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annotate src/org/tmatesoft/hg/internal/Patch.java @ 584:ed243b668502

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Conditionally enable effective patch merge alternative for revlog reading
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 25 Apr 2013 16:08:17 +0200
parents 47dfa0ec7e35
children a52f4cc56f9c
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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 private final boolean shallNormalize;
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37
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38 private static byte[] generate(int c) {
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39 byte[] rv = new byte[c];
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40 for (int i = 0; i < c; i++) {
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41 byte x = (byte) ('a' + i);
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42 rv[i] = x;
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43 }
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44 return rv;
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45 }
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46
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47 public static void main(String[] args) {
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48 Patch p1 = new Patch(), p2 = new Patch();
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49 // simple cases (one element in either patch)
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50 // 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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51 // II: (1,10,7) & (3,15,15) insideP2 = true and no more p1 entries
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52 // II: (1,1,10) & (3,11,15)
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53 // independent: (1,10,10) & (15,25,10); (15, 25, 10) & (1, 10, 10)
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54 // I: (15, 25, 10) & (10, 20, 10). result: [10, 20, 10] [20, 25, 5]
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55 // IV: (15, 25, 10) & (10, 30, 20)
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56 //
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57 // cycle with insideP2
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58 //
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59 // cycle with insideP1
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60 //
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61 // multiple elements in patches (offsets)
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62 p1.add(15, 25, generate(10));
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63 p2.add(10, 30, generate(20));
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64 System.out.println("p1: " + p1);
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65 System.out.println("p2: " + p2);
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66 Patch r = p1.apply(p2);
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67 System.out.println("r: " + r);
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68 }
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69
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70 public Patch() {
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71 this(false);
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72 }
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73
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74 public Patch(boolean normalizeOnChange) {
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75 shallNormalize = normalizeOnChange;
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76 starts = new IntVector();
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77 ends = new IntVector();
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78 data = new ArrayList<byte[]>();
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79 }
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80
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81 public String toString() {
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82 StringBuilder sb = new StringBuilder();
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83 Formatter f = new Formatter(sb);
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84 for (int i = 0; i < count(); i++) {
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85 f.format("[%d, %d, %d] ", starts.get(i), ends.get(i), data.get(i).length);
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86 }
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87 return sb.toString();
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88 }
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89
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90 public int count() {
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91 return data.size();
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92 }
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93
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94 // number of bytes this patch will add (or remove, if negative) from the base revision
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95 public int patchSizeDelta() {
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96 int rv = 0;
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97 int prevEnd = 0;
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98 for (int i = 0, x = data.size(); i < x; i++) {
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99 final int start = starts.get(i);
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100 final int len = data.get(i).length;
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101 rv += start - prevEnd; // would copy from original
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102 rv += len; // and add new
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103 prevEnd = ends.get(i);
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104 }
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105 rv -= prevEnd;
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106 return rv;
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107 }
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108
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109 public byte[] apply(DataAccess baseRevisionContent, int outcomeLen) throws IOException {
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110 if (outcomeLen == -1) {
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111 outcomeLen = baseRevisionContent.length() + patchSizeDelta();
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112 }
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113 int prevEnd = 0, destIndex = 0;
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114 byte[] rv = new byte[outcomeLen];
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115 for (int i = 0, x = data.size(); i < x; i++) {
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116 final int start = starts.get(i);
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117 baseRevisionContent.seek(prevEnd);
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118 // copy source bytes that were not modified (up to start of the record)
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119 baseRevisionContent.readBytes(rv, destIndex, start - prevEnd);
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120 destIndex += start - prevEnd;
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121 // insert new data from the patch, if any
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122 byte[] d = data.get(i);
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123 System.arraycopy(d, 0, rv, destIndex, d.length);
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124 destIndex += d.length;
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125 prevEnd = ends.get(i);
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126 }
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127 baseRevisionContent.seek(prevEnd);
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128 // copy everything in the source past last record's end
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129 baseRevisionContent.readBytes(rv, destIndex, (baseRevisionContent.length() - prevEnd));
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130 return rv;
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131 }
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132
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133 public void clear() {
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134 starts.clear();
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135 ends.clear();
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136 data.clear();
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137 }
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138
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139 /**
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140 * Initialize instance from stream. Any previous patch information (i.e. if instance if reused) is cleared first.
