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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 Sonic Visualiser
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5 An audio file viewer and annotation editor.
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2008 QMUL.
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8
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9 This program is free software; you can redistribute it and/or
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10 modify it under the terms of the GNU General Public License as
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11 published by the Free Software Foundation; either version 2 of the
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12 License, or (at your option) any later version. See the file
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13 COPYING included with this distribution for more information.
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14 */
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15
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16 #include "SimpleSPARQLQuery.h"
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17 #include "base/ProgressReporter.h"
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18 #include "base/Profiler.h"
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19
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20 #include <QMutex>
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21 #include <QMutexLocker>
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22 #include <QRegExp>
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23
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24 #include <set>
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25
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26 #include <redland.h>
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27
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28 //#define DEBUG_SIMPLE_SPARQL_QUERY 1
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29
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30 #include <iostream>
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31
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32 using std::cerr;
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33 using std::endl;
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34
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35 class WredlandWorldWrapper
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36 {
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37 public:
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38 WredlandWorldWrapper();
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39 ~WredlandWorldWrapper();
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40
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41 bool isOK() const;
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42
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43 bool loadUriIntoDefaultModel(QString uriString, QString &errorString);
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44
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45 librdf_world *getWorld() { return m_world; }
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46 const librdf_world *getWorld() const { return m_world; }
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47
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48 librdf_model *getDefaultModel() { return m_defaultModel; }
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49 const librdf_model *getDefaultModel() const { return m_defaultModel; }
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50
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51 librdf_model *getModel(QString fromUri);
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52 void freeModel(QString forUri);
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53
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54 private:
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55 QMutex m_mutex;
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56
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57 librdf_world *m_world;
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58 librdf_storage *m_defaultStorage;
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59 librdf_model *m_defaultModel;
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60
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61 std::set<QString> m_defaultModelUris;
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62
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63 std::map<QString, librdf_storage *> m_ownStorageUris;
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64 std::map<QString, librdf_model *> m_ownModelUris;
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65
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66 bool loadUri(librdf_model *model, QString uri, QString &errorString);
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67 };
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68
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69 WredlandWorldWrapper::WredlandWorldWrapper() :
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70 m_world(0), m_defaultStorage(0), m_defaultModel(0)
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71 {
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72 m_world = librdf_new_world();
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73 if (!m_world) {
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74 cerr << "SimpleSPARQLQuery: ERROR: Failed to create LIBRDF world!" << endl;
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75 return;
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76 }
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77 librdf_world_open(m_world);
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78
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79 m_defaultStorage = librdf_new_storage(m_world, "trees", NULL, NULL);
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80 if (!m_defaultStorage) {
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81 std::cerr << "SimpleSPARQLQuery: WARNING: Failed to initialise Redland trees datastore, falling back to memory store" << std::endl;
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82 m_defaultStorage = librdf_new_storage(m_world, NULL, NULL, NULL);
