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annotate src/org/tmatesoft/hg/internal/Patch.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 9747a786a34d
children 7f136a3fa671
rev   line source
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1 /*
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2 * Copyright (c) 2011 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, in Changelog group description
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25 *
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26 * range [start..end] in original source gets replaced with data of length (do not keep, use data.length instead)
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27 * range [end(i)..start(i+1)] is copied from the source
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public final class Patch {
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33 private final IntVector starts, ends;
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34 private final ArrayList<byte[]> data;
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35
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36 private static byte[] generate(int c) {
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37 byte[] rv = new byte[c];
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38 for (int i = 0; i < c; i++) {
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39 byte x = (byte) ('a' + i);
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40 rv[i] = x;
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41 }
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42 return rv;
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43 }
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44
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45 public static void main(String[] args) {
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46 Patch p1 = new Patch(), p2 = new Patch();
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47 // simple cases (one element in either patch)
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48 // 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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49 // II: (1,10,7) & (3,15,15) insideP2 = true and no more p1 entries
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50 // II: (1,1,10) & (3,11,15)
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51 // independent: (1,10,10) & (15,25,10); (15, 25, 10) & (1, 10, 10)
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52 // I: (15, 25, 10) & (10, 20, 10). result: [10, 20, 10] [20, 25, 5]
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53 // IV: (15, 25, 10) & (10, 30, 20)
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54 //
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55 // cycle with insideP2
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56 //
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57 // cycle with insideP1
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58 //
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59 // multiple elements in patches (offsets)
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60 p1.add(15, 25, generate(10));
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61 p2.add(10, 30, generate(20));
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62 System.out.println("p1: " + p1);
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63 System.out.println("p2: " + p2);
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64 Patch r = p1.apply(p2);
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65 System.out.println("r: " + r);
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66 }
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67
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68 public Patch() {
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69 starts = new IntVector();
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70 ends = new IntVector();
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71 data = new ArrayList<byte[]>();
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72 }
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73
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74 public String toString() {
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75 StringBuilder sb = new StringBuilder();
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76 Formatter f = new Formatter(sb);
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77 for (int i = 0; i < count(); i++) {
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78 f.format("[%d, %d, %d] ", starts.get(i), ends.get(i), data.get(i).length);
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79 }
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80 return sb.toString();
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81 }
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82
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83 public int count() {
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84 return data.size();
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85 }
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86
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87 // number of bytes this patch will add (or remove, if negative) from the base revision
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88 private int patchSizeDelta() {
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89 int rv = 0;
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90 int prevEnd = 0;
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91 for (int i = 0, x = data.size(); i < x; i++) {
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92 final int start = starts.get(i);
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93 final int len = data.get(i).length;
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94 rv += start - prevEnd; // would copy from original
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95 rv += len; // and add new
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96 prevEnd = ends.get(i);
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97 }
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98 rv -= prevEnd;
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99 return rv;
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100 }
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101
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102 public byte[] apply(DataAccess baseRevisionContent, int outcomeLen) throws IOException {
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103 if (outcomeLen == -1) {
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104 outcomeLen = baseRevisionContent.length() + patchSizeDelta();
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105 }
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106 int prevEnd = 0, destIndex = 0;
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107 byte[] rv = new byte[outcomeLen];
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108 for (int i = 0, x = data.size(); i < x; i++) {
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109 final int start = starts.get(i);
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110 baseRevisionContent.seek(prevEnd);
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111 // copy source bytes that were not modified (up to start of the record)
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112 baseRevisionContent.readBytes(rv, destIndex, start - prevEnd);
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113 destIndex += start - prevEnd;
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114 // insert new data from the patch, if any
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115 byte[] d = data.get(i);
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116 System.arraycopy(d, 0, rv, destIndex, d.length);
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117 destIndex += d.length;
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118 prevEnd = ends.get(i);
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119 }
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120 baseRevisionContent.seek(prevEnd);
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121 // copy everything in the source past last record's end
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122 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - prevEnd));
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123 return rv;
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124 }
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125
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126 public void clear() {
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127 starts.clear();
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128 ends.clear();
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129 data.clear();
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130 }
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131
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132 /**
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133 * Initialize instance from stream. Any previous patch information (i.e. if instance if reused) is cleared first.
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134 * Read up to the end of DataAccess and interpret data as patch records.
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135 */
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136 public void read(DataAccess da) throws IOException {
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137 clear();
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138 while (!da.isEmpty()) {
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139 readOne(da);
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140 }
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141 }
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142
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143 /**
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144 * Caller is responsible to ensure stream got some data to read
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145 */
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146 public void readOne(DataAccess da) throws IOException {
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147 int s = da.readInt();
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148 int e = da.readInt();
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149 int len = da.readInt();
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150 byte[] src = new byte[len];
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151 da.readBytes(src, 0, len);
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152 starts.add(s);
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153 ends.add(e);
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154 data.add(src);
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155 }
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156
330
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157 private void add(Patch p, int i) {
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158 add(p.starts.get(i), p.ends.get(i), p.data.get(i));
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159 }
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160
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161 private void add(int start, int end, byte[] d) {
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162 starts.add(start);
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163 ends.add(end);
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164 data.add(d);
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165 }
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166
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167 private static byte[] subarray(byte[] d, int start, int end) {
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168 byte[] r = new byte[end-start+1];
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169 System.arraycopy(d, start, r, 0, r.length);
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170 return r;
329
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171 }
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172
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173 /**
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174 * Modify this patch with subsequent patch
330
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175 */
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176 private /*SHALL BE PUBLIC ONCE TESTING ENDS*/ Patch apply(Patch another) {
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177 Patch r = new Patch();
330
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178 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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179 // in the patched text, iow, directly comparable with respective indexes from the newer patch.
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180 int p1EntryStart = 0, p1EntryEnd = 0, p1EntryLen = 0;
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181 byte[] p1Data = null;
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182 boolean insideP1entry = false;
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183 int p2 = 0, p1 = 0;
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184 final int p2Max = another.count(), p1Max = this.count();
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185 L0: for (; p2 < p2Max; p2++) {
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186 int p2EntryStart = another.starts.get(p2);
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187 int p2EntryEnd = another.ends.get(p2);
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188 final int p2EntryRange = p2EntryEnd - p2EntryStart;
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189 final byte[] p2Data = another.data.get(p2);
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190 boolean insideP2entry = false;
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191 int p2EntryStartOffset = -1;
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192 ///
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193 p1EntryStart = p1EntryEnd = p1EntryLen = 0;
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194 p1Data = null;
329
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195
330
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196 L1: while (p1 < p1Max) {
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197 if (!insideP1entry) {
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198 p1EntryStart = starts.get(p1);
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199 p1EntryEnd = ends.get(p1);
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200 p1Data = data.get(p1);
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201 p1EntryLen = p1Data.length;
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202 }// else keep values
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203
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204 final int p1EntryDelta = p1EntryLen - (p1EntryEnd - p1EntryStart); // number of actually inserted(+) or deleted(-) chars
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205 final int p1EntryAppliedStart = p1TotalAppliedDelta + p1EntryStart;
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206 final int p1EntryAppliedEnd = p1EntryAppliedStart + p1EntryLen; // end of j'th patch entry in the text which is source for p2
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207
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208 if (insideP2entry) {
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209 if (p2EntryEnd < p1EntryAppliedStart) {
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210 r.add(p2EntryStart - p2EntryStartOffset, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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211 insideP2entry = false;
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212 continue L0;
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213 }
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214 if (p2EntryEnd >= p1EntryAppliedEnd) {
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215 // 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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216 // 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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217 insideP1entry = false;
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218 p1++;
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219 p1TotalAppliedDelta += p1EntryDelta;
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220 continue L1;
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221 }
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222 // p1EntryAppliedStart <= p2EntryEnd < p1EntryAppliedEnd
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223 r.add(p2EntryStart - p2EntryStartOffset, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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224 p1EntryStart = p2EntryEnd - p1TotalAppliedDelta;
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225 final int p1DataPartShift = p2EntryEnd - p1EntryAppliedStart + 1;
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226 if (p1DataPartShift >= p1EntryLen) {
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227 p1EntryLen = 0;
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228 p1Data = new byte[0];
329
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229 } else {
330
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230 p1EntryLen -= p1DataPartShift;
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231 p1Data = subarray(p1Data, p1DataPartShift, p1Data.length);
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232 }
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233 insideP1entry = true;
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234 insideP2entry = false;
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235 continue L0;
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236 }
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237
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238 if (p1EntryAppliedStart < p2EntryStart) {
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239 if (p1EntryAppliedEnd <= p2EntryStart) { // p1EntryAppliedEnd in fact index of the first char *after* patch
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240 // completely independent, copy and continue
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241 r.add(p1EntryStart, p1EntryEnd, p1Data);
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242 insideP1entry = false;
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243 p1++;
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244 // fall-through to get p1TotalAppliedDelta incremented
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245 } else { // SKETCH: II or III
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246 // remember, p1EntryDelta may be negative
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247 // shall break j'th entry into few
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248 // fix p1's end/length
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249 // p1EntryAppliedStart < p2EntryStart < p1EntryAppliedEnd
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250 int s = p2EntryStart - p1TotalAppliedDelta; // p2EntryStart in p1 scale. Is within p1 range
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251 if (s > p1EntryEnd) {
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252 s = p1EntryEnd;
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253 }
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254 int p1DataPartEnd = p2EntryStart - p1EntryAppliedStart; // index, not count. <= (p1EntryEnd-p1EntryStart).
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255 // add what left from p1
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256 if (p1DataPartEnd < p1EntryLen) {
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257 r.add(p1EntryStart, s, subarray(p1Data, 0, p1DataPartEnd));
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258 } else {
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259 p1DataPartEnd = p1EntryLen-1; // record factual number of p1 bytes we consumed.
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260 r.add(p1EntryStart, s, p1Data);
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261 }
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262 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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263 p1EntryLen -= (p1DataPartEnd+1);
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264 if (p2EntryEnd < p1EntryAppliedEnd) {
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265 // SKETCH: III
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266 insideP1entry = true;
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267 // p2 completely fits into changes of p1
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268 int e = p2EntryEnd - p1TotalAppliedDelta; // p2EntryEnd in p1 scale
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269 if (e > p1EntryEnd) {
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270 // 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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271 e = p1EntryEnd;
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272 }
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273 r.add(s, e, p2Data); // add p2
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274 // modify p1 leftover
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275 p1EntryStart = e;
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276 if (p2EntryRange >= p1EntryLen) {
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277 p1EntryLen = 0;
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278 p1Data = new byte[0];
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279 } else {
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280 p1Data = subarray(p1Data, p1DataPartEnd + p2EntryRange, p1Data.length-1 /*up to the last one*/);
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281 p1EntryLen -= p2EntryRange;
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282 }
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283 // p2 is handled, but there are leftovers of p1
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284 continue L0;
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285 } else { // p2EntryEnd >= p1EntryAppliedEnd
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286 // SKETCH: II
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287 insideP1entry = false;
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288 p1++;
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289 if (p1EntryAppliedStart + p1EntryDelta >= p2EntryEnd) {
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290 // here we know next p1 entry would be past p2 entry and thus can put p2 right away
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291 r.add(p2EntryStart - p1TotalAppliedDelta, p1EntryEnd, p2Data);
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292 p1TotalAppliedDelta += p1EntryDelta;
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293 continue L0;
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294 } else {
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295 // there are chances there are more p1 entries till p2 ends
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296 insideP2entry = true;
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297 p2EntryStartOffset = p1TotalAppliedDelta;
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298 // p2EntryEnd is past delta, no chances for p1Data leftovers to be in use
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299 // 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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300 // fall-through to get p1TotalAppliedDelta incremented;
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301 }
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302 }
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303 }
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304 } else { // p1EntryAppliedStart >= p2EntryStart
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305 if (p2EntryEnd < p1EntryAppliedStart) {
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306 // newer patch completely fits between two older patches
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307 r.add(p2EntryStart - p1TotalAppliedDelta, p2EntryEnd - p1TotalAppliedDelta, p2Data);
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308 // SHALL NOT increment p1TotalAppliedDelta as we didn't use any of p1
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309 continue L0; // next p2
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310 } else { // p2EntryEnd >= p1EntryAppliedStart
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311 // SKETCH: I or IV
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312 // p2EntryEnd is either < p1EntryAppliedEnd or past it
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diff changeset
313 if (p2EntryEnd <= p1EntryAppliedEnd) {
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314 // SKETCH: I: copy p2, strip p1 to start from p2EntryEnd, next i (p2)
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315 insideP1entry = true;
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316 int e = p2EntryEnd - p1TotalAppliedDelta;
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317 if (e > p1EntryEnd) {
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diff changeset
318 e = p1EntryEnd; // added by analogy with above. Is needed?
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319 }
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320 r.add(p2EntryStart - p1TotalAppliedDelta, e, p2Data);
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321 p1EntryStart = e;
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322 int p1DataShift = p2EntryEnd - p1EntryAppliedStart;
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diff changeset
323 if (p1DataShift >= p1EntryLen) {
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324 p1EntryLen = 0;
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325 p1Data = new byte[0];
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326 } else {
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327 p1EntryLen -= p1DataShift;
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diff changeset
328 p1Data = subarray(p1Data, p1DataShift, p1Data.length - 1);
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329 }
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330 // p1TotalAppliedDelta would get incremented once this modified p1 is handled
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diff changeset
331 continue L0; // next p2;
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332 } else {
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333 // p2EntryEnd > p1EntryAppliedEnd
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334 // 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
335 insideP1entry = false;
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336 p1++;
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337 insideP2entry = true;
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338 p2EntryStartOffset = p1TotalAppliedDelta;
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diff changeset
339 // fall-through to get p1TotalAppliedDelta incremented
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340 }
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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341 }
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342 }
330
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343 p1TotalAppliedDelta += p1EntryDelta;
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344 } // while (p1 < p1Max)
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345 {
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346 // no more p1 entries, shall close p2 (if it's handled, code above jumps directly to L0)
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347 // regardless of whether insideP2 is .t
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348 int s = p2EntryStart;
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349 // p2EntryStartOffset != -1 when we started p2 entry processing, but not completed
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diff changeset
350 // 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
351 s -= p2EntryStartOffset == -1 ? p1TotalAppliedDelta : p2EntryStartOffset;
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diff changeset
352 r.add(s, p2EntryEnd - p1TotalAppliedDelta, p2Data);
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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353 }
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354 }
330
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diff changeset
355 if (p1 < p1Max && insideP1entry) {
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diff changeset
356 r.add(p1EntryStart, p1EntryEnd, p1Data);
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diff changeset
357 p1++;
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358 }
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diff changeset
359 while (p1 < p1Max) {
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diff changeset
360 r.add(this, p1);
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361 p1++;
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362 };
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363 return r;
329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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364 }
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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365 }