
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130 data.clear();
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131 }
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132
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133 /**
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134 * Initialize instance from stream. Any previous patch information (i.e. if instance if reused) is cleared first.
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135 * Read up to the end of DataAccess and interpret data as patch records.
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136 */
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137 public void read(DataAccess da) throws IOException {
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138 clear();
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139 while (!da.isEmpty()) {
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140 readOne(da);
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141 }
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142 }
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143
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144 /**
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145 * Caller is responsible to ensure stream got some data to read
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146 */
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147 public void readOne(DataAccess da) throws IOException {
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148 int s = da.readInt();
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149 int e = da.readInt();
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150 int len = da.readInt();
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151 byte[] src = new byte[len];
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152 da.readBytes(src, 0, len);
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153 starts.add(s);
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154 ends.add(e);
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155 data.add(src);
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156 }
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157
330
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158 private void add(Patch p, int i) {
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159 add(p.starts.get(i), p.ends.get(i), p.data.get(i));
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160 }
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161
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162 private void add(int start, int end, byte[] d) {
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163 starts.add(start);
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164 ends.add(end);
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165 data.add(d);
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166 }
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167
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168 private static byte[] subarray(byte[] d, int start, int end) {
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169 byte[] r = new byte[end-start+1];
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170 System.arraycopy(d, start, r, 0, r.length);
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171 return r;
329
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172 }
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173
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174 /**
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175 * Modify this patch with subsequent patch
330
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176 */
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177 private /*SHALL BE PUBLIC ONCE TESTING ENDS*/ Patch apply(Patch another) {
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178 Patch r = new Patch();
330
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179 int p1TotalAppliedDelta = 0; // value to add to start and end indexes of the older patch to get their values as if
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180 // in the patched text, iow, directly comparable with respective indexes from the newer patch.
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181 int p1EntryStart = 0, p1EntryEnd = 0, p1EntryLen = 0;
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182 byte[] p1Data = null;
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183 boolean insideP1entry = false;
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184 int p2 = 0, p1 = 0;
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185 final int p2Max = another.count(), p1Max = this.count();
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186 L0: for (; p2 < p2Max; p2++) {
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187 int p2EntryStart = another.starts.get(p2);
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188 int p2EntryEnd = another.ends.get(p2);
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189 final int p2EntryRange = p2EntryEnd - p2EntryStart;
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190 final byte[] p2Data = another.data.get(p2);
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191 boolean insideP2entry = false;
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192 int p2EntryStartOffset = -1;
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193 ///
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194 p1EntryStart = p1EntryEnd = p1EntryLen = 0;
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195 p1Data = null;
329
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196
330
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197 L1: while (p1 < p1Max) {
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198 if (!insideP1entry) {
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199 p1EntryStart = starts.get(p1);
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200 p1EntryEnd = ends.get(p1);
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201 p1Data = data.get(p1);
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202 p1EntryLen = p1Data.length;
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203 }// else keep values
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204
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205 final int p1EntryDelta = p1EntryLen - (p1EntryEnd - p1EntryStart); // number of actually inserted(+) or deleted(-) chars
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206 final int p1EntryAppliedStart = p1TotalAppliedDelta + p1EntryStart;
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207 final int p1EntryAppliedEnd = p1EntryAppliedStart + p1EntryLen; // end of j'th patch entry in the text which is source for p2
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208
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209 if (insideP2entry) {
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210 if (p2EntryEnd < p1EntryAppliedStart) {
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211 r.add(p2EntryStart - p2EntryStartOffset, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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212 insideP2entry = false;
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213 continue L0;
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214 }