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83 if (!m_defaultStorage) {
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84 std::cerr << "SimpleSPARQLQuery: ERROR: Failed to initialise Redland memory datastore" << std::endl;
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85 return;
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86 }
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87 }
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88 m_defaultModel = librdf_new_model(m_world, m_defaultStorage, NULL);
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89 if (!m_defaultModel) {
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90 std::cerr << "SimpleSPARQLQuery: ERROR: Failed to initialise Redland data model" << std::endl;
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91 return;
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92 }
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93 }
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94
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95 WredlandWorldWrapper::~WredlandWorldWrapper()
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96 {
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97 while (!m_ownModelUris.empty()) {
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98 librdf_free_model(m_ownModelUris.begin()->second);
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99 m_ownModelUris.erase(m_ownModelUris.begin());
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100 }
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101 while (!m_ownStorageUris.empty()) {
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102 librdf_free_storage(m_ownStorageUris.begin()->second);
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103 m_ownStorageUris.erase(m_ownStorageUris.begin());
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104 }
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105 if (m_defaultModel) librdf_free_model(m_defaultModel);
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106 if (m_defaultStorage) librdf_free_storage(m_defaultStorage);
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107 if (m_world) librdf_free_world(m_world);
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108 }
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109
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110 bool
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111 WredlandWorldWrapper::isOK() const {
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112 return (m_defaultModel != 0);
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113 }
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114
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115 bool
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116 WredlandWorldWrapper::loadUriIntoDefaultModel(QString uriString, QString &errorString)
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117 {
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118 QMutexLocker locker(&m_mutex);
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119
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120 if (m_defaultModelUris.find(uriString) != m_defaultModelUris.end()) {
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121 return true;
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122 }
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123
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124 if (loadUri(m_defaultModel, uriString, errorString)) {
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125 m_defaultModelUris.insert(uriString);
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126 return true;
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127 } else {
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128 return false;
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129 }
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130 }
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131
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132 librdf_model *
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133 WredlandWorldWrapper::getModel(QString fromUri)
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134 {
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135 QMutexLocker locker(&m_mutex);
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136 if (fromUri == "") {
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137 return getDefaultModel();
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138 }
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139 if (m_ownModelUris.find(fromUri) != m_ownModelUris.end()) {
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140 return m_ownModelUris[fromUri];
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141 }
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142 librdf_storage *storage = librdf_new_storage(m_world, "trees", NULL, NULL);
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143 if (!storage) { // don't warn here, we probably already did it in main ctor
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144 storage = librdf_new_storage(m_world, NULL, NULL, NULL);
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145 }
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146 librdf_model *model = librdf_new_model(m_world, storage, NULL);
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147 if (!model) {
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148 std::cerr << "SimpleSPARQLQuery: ERROR: Failed to create new model" << std::endl;
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149 librdf_free_storage(storage);
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150 return 0;
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151 }
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152 QString err;
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153 if (!loadUri(model, fromUri, err)) {
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154 std::cerr << "SimpleSPARQLQuery: ERROR: Failed to parse into new model: " << err.toStdString() << std::endl;
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155 librdf_free_model(model);
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156 librdf_free_storage(storage);
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157 m_ownModelUris[fromUri] = 0;
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158 return 0;
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159 }
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160 m_ownModelUris[fromUri] = model;
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161 m_ownStorageUris[fromUri] = storage;
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162 return model;
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163 }
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164
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165 void
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166 WredlandWorldWrapper::freeModel(QString forUri)
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167 {
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168 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
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169 std::cerr << "SimpleSPARQLQuery::freeModel: Model uri = \"" << forUri.toStdString() << "\"" << std::endl;
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170 #endif
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171
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172 QMutexLocker locker(&m_mutex);
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173 if (forUri == "") {
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174 std::cerr << "SimpleSPARQLQuery::freeModel: ERROR: Can't free default model" << std::endl;
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175 return;
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176 }
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177 if (m_ownModelUris.find(forUri) == m_ownModelUris.end()) {
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178 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
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179 std::cerr << "SimpleSPARQLQuery::freeModel: NOTE: Unknown or already-freed model (uri = \"" << forUri.toStdString() << "\")" << std::endl;
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180 #endif
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181 return;
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182 }
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183
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184 librdf_model *model = m_ownModelUris[forUri];
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185 if (model) librdf_free_model(model);
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186 m_ownModelUris.erase(forUri);
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187
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188 if (m_ownStorageUris.find(forUri) != m_ownStorageUris.end()) {
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189 librdf_storage *storage = m_ownStorageUris[forUri];
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190 if (storage) librdf_free_storage(storage);
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191 m_ownStorageUris.erase(forUri);
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192 }
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193 }
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194
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195 bool
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196 WredlandWorldWrapper::loadUri(librdf_model *model, QString uri, QString &errorString)
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197 {
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198 librdf_uri *luri = librdf_new_uri
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199 (m_world, (const unsigned char *)uri.toUtf8().data());
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200 if (!luri) {
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201 errorString = "Failed to construct librdf_uri!";
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202 return false;
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203 }
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204
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205 librdf_parser *parser = librdf_new_parser(m_world, "guess", NULL, NULL);
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206 if (!parser) {
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207 errorString = "Failed to initialise Redland parser";
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208 return false;
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209 }
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210
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211 std::cerr << "About to parse \"" << uri.toStdString() << "\"" << std::endl;
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212
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213 Profiler p("SimpleSPARQLQuery: Parse URI into LIBRDF model");
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214
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215 if (librdf_parser_parse_into_model(parser, luri, NULL, model)) {
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216
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217 errorString = QString("Failed to parse RDF from URI \"%1\"")
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218 .arg(uri);
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219 librdf_free_parser(parser);
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220 return false;
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221
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222 } else {
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223
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224 librdf_free_parser(parser);
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225 return true;
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226 }
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227 }
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228
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229
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230 class SimpleSPARQLQuery::Impl
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231 {
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232 public:
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233 Impl(SimpleSPARQLQuery::QueryType, QString query);
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234 ~Impl();
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235
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236 static bool addSourceToModel(QString sourceUri);
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237 static void closeSingleSource(QString sourceUri);
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238
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239 void setProgressReporter(ProgressReporter *reporter) { m_reporter = reporter; }
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240 bool wasCancelled() const { return m_cancelled; }
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241
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242 ResultList execute();
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243
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244 bool isOK() const;
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245 QString getErrorString() const;
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246
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247 protected:
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248 static QMutex m_mutex;
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249
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250 static WredlandWorldWrapper m_redland;
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251
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252 ResultList executeDirectParser();
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253 ResultList executeDatastore();
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254 ResultList executeFor(QString modelUri);
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255
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256 QueryType m_type;
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257 QString m_query;
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258 QString m_errorString;
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259 ProgressReporter *m_reporter;
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260 bool m_cancelled;
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261 };
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262
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263 WredlandWorldWrapper SimpleSPARQLQuery::Impl::m_redland;
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264
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265 QMutex SimpleSPARQLQuery::Impl::m_mutex;
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266
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267 SimpleSPARQLQuery::SimpleSPARQLQuery(QueryType type, QString query) :
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268 m_impl(new Impl(type, query))
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269 {
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270 }
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271
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272 SimpleSPARQLQuery::~SimpleSPARQLQuery()
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273 {
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274 delete m_impl;
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275 }
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276
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277 void
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278 SimpleSPARQLQuery::setProgressReporter(ProgressReporter *reporter)
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279 {
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280 m_impl->setProgressReporter(reporter);
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281 }
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282
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283 bool
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284 SimpleSPARQLQuery::wasCancelled() const
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285 {
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286 return m_impl->wasCancelled();
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287 }
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288
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289 SimpleSPARQLQuery::ResultList
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290 SimpleSPARQLQuery::execute()
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291 {
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292 return m_impl->execute();
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293 }
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294
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295 bool
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296 SimpleSPARQLQuery::isOK() const
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297 {
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298 return m_impl->isOK();
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299 }
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300
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301 QString
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302 SimpleSPARQLQuery::getErrorString() const
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303 {
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304 return m_impl->getErrorString();
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305 }
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306
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307 bool
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308 SimpleSPARQLQuery::addSourceToModel(QString sourceUri)
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309 {
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310 return SimpleSPARQLQuery::Impl::addSourceToModel(sourceUri);
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311 }
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312
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313 void
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314 SimpleSPARQLQuery::closeSingleSource(QString sourceUri)
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315 {
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316 SimpleSPARQLQuery::Impl::closeSingleSource(sourceUri);
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317 }
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318
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319 SimpleSPARQLQuery::Impl::Impl(QueryType type, QString query) :
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320 m_type(type),
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321 m_query(query),
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322 m_reporter(0),
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323 m_cancelled(false)
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324 {
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325 }
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326
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327 SimpleSPARQLQuery::Impl::~Impl()
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328 {
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329 }
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330
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331 bool
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332 SimpleSPARQLQuery::Impl::isOK() const
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333 {
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334 return (m_errorString == "");
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335 }
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336
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337 QString
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338 SimpleSPARQLQuery::Impl::getErrorString() const
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339 {
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340 return m_errorString;
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341 }
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342
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343 SimpleSPARQLQuery::ResultList
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344 SimpleSPARQLQuery::Impl::execute()
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345 {
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346 ResultList list;
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347
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348 QMutexLocker locker(&m_mutex);
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349
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350 if (!m_redland.isOK()) {
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351 cerr << "ERROR: SimpleSPARQLQuery::execute: Failed to initialise Redland datastore" << endl;
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352 return list;
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353 }
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354
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355 if (m_type == QueryFromSingleSource) {
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356 return executeDirectParser();
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357 } else {
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358 return executeDatastore();
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359 }
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360
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361 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
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362 if (m_errorString != "") {
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363 std::cerr << "SimpleSPARQLQuery::execute: error returned: \""
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364 << m_errorString.toStdString() << "\"" << std::endl;
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365 }
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366 #endif
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367 }
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368
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369 SimpleSPARQLQuery::ResultList
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370 SimpleSPARQLQuery::Impl::executeDirectParser()
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371 {
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372 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
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373 std::cerr << "SimpleSPARQLQuery::executeDirectParser: Query is: \"" << m_query.toStdString() << "\"" << std::endl;
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374 #endif
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375
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376 ResultList list;
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377
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378 Profiler profiler("SimpleSPARQLQuery::executeDirectParser");
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379
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380 static QRegExp fromRE("from\\s+<([^>]+)>", Qt::CaseInsensitive);
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381 QString fromUri;
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382
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383 if (fromRE.indexIn(m_query) < 0) {
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Chris@492
|
384 std::cerr << "SimpleSPARQLQuery::executeDirectParser: Query contains no FROM clause, nothing to parse from" << std::endl;
|
Chris@492
|
385 return list;
|
Chris@492
|
386 } else {
|
Chris@492
|
387 fromUri = fromRE.cap(1);
|
Chris@492
|
388 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
|
Chris@492
|
389 std::cerr << "SimpleSPARQLQuery::executeDirectParser: FROM URI is <"
|
Chris@492
|
390 << fromUri.toStdString() << ">" << std::endl;
|
Chris@440
|
391 #endif
|
Chris@439
|
392 }
|
Chris@439
|
393
|
Chris@492
|
394 return executeFor(fromUri);
|
Chris@439
|
395 }
|
Chris@440
|
396
|
Chris@480
|
397 SimpleSPARQLQuery::ResultList
|
Chris@480
|
398 SimpleSPARQLQuery::Impl::executeDatastore()
|
Chris@480
|
399 {
|
Chris@492
|
400 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
|
Chris@492
|
401 std::cerr << "SimpleSPARQLQuery::executeDatastore: Query is: \"" << m_query.toStdString() << "\"" << std::endl;
|
Chris@492
|
402 #endif
|
Chris@492
|
403
|
Chris@480
|
404 ResultList list;
|
Chris@489
|
405
|
Chris@480
|
406 Profiler profiler("SimpleSPARQLQuery::executeDatastore");
|
Chris@480
|
407
|
Chris@492
|
408 return executeFor("");
|
Chris@492
|
409 }
|
Chris@492
|
410
|
Chris@492
|
411 SimpleSPARQLQuery::ResultList
|
Chris@492
|
412 SimpleSPARQLQuery::Impl::executeFor(QString modelUri)
|
Chris@492
|
413 {
|
Chris@492
|
414 ResultList list;
|
Chris@492
|
415 librdf_query *query;
|
Chris@492
|
416
|
Chris@493
|
417 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
|
Chris@480
|
418 static std::map<QString, int> counter;
|
Chris@480
|
419 if (counter.find(m_query) == counter.end()) counter[m_query] = 1;
|
Chris@480
|
420 else ++counter[m_query];
|
Chris@480
|
421 std::cerr << "Counter for this query: " << counter[m_query] << std::endl;
|
Chris@492
|
422 std::cerr << "Base URI is: \"" << modelUri.toStdString() << "\"" << std::endl;
|
Chris@493
|
423 #endif
|
Chris@480
|
424
|
Chris@480
|
425 {
|
Chris@480
|
426 Profiler p("SimpleSPARQLQuery: Prepare LIBRDF query");
|
Chris@480
|
427 query = librdf_new_query
|
Chris@492
|
428 (m_redland.getWorld(), "sparql", NULL,
|
Chris@489
|
429 (const unsigned char *)m_query.toUtf8().data(), NULL);
|
Chris@480
|
430 }
|
Chris@480
|
431
|
Chris@480
|
432 if (!query) {
|
Chris@480
|
433 m_errorString = "Failed to construct query";
|
Chris@480
|
434 return list;
|
Chris@480
|
435 }
|
Chris@480
|
436
|
Chris@480
|
437 librdf_query_results *results;
|
Chris@480
|
438 {
|
Chris@480
|
439 Profiler p("SimpleSPARQLQuery: Execute LIBRDF query");
|
Chris@492
|
440 results = librdf_query_execute(query, m_redland.getModel(modelUri));
|
Chris@480
|
441 }
|
Chris@480
|
442
|
Chris@480
|
443 if (!results) {
|
Chris@480
|
444 cerr << "SimpleSPARQLQuery: LIBRDF query failed" << endl;
|
Chris@480
|
445 librdf_free_query(query);
|
Chris@480
|
446 return list;
|
Chris@480
|
447 }
|
Chris@480
|
448
|
Chris@480
|
449 if (!librdf_query_results_is_bindings(results)) {
|
Chris@480
|
450 cerr << "SimpleSPARQLQuery: LIBRDF query has wrong result type (not bindings)" << endl;
|
Chris@480
|
451 librdf_free_query_results(results);
|
Chris@480
|
452 librdf_free_query(query);
|
Chris@480
|
453 return list;
|
Chris@480
|
454 }
|
Chris@480
|
455
|
Chris@480
|
456 int resultCount = 0;
|
Chris@480
|
457 int resultTotal = librdf_query_results_get_count(results); // probably wrong
|
Chris@480
|
458 m_cancelled = false;
|
Chris@480
|
459
|
Chris@480
|
460 while (!librdf_query_results_finished(results)) {
|
Chris@480
|
461
|
Chris@480
|
462 int count = librdf_query_results_get_bindings_count(results);
|
Chris@480
|
463
|
Chris@480
|
464 KeyValueMap resultmap;
|
Chris@480
|
465
|
Chris@480
|
466 for (int i = 0; i < count; ++i) {
|
Chris@480
|
467
|
Chris@480
|
468 const char *name =
|
Chris@480
|
469 librdf_query_results_get_binding_name(results, i);
|
Chris@480
|
470
|
Chris@490
|
471 if (!name) {
|
Chris@490
|
472 std::cerr << "WARNING: Result " << i << " of query has no name" << std::endl;
|
Chris@490
|
473 continue;
|
Chris@490
|
474 }
|
Chris@490
|
475
|
Chris@480
|
476 librdf_node *node =
|
Chris@480
|
477 librdf_query_results_get_binding_value(results, i);
|
Chris@480
|
478
|
Chris@480
|
479 QString key = (const char *)name;
|
Chris@480
|
480
|
Chris@480
|
481 if (!node) {
|
Chris@492
|
482 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
|
Chris@492
|
483 std::cerr << i << ". " << key.toStdString() << " -> (nil)" << std::endl;
|
Chris@492
|
484 #endif
|
Chris@480
|
485 resultmap[key] = Value();
|
Chris@480
|
486 continue;
|
Chris@480
|
487 }
|
Chris@480
|
488
|
Chris@480
|
489 ValueType type = LiteralValue;
|
Chris@481
|
490 QString text;
|
Chris@481
|
491
|
Chris@481
|
492 if (librdf_node_is_resource(node)) {
|
Chris@481
|
493
|
Chris@481
|
494 type = URIValue;
|
Chris@481
|
495 librdf_uri *uri = librdf_node_get_uri(node);
|
Chris@490
|
496 const char *us = (const char *)librdf_uri_as_string(uri);
|
Chris@490
|
497
|
Chris@490
|
498 if (!us) {
|
Chris@490
|
499 std::cerr << "WARNING: Result " << i << " of query claims URI type, but has null URI" << std::endl;
|
Chris@490
|
500 } else {
|
Chris@490
|
501 text = us;
|
Chris@490
|
502 }
|
Chris@481
|
503
|
Chris@481
|
504 } else if (librdf_node_is_literal(node)) {
|
Chris@481
|
505
|
Chris@481
|
506 type = LiteralValue;
|
Chris@490
|
507
|
Chris@490
|
508 const char *lit = (const char *)librdf_node_get_literal_value(node);
|
Chris@490
|
509 if (!lit) {
|
Chris@490
|
510 std::cerr << "WARNING: Result " << i << " of query claims literal type, but has no literal" << std::endl;
|
Chris@490
|
511 } else {
|
Chris@490
|
512 text = lit;
|
Chris@490
|
513 }
|
Chris@481
|
514
|
Chris@481
|
515 } else if (librdf_node_is_blank(node)) {
|
Chris@481
|
516
|
Chris@481
|
517 type = BlankValue;
|
Chris@481
|
518
|
Chris@494
|
519 const char *lit = (const char *)librdf_node_get_literal_value(node);
|
Chris@494
|
520 if (lit) text = lit;
|
Chris@494
|
521
|
Chris@481
|
522 } else {
|
Chris@481
|
523
|
Chris@480
|
524 cerr << "SimpleSPARQLQuery: LIBRDF query returned unknown node type (not resource, literal, or blank)" << endl;
|
Chris@480
|
525 }
|
Chris@480
|
526
|
Chris@480
|
527 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
|
Chris@481
|
528 cerr << i << ". " << key.toStdString() << " -> " << text.toStdString() << " (type " << type << ")" << endl;
|
Chris@480
|
529 #endif
|
Chris@480
|
530
|
Chris@480
|
531 resultmap[key] = Value(type, text);
|
Chris@480
|
532
|
Chris@492
|
533 // librdf_free_node(node);
|
Chris@480
|
534 }
|
Chris@480
|
535
|
Chris@480
|
536 list.push_back(resultmap);
|
Chris@480
|
537
|
Chris@480
|
538 librdf_query_results_next(results);
|
Chris@480
|
539
|
Chris@480
|
540 resultCount++;
|
Chris@480
|
541
|
Chris@480
|
542 if (m_reporter) {
|
Chris@480
|
543 if (resultCount >= resultTotal) {
|
Chris@480
|
544 if (m_reporter->isDefinite()) m_reporter->setDefinite(false);
|
Chris@480
|
545 m_reporter->setProgress(resultCount);
|
Chris@480
|
546 } else {
|
Chris@480
|
547 m_reporter->setProgress((resultCount * 100) / resultTotal);
|
Chris@480
|
548 }
|
Chris@480
|
549
|
Chris@480
|
550 if (m_reporter->wasCancelled()) {
|
Chris@480
|
551 m_cancelled = true;
|
Chris@480
|
552 break;
|
Chris@480
|
553 }
|
Chris@480
|
554 }
|
Chris@480
|
555 }
|
Chris@480
|
556
|
Chris@480
|
557 librdf_free_query_results(results);
|
Chris@480
|
558 librdf_free_query(query);
|
Chris@480
|
559
|
Chris@481
|
560 #ifdef DEBUG_SIMPLE_SPARQL_QUERY
|
Chris@492
|
561 cerr << "SimpleSPARQLQuery::executeDatastore: All results retrieved (" << resultCount << " of them)" << endl;
|
Chris@481
|
562 #endif
|
Chris@480
|
563
|
Chris@480
|
564 return list;
|
Chris@489
|
565 }
|
Chris@489
|
566
|
Chris@489
|
567 bool
|
Chris@489
|
568 SimpleSPARQLQuery::Impl::addSourceToModel(QString sourceUri)
|
Chris@489
|
569 {
|
Chris@489
|
570 QString err;
|
Chris@489
|
571
|
Chris@490
|
572 QMutexLocker locker(&m_mutex);
|
Chris@489
|
573
|
Chris@492
|
574 if (!m_redland.isOK()) {
|
Chris@492
|
575 std::cerr << "SimpleSPARQLