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annotate FileDBLink.cpp @ 44:7348d4efa4f6

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More testing for BitDecoder.
author Tom Fredrik Blenning Klaussen <bfg@blenning.no>
date Mon, 10 Sep 2012 19:18:30 +0200
parents f711ddb56ae7
children 247adcbbaf8b
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1 #include "FileDBLink.hpp"
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2
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3 #include "EditDistance.hpp"
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4
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5 #include "Exception/PermissionException.hpp"
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6
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7 #include <QtCore/QtConcurrentMap>
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8
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9 #include <algorithm>
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10 #include <cassert>
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11 #include <functional>
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12 #include <iostream>
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14 #include <boost/bind.hpp>
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15
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16 void FileDBLink::updateIfModified(const QString& path)
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17 {
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18 QFileInfo fileinfo(path);
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19 FileDBLink::DBStatus status = existsWithMtime(path, fileinfo.lastModified());
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20
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21 switch (status) {
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22 case FileDBLink::NONE: {
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23 addFile(fileinfo);
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24 break;
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25 }
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26 case FileDBLink::MTIME_DIFFERENT: {
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27 updateFile(fileinfo);
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28 }
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29 default: {
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30 }
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31 }
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32 }
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34 void FileDBLink::addFile(const QFileInfo& fileinfo)
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35 {
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36 addFile(fileinfo.absoluteFilePath(), fileinfo.size(), fileinfo.lastModified());
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37 }
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38
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39 QByteArray FileDBLink::computeHash(const QString& path, QCryptographicHash::Algorithm algorithm)
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40 {
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41 const static uint buffersize = 32768;
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42 QCryptographicHash hash(algorithm);
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43 QFile file(path);
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44 if ( file.open( QIODevice::ReadOnly ) ) {
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45 while(!file.atEnd()){
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46 hash.addData(file.read(buffersize));
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47 }
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48 }
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49 else {
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50 QString errorMsg = path + ": " + file.errorString();
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51
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52 switch (file.error()) {
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53 case QFile::PermissionsError:
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54 throw PermissionException(errorMsg);
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55 default:
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56 throw IOException(errorMsg);
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57 }
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58 }
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59 return hash.result();
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60 }
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63 void FileDBLink::addFile(const QString& path, qint64 size, const QDateTime& lastModified)
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64 {
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65 addFile(path, size, lastModified, computeHash(path));
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66 }
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67
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68 void FileDBLink::updateFile(const QFileInfo& fileinfo)
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69 {
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70 updateFile(fileinfo.absoluteFilePath(), fileinfo.size(), fileinfo.lastModified());
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71 }
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72
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73 void FileDBLink::updateFile(const QString& path, qint64 size, const QDateTime& lastModified)
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74 {
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75 updateFile(path, size, lastModified, computeHash(path));
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76 }
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77
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78 const QList<QSharedPointer<FileDBLink::DBInfo> > FileDBLink::sortOn(const QString& prefix, SORTORDER order, bool extended)
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79 {
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80 QList<QSharedPointer<DBInfo> > list = (extended) ? computedValues(prefix) : values(prefix);
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81
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82 switch (order) {
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83 case PATH:
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84 {
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85 QList<QSharedPointer<FileDBLink::DBInfo> > oList;
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86 foreach(QSharedPointer<DBInfo> info, list) {
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87 oList.push_back(info);
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88 }
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89 return oList;
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90 }
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91 case SIZE:
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92 {
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93 QMultiMap<quint64, QSharedPointer<DBInfo> > oList;
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94 foreach(QSharedPointer<DBInfo> info, list) {
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95 oList.insert(info->size(), info);
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96 }
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97 return oList.values();
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98 }
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99 case MTIME:
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100 {
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101 QMultiMap<QDateTime, QSharedPointer<DBInfo> > oList;
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102 foreach(QSharedPointer<DBInfo> info, list) {
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103 oList.insert(info->mtime(), info);
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104 }
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105 return oList.values();
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106 }
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107 case CHECKSUM:
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108 {
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109 QMultiMap<QByteArray, QSharedPointer<DBInfo> > oList;
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110 foreach(QSharedPointer<DBInfo> info, list) {
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111 oList.insert(info->checksum(), info);
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112 }
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113 return oList.values();
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114 }
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115 case EDIT:
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116 {
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117 assert(extended);
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118 QMultiMap<int, QSharedPointer<DBInfo> > oList;
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119 foreach(QSharedPointer<DBInfo> info, list) {
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120 QSharedPointer<ExtendedDBInfo> ptr;
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121 ptr = info.dynamicCast<ExtendedDBInfo>();
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122 oList.insert(ptr->editDistance(), info);
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123 }
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124 return oList.values();
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125
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126 }
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127 }
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128 abort();
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129 }
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130
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131 QSharedPointer<FileDBLink::DBInfo> FileDBLink::computedValue(const QSharedPointer<DBInfo>& info,
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132 const QList<QSharedPointer<DBInfo> >& entries)
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133 {
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134 QString p1 = info->name();
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135 int minDist = 100000;
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136 QString other;
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137 for (QList<QSharedPointer<DBInfo> >::const_iterator it2 = entries.begin();
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138 it2 != entries.end(); ++it2) {
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139 if (info == *it2)
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140 continue;
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141 QString p2 = (*it2)->name();
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142 int dist = EditDistance::Compute(p1, p2, false);
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143 if (dist < minDist) {
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144 minDist = dist;
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145 other = (*it2)->path();
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146 }
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147 }
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148 return QSharedPointer<DBInfo>(new ExtendedDBInfo(*info, other, minDist));
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149 }
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150
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151 const QList<QSharedPointer<FileDBLink::DBInfo> > FileDBLink::computedValues(const QString& prefix) const
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152 {
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153 QList<QSharedPointer<DBInfo> > list;
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154 QList<QSharedPointer<DBInfo> > entries = values(prefix);
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155
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156 #if 1
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157 list = QtConcurrent::blockingMapped(entries, boost::bind( &FileDBLink::computedValue, _1, entries));
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158 #else
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159 for (QList<QSharedPointer<DBInfo> >::const_iterator it1 = entries.begin();
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160 it1 != entries.end(); ++it1) {
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161 QSharedPointer<DBInfo> ext = computedValue(*it1, entries);
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162 list.push_back(ext);
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163 }
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164 #endif
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165 return list;
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166 }