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annotate src/org/tmatesoft/hg/internal/RangePairSeq.java @ 681:4f93bbc73b64

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Do not instantiate thousands of small arrays(numerous readInt/readLong calls)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:48:05 +0200
parents cce0387c6041
children
rev   line source
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1 /*
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2 * Copyright (c) 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.util.Formatter;
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20
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21 /**
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22 * Sequence of range pairs (denoted origin and target), {originStart, targetStart, length}, tailored for diff/annotate
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 public final class RangePairSeq {
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28 private final IntSliceSeq ranges = new IntSliceSeq(3);
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29
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30 public void add(int start1, int start2, int length) {
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31 int count = ranges.size();
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32 if (count > 0) {
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33 int lastS1 = ranges.get(--count, 0);
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34 int lastS2 = ranges.get(count, 1);
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35 int lastLen = ranges.get(count, 2);
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36 if (start1 == lastS1 + lastLen && start2 == lastS2 + lastLen) {
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37 // new range continues the previous one - just increase the length
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38 ranges.set(count, lastS1, lastS2, lastLen + length);
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39 return;
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40 }
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41 }
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42 ranges.add(start1, start2, length);
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43 }
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44
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45 public void clear() {
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46 ranges.clear();
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47 }
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48
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49 public int size() {
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50 return ranges.size();
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51 }
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52
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53 /**
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54 * find out line index in the target that matches specified origin line
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55 */
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56 public int mapLineIndex(int ln) {
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57 for (IntTuple t : ranges) {
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58 int s1 = t.at(0);
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59 if (s1 > ln) {
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60 return -1;
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61 }
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62 int l = t.at(2);
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63 if (s1 + l > ln) {
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64 int s2 = t.at(1);
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65 return s2 + (ln - s1);
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66 }
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67 }
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68 return -1;
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69 }
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70
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71 /**
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72 * find out line index in origin that matches specified target line
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73 */
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74 public int reverseMapLine(int targetLine) {
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75 for (IntTuple t : ranges) {
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76 int ts = t.at(1);
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77 if (ts > targetLine) {
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78 return -1;
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79 }
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80 int l = t.at(2);
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81 if (ts + l > targetLine) {
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82 int os = t.at(0);
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83 return os + (targetLine - ts);
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84 }
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85 }
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86 return -1;
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87 }
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88
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89 public RangePairSeq intersect(RangePairSeq target) {
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90 RangePairSeq v = new RangePairSeq();
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91 for (IntTuple t : ranges) {
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92 int originLine = t.at(0);
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93 int targetLine = t.at(1);
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94 int length = t.at(2);
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95 int startTargetLine = -1, startOriginLine = -1, c = 0;
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96 for (int j = 0; j < length; j++) {
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97 int lnInFinal = target.mapLineIndex(targetLine + j);
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98 if (lnInFinal == -1 || (startTargetLine != -1 && lnInFinal != startTargetLine + c)) {
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99 // the line is not among "same" in ultimate origin
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100 // or belongs to another/next "same" chunk
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101 if (startOriginLine == -1) {
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102 continue;
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103 }
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104 v.add(startOriginLine, startTargetLine, c);
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105 c = 0;
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106 startOriginLine = startTargetLine = -1;
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107 // fall-through to check if it's not complete miss but a next chunk
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108 }
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109 if (lnInFinal != -1) {
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110 if (startOriginLine == -1) {
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111 startOriginLine = originLine + j;
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112 startTargetLine = lnInFinal;
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113 c = 1;
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114 } else {
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115 // lnInFinal != startTargetLine + s is covered above
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116 assert lnInFinal == startTargetLine + c;
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117 c++;
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118 }
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119 }
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120 }
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121 if (startOriginLine != -1) {
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122 assert c > 0;
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123 v.add(startOriginLine, startTargetLine, c);
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124 }
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125 }
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126 return v;
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127 }
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128
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129 // true when specified line in origin is equal to a line in target
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130 public boolean includesOriginLine(int ln) {
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131 return includes(ln, 0);
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132 }
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133
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134 // true when specified line in target is equal to a line in origin
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135 public boolean includesTargetLine(int ln) {
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136 return includes(ln, 1);
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137 }
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138
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139 private boolean includes(int ln, int o) {
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140 for (IntTuple t : ranges) {
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141 int rangeStart = t.at(o);
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142 if (rangeStart > ln) {
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143 return false;
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144 }
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145 int rangeLen = t.at(2);
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146 if (rangeStart + rangeLen > ln) {
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147 return true;
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148 }
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149 }
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150 return false;
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151 }
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152
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153 public CharSequence dump() {
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154 StringBuilder sb = new StringBuilder();
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155 Formatter f = new Formatter(sb);
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156 for (IntTuple t : ranges) {
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157 int s1 = t.at(0);
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158 int s2 = t.at(1);
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159 int len = t.at(2);
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160 f.format("[%d..%d) == [%d..%d); ", s1, s1 + len, s2, s2 + len);
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161 }
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162 return sb;
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163 }
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164
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165 @Override
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166 public String toString() {
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167 return String.format("RangeSeq[%d]:%s", size(), dump());
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168 }
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169 }