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141 * Read up to the end of DataAccess and interpret data as patch records.
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142 */
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143 public void read(DataAccess da) throws IOException {
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144 clear();
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145 while (!da.isEmpty()) {
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146 readOne(da);
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147 }
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148 }
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149
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150 /**
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151 * Caller is responsible to ensure stream got some data to read
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152 */
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153 public void readOne(DataAccess da) throws IOException {
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154 int s = da.readInt();
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155 int e = da.readInt();
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156 int len = da.readInt();
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157 byte[] src = new byte[len];
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158 da.readBytes(src, 0, len);
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159 starts.add(s);
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160 ends.add(e);
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161 data.add(src);
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162 }
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163
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164 /**
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165 * @return how many bytes the patch would take if written down using BundleFormat structure (start, end, length, data)
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166 */
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167 public int serializedLength() {
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168 int totalDataLen = 0;
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169 for (byte[] d : data) {
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170 totalDataLen += d.length;
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171 }
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172 int prefix = 3 * 4 * count(); // 3 integer fields per entry * sizeof(int) * number of entries
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173 return prefix + totalDataLen;
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174 }
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175
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176 /*package-local*/ void serialize(DataSerializer out) throws IOException {
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177 for (int i = 0, x = data.size(); i < x; i++) {
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178 final int start = starts.get(i);
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179 final int end = ends.get(i);
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180 byte[] d = data.get(i);
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181 out.writeInt(start, end, d.length);
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182 out.write(d, 0, d.length);
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183 }
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184 }
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185
330
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186 private void add(Patch p, int i) {
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187 add(p.starts.get(i), p.ends.get(i), p.data.get(i));
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188 }
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189
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190 /*package-local*/ void add(int start, int end, byte[] d) {
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191 if (start == end && d.length == 0) {
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192 System.currentTimeMillis();
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193 return;
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194 }
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195 int last;
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196 if (shallNormalize && (last = starts.size()) > 0) {
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197 last--;
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198 if (ends.get(last) == start) {
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199 byte[] d1 = data.get(last);
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200 byte[] nd;
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201 if (d1.length > 0 && d.length > 0) {
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202 nd = new byte[d1.length + d.length];
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203 System.arraycopy(d1, 0, nd, 0, d1.length);
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204 System.arraycopy(d, 0, nd, d1.length, d.length);
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205 } else {
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206 nd = d1.length == 0 ? d : d1 ;
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207 }
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208 ends.set(last, end);
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209 data.set(last, nd);
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210 return;
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211 }
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212 // fall-through
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213 }
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214 starts.add(start);
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215 ends.add(end);
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216 data.add(d);
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217 }
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218
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219 // copies [start..end) bytes from the d
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220 private static byte[] subarray(byte[] d, int start, int end) {
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221 byte[] r = new byte[end-start];
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222 System.arraycopy(d, start, r, 0, r.length);
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223 return r;
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224 }
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225
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226 /**
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227 * Modify this patch with subsequent patch
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228 */
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229 public /*SHALL BE PUBLIC ONCE TESTING ENDS*/ Patch apply(Patch another) {
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230 Patch r = new Patch(shallNormalize);
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231 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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232 // in the patched text, iow, directly comparable with respective indexes from the newer patch.
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233 int p1EntryStart = 0, p1EntryEnd = 0, p1EntryLen = 0;
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234 byte[] p1Data = null;
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235 boolean insideP1entry = false;
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236 int p2 = 0, p1 = 0;
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237 final int p2Max = another.count(), p1Max = this.count();
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238 L0: for (; p2 < p2Max; p2++) {
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239 int p2EntryStart = another.starts.get(p2);
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240 int p2EntryEnd = another.ends.get(p2);
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241 final int p2EntryRange = p2EntryEnd - p2EntryStart;
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242 final byte[] p2Data = another.data.get(p2);
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243 boolean insideP2entry = false;
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244 // when we iterate p1 elements within single p2, we need to remember where p2
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245 // shall ultimately start in terms of p1
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246 int p2EntrySavedStart = -1;
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247 ///
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248
330
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249 L1: while (p1 < p1Max) {
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250 if (!insideP1entry) {
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251 p1EntryStart = starts.get(p1);
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252 p1EntryEnd = ends.get(p1);
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253 p1Data = data.get(p1);
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254 p1EntryLen = p1Data.length;
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255 }// else keep values
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256
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257 final int p1EntryDelta = p1EntryLen - (p1EntryEnd - p1EntryStart); // number of actually inserted(+) or deleted(-) chars
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258 final int p1EntryAppliedStart = p1TotalAppliedDelta + p1EntryStart;
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259 final int p1EntryAppliedEnd = p1EntryAppliedStart + p1EntryLen; // end of j'th patch entry in the text which is source for p2
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260
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261 if (insideP2entry) {
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262 if (p2EntryEnd <= p1EntryAppliedStart) {
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263 r.add(p2EntrySavedStart, p2EntryEnd - p1TotalAppliedDelta, p2Data);
330
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264 insideP2entry = false;
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265 continue L0;
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266 }
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267 if (p2EntryEnd >= p1EntryAppliedEnd) {
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268 // 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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269 // 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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270 insideP1entry = false;
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271 p1++;
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272 p1TotalAppliedDelta += p1EntryDelta;
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273 continue L1;
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274 }
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275 // p1EntryAppliedStart < p2EntryEnd < p1EntryAppliedEnd
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276 // can add up to p1EntryEnd here (not only to p1EntryStart), but decided
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277 // to leave p1 intact here, to avoid delta/range recalculation
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278 r.add(p2EntrySavedStart, p1EntryStart, p2Data);
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279 // consume part of p1 overlapped by current p2
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280 final int p1DataPartShift = p2EntryEnd - p1EntryAppliedStart;
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281 // p2EntryEnd < p1EntryAppliedEnd ==> p2EntryEnd < p1EntryAppliedStart + p1EntryLen
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282 // ==> p2EntryEnd - p1EntryAppliedStart < p1EntryLen
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283 assert p1DataPartShift < p1EntryLen;
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284 p1EntryLen -= p1DataPartShift;
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285 p1Data = subarray(p1Data, p1DataPartShift, p1Data.length);
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286 p1TotalAppliedDelta += p1DataPartShift;
330
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287 insideP1entry = true;
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288 insideP2entry = false;
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289 continue L0;
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290 }
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291
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292 if (p1EntryAppliedStart < p2EntryStart) {
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293 if (p1EntryAppliedEnd <= p2EntryStart) { // p1EntryAppliedEnd in fact index of the first char *after* patch
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294 // completely independent, copy and continue
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295 r.add(p1EntryStart, p1EntryEnd, p1Data);
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296 insideP1entry = false;
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297 p1++;
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298 // fall-through to get p1TotalAppliedDelta incremented
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299 } else { // SKETCH: II or III - p2 start inside p1 range
330
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300 // remember, p1EntryDelta may be negative
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301 // shall break j'th entry into few
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302 // fix p1's end/length
583
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303 // p1EntryAppliedStart < p2EntryStart < p1EntryAppliedEnd, or, alternatively
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304 // p2EntryStart is from (p1EntryAppliedStart .. p1EntryAppliedStart + p1EntryLen)
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305 int p1DataPartEnd = p2EntryStart - p1EntryAppliedStart;
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306 assert p1DataPartEnd < p1EntryLen;
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307 r.add(p1EntryStart, p1EntryEnd, subarray(p1Data, 0, p1DataPartEnd));
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308 if (p2EntryEnd <= p1EntryAppliedEnd) { // p2 fits completely into p1
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309 r.add(p1EntryEnd, p1EntryEnd, p2Data);
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310 // p2 consumed, p1 has p1EntryLen - p1DataPartEnd - p2EntryRange bytes left to *insert*
330
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diff changeset
311 insideP1entry = true;
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312 p1EntryStart = p1EntryEnd;
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313 p1EntryLen -= p1DataPartEnd;
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314 p1EntryLen -= p2EntryRange;
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315 // p2EntryEnd <= p1EntryAppliedEnd ==> p2EntryEnd <= p1EntryAppliedStart + p1EntryLen
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316 // -p2EntryStart ==> p2EntryRange <= p1EntryAppliedStart-p2EntryStart + p1EntryLen
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317 // p1EntryAppliedStart-p2EntryStart = -p1DataPartEnd ==> p2EntryRange <= p1EntryLen - p1DataEndPart
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318 // +p1DataEndPart ==> p2EntryRange + p1DataEndPart <= p1EntryLen
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319 assert p1EntryLen >= 0;
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320 // p1EntryLen==0 with insideP1entry == true is nor really good here (gives empty patch elements x;x;0),
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321 // however changing <= to < in p2EntryEnd <= p1EntryAppliedEnd above leads to errors
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322 p1Data = subarray(p1Data, p1DataPartEnd+p2EntryRange, p1Data.length);
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diff changeset
323 // augment total delta with p1EntryDelta part already consumed (p1EntryLen is pure insertion left for the next step)
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324 p1TotalAppliedDelta += (p1EntryDelta - p1EntryLen);
330
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diff changeset
325 continue L0;
583
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326 } else {
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327 // p1 is consumed, take next
330
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328 insideP1entry = false;
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329 p1++;
583
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330 insideP2entry = true;
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331 p2EntrySavedStart = p1EntryEnd; // this is how far we've progressed in p1
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diff changeset
332 // fall-through to get p1TotalAppliedDelta updated with consumed p1
330
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diff changeset
333 }
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334 }
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335 } else { // p1EntryAppliedStart >= p2EntryStart
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diff changeset
336 if (p2EntryEnd < p1EntryAppliedStart) {
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diff changeset
337 // newer patch completely fits between two older patches
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diff changeset
338 r.add(p2EntryStart - p1TotalAppliedDelta, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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diff changeset
339 // SHALL NOT increment p1TotalAppliedDelta as we didn't use any of p1
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diff changeset
340 continue L0; // next p2
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341 } else { // p2EntryEnd >= p1EntryAppliedStart
583
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diff changeset
342 // SKETCH: I or IV:
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343 // p2 start is outside of p1 range.
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344 //
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345 // p2DataPartEnd: this is how many bytes prior to p1EntryStart is replaced by p2Data
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diff changeset
346 int p2DataPartEnd = p1EntryAppliedStart - p2EntryStart;
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diff changeset
347 if (p2EntryEnd < p1EntryAppliedEnd) {
330
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parents: 329
diff changeset
348 // SKETCH: I: copy p2, strip p1 to start from p2EntryEnd, next i (p2)
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diff changeset
349 insideP1entry = true;
583
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diff changeset
350 // replace whole p1 (extended to the left by (p2 \ p1) front bytes)
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parents: 534
diff changeset
351 r.add(p1EntryStart - p2DataPartEnd, p1EntryEnd, p2Data);
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diff changeset
352 p1EntryStart = p1EntryEnd;
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diff changeset
353 // see how much of p1 is left for insertion
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diff changeset
354 int p1DataPartEnd = p2EntryEnd - p1EntryAppliedStart; // #1
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parents: 534
diff changeset
355 // Similar, although incorrect: p1DataPartEnd == p2Data.length - p2DataPartEnd; // #2
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parents: 534
diff changeset
356 // #1(p2EntryStart + p2DataLen) - p1EntryAppliedStart
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parents: 534
diff changeset
357 // #2 p2DataLen - (p1EntryAppliedStart - p2EntryStart)
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parents: 534
diff changeset
358 // but this works only in assumption that p2EntryEnd-p2EntryStart == p2Data.length
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diff changeset
359 //
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diff changeset
360 // p1EntryAppliedStart <= p2EntryEnd < p1EntryAppliedStart + p1EntryLen
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parents: 534
diff changeset
361 // -p1EntryAppliedStart (to compare against p1DataPartEnd) ==> 0 <= p1DataPartEnd < p1EntryLen
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diff changeset
362 assert p1DataPartEnd < p1EntryLen;
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diff changeset
363 assert p1DataPartEnd >= 0;
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diff changeset
364 p1EntryLen -= p1DataPartEnd;
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diff changeset
365 p1Data = subarray(p1Data, p1DataPartEnd, p1Data.length);
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diff changeset
366
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diff changeset
367 // p1TotalAppliedDelta XXX
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diff changeset
368 p1TotalAppliedDelta += (p1EntryDelta - p1EntryLen);
330
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parents: 329
diff changeset
369 continue L0; // next p2;
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370 } else {
583
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diff changeset
371 // p2EntryEnd >= p1EntryAppliedEnd
330
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diff changeset
372 // SKETCH IV: skip (rest of) p1 completely, continue the same unless found p1 with start or end past p2EntryEnd.
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diff changeset
373 insideP1entry = false;
583
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diff changeset
374 // p1 consumed
330
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diff changeset
375 p1++;
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376 insideP2entry = true;
583
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diff changeset
377 // extend to the left of p1 by p2 \ p1 front bytes
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diff changeset
378 p2EntrySavedStart = p1EntryStart - p2DataPartEnd;
330
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parents: 329
diff changeset
379 // fall-through to get p1TotalAppliedDelta incremented
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diff changeset
380 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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381 }
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382 }
330
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diff changeset
383 p1TotalAppliedDelta += p1EntryDelta;
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parents: 329
diff changeset
384 } // while (p1 < p1Max)
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diff changeset
385 {
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diff changeset
386 // no more p1 entries, shall close p2 (if it's handled, code above jumps directly to L0)
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parents: 329
diff changeset
387 // regardless of whether insideP2 is .t
583
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388 int s = p2EntrySavedStart != -1 ? p2EntrySavedStart : p2EntryStart - p1TotalAppliedDelta;
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389 // p2EntrySavedStart != -1 when we started p2 entry processing, but not completed
330
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390 // 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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391 r.add(s, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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392 }
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393 }
330
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394 if (p1 < p1Max && insideP1entry) {
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395 r.add(p1EntryStart, p1EntryEnd, p1Data);
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396 p1++;
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397 }
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398 while (p1 < p1Max) {
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399 r.add(this, p1);
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400 p1++;
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401 };
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402 return r;
329
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403 }
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404
583
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405 /**
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406 * Combine consecutive regions into one.
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407 * XXX NOW only combines two subsequent regions, seems enough for quick test
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408 * @return <code>this</code> or new instance of consecutive regions found
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409 */
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410 public Patch normalize() {
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411 Patch rv = null;
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412 for (int i = 1, x = data.size(); i < x; i++) {
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413 if (starts.get(i) == ends.get(i-1)) {
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414 if (rv == null) {
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415 rv = new Patch();
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416 rv.copyOf(this, 0, i-1);
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417 // } else if (ends.get(i-1) == rv.ends.get(rv.ends.size()-1)) {
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418 // // "JUST IN CASE" code, i++ below prevents us from getting here
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419 // // if the last region is the one already merged,
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420 // // ignore this occurrence (otherwise data(i-1) would get copied again)
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421 // continue;
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422 }
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423 byte[] d1 = data.get(i-1);
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424 byte[] d = data.get(i);
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425 byte[] nd;
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426 if (d1.length > 0 && d.length > 0) {
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427 nd = new byte[d1.length + d.length];
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428 System.arraycopy(d1, 0, nd, 0, d1.length);
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429 System.arraycopy(d, 0, nd, d1.length, d.length);
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430 } else {
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431 nd = d1.length == 0 ? d : d1 ;
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432 }
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433 rv.add(starts.get(i-1), ends.get(i), nd);
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434 i++; // skip i-th element (effectively means we detect only pairs)
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435 // without this ++, element(i-1) is added to rv once "else" below is hit on the next step
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436 } else {
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437 if (rv != null) {
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438 rv.add(this, i-1);
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439 }
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440 }
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441 }
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442 if (rv == null) {
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443 return this;
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444 } else {
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445 int last = count() - 1;
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446 if (starts.get(last) != ends.get(last-1)) {
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447 rv.add(this, last);
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448 }
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449 }
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450 return rv;
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451 }
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452
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453 private void copyOf(Patch another, int fromIndex, int upToIndex) {
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454 while(fromIndex < upToIndex) {
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455 add(another, fromIndex++);
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456 }
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457 }
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458
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459 public class PatchDataSource implements DataSerializer.DataSource {
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460
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461 public void serialize(DataSerializer out) throws IOException {
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462 Patch.this.serialize(out);
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463 }
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464
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465 public int serializeLength() {
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466 return Patch.this.serializedLength();
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467 }
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468 }
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469 }