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215 if (p2EntryEnd >= p1EntryAppliedEnd) {
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216 // when p2EntryEnd == p1EntryAppliedEnd, I assume p1TotalAppliedDelta can't be used for p2EntryEnd to get it to p1 range, but rather shall be
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217 // augmented with current p1 entry and at the next p1 entry (likely to hit p1EntryAppliedStart > p2EntryEnd above) would do the rest
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218 insideP1entry = false;
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219 p1++;
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220 p1TotalAppliedDelta += p1EntryDelta;
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221 continue L1;
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222 }
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223 // p1EntryAppliedStart <= p2EntryEnd < p1EntryAppliedEnd
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224 r.add(p2EntryStart - p2EntryStartOffset, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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225 p1EntryStart = p2EntryEnd - p1TotalAppliedDelta;
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226 final int p1DataPartShift = p2EntryEnd - p1EntryAppliedStart + 1;
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227 if (p1DataPartShift >= p1EntryLen) {
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228 p1EntryLen = 0;
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229 p1Data = new byte[0];
329
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230 } else {
330
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231 p1EntryLen -= p1DataPartShift;
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232 p1Data = subarray(p1Data, p1DataPartShift, p1Data.length);
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233 }
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234 insideP1entry = true;
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235 insideP2entry = false;
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236 continue L0;
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237 }
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238
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239 if (p1EntryAppliedStart < p2EntryStart) {
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240 if (p1EntryAppliedEnd <= p2EntryStart) { // p1EntryAppliedEnd in fact index of the first char *after* patch
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241 // completely independent, copy and continue
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242 r.add(p1EntryStart, p1EntryEnd, p1Data);
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243 insideP1entry = false;
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244 p1++;
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245 // fall-through to get p1TotalAppliedDelta incremented
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246 } else { // SKETCH: II or III
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247 // remember, p1EntryDelta may be negative
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248 // shall break j'th entry into few
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249 // fix p1's end/length
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250 // p1EntryAppliedStart < p2EntryStart < p1EntryAppliedEnd
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251 int s = p2EntryStart - p1TotalAppliedDelta; // p2EntryStart in p1 scale. Is within p1 range
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252 if (s > p1EntryEnd) {
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253 s = p1EntryEnd;
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254 }
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255 int p1DataPartEnd = p2EntryStart - p1EntryAppliedStart; // index, not count. <= (p1EntryEnd-p1EntryStart).
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256 // add what left from p1
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257 if (p1DataPartEnd < p1EntryLen) {
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258 r.add(p1EntryStart, s, subarray(p1Data, 0, p1DataPartEnd));
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259 } else {
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260 p1DataPartEnd = p1EntryLen-1; // record factual number of p1 bytes we consumed.
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261 r.add(p1EntryStart, s, p1Data);
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262 }
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263 p1TotalAppliedDelta += p1DataPartEnd - (s - p1EntryStart); // (s2 - (s1+delta)) - (s2 - delta - s1) = s2-s1-delta-s2+delta+s1 = 0, unless p1DataPartEnd >= p1Data.length
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264 p1EntryLen -= (p1DataPartEnd+1);
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265 if (p2EntryEnd < p1EntryAppliedEnd) {
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266 // SKETCH: III
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267 insideP1entry = true;
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268 // p2 completely fits into changes of p1
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269 int e = p2EntryEnd - p1TotalAppliedDelta; // p2EntryEnd in p1 scale
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270 if (e > p1EntryEnd) {
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271 // any index past p1 end shall be calculated with respect to p1 end, thus it's unsafe to go past p1 end (there may be more p1 entries there)
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272 e = p1EntryEnd;
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273 }
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274 r.add(s, e, p2Data); // add p2
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275 // modify p1 leftover
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276 p1EntryStart = e;
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277 if (p2EntryRange >= p1EntryLen) {
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278 p1EntryLen = 0;
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279 p1Data = new byte[0];
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280 } else {
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281 p1Data = subarray(p1Data, p1DataPartEnd + p2EntryRange, p1Data.length-1 /*up to the last one*/);
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282 p1EntryLen -= p2EntryRange;
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283 }
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284 // p2 is handled, but there are leftovers of p1
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285 continue L0;
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286 } else { // p2EntryEnd >= p1EntryAppliedEnd
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287 // SKETCH: II
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288 insideP1entry = false;
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289 p1++;
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290 if (p1EntryAppliedStart + p1EntryDelta >= p2EntryEnd) {
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291 // here we know next p1 entry would be past p2 entry and thus can put p2 right away
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292 r.add(p2EntryStart - p1TotalAppliedDelta, p1EntryEnd, p2Data);
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293 p1TotalAppliedDelta += p1EntryDelta;
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294 continue L0;
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295 } else {
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296 // there are chances there are more p1 entries till p2 ends
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297 insideP2entry = true;
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298 p2EntryStartOffset = p1TotalAppliedDelta;
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299 // p2EntryEnd is past delta, no chances for p1Data leftovers to be in use
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300 // p2 processing is not over, need to fix end, depending on what else fits into p2 range (if nothing, can put p2.end right away)
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301 // fall-through to get p1TotalAppliedDelta incremented;
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302 }
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303 }
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304 }
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305 } else { // p1EntryAppliedStart >= p2EntryStart
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306 if (p2EntryEnd < p1EntryAppliedStart) {
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307 // newer patch completely fits between two older patches
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308 r.add(p2EntryStart - p1TotalAppliedDelta, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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309 // SHALL NOT increment p1TotalAppliedDelta as we didn't use any of p1
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310 continue L0; // next p2
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311 } else { // p2EntryEnd >= p1EntryAppliedStart
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312 // SKETCH: I or IV
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313 // p2EntryEnd is either < p1EntryAppliedEnd or past it
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diff changeset
314 if (p2EntryEnd <= p1EntryAppliedEnd) {
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diff changeset
315 // SKETCH: I: copy p2, strip p1 to start from p2EntryEnd, next i (p2)
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316 insideP1entry = true;
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317 int e = p2EntryEnd - p1TotalAppliedDelta;
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318 if (e > p1EntryEnd) {
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diff changeset
319 e = p1EntryEnd; // added by analogy with above. Is needed?
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320 }
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321 r.add(p2EntryStart - p1TotalAppliedDelta, e, p2Data);
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322 p1EntryStart = e;
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323 int p1DataShift = p2EntryEnd - p1EntryAppliedStart;
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diff changeset
324 if (p1DataShift >= p1EntryLen) {
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325 p1EntryLen = 0;
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326 p1Data = new byte[0];
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327 } else {
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328 p1EntryLen -= p1DataShift;
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diff changeset
329 p1Data = subarray(p1Data, p1DataShift, p1Data.length - 1);
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diff changeset
330 }
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331 // p1TotalAppliedDelta would get incremented once this modified p1 is handled
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diff changeset
332 continue L0; // next p2;
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333 } else {
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334 // p2EntryEnd > p1EntryAppliedEnd
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diff changeset
335 // SKETCH IV: skip (rest of) p1 completely, continue the same unless found p1 with start or end past p2EntryEnd.
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336 insideP1entry = false;
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337 p1++;
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338 insideP2entry = true;
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339 p2EntryStartOffset = p1TotalAppliedDelta;
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diff changeset
340 // fall-through to get p1TotalAppliedDelta incremented
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341 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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342 }
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343 }
330
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344 p1TotalAppliedDelta += p1EntryDelta;
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345 } // while (p1 < p1Max)
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346 {
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diff changeset
347 // no more p1 entries, shall close p2 (if it's handled, code above jumps directly to L0)
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diff changeset
348 // regardless of whether insideP2 is .t
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349 int s = p2EntryStart;
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diff changeset
350 // p2EntryStartOffset != -1 when we started p2 entry processing, but not completed
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diff changeset
351 // if we handled last p1 entry but didn't start with p2 entry processing, it's -1 and regular p1 delta shall be used
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diff changeset
352 s -= p2EntryStartOffset == -1 ? p1TotalAppliedDelta : p2EntryStartOffset;
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diff changeset
353 r.add(s, p2EntryEnd - p1TotalAppliedDelta, p2Data);
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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354 }
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355 }
330
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diff changeset
356 if (p1 < p1Max && insideP1entry) {
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diff changeset
357 r.add(p1EntryStart, p1EntryEnd, p1Data);
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diff changeset
358 p1++;
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359 }
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diff changeset
360 while (p1 < p1Max) {
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diff changeset
361 r.add(this, p1);
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362 p1++;
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363 };
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364 return r;
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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365 }
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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366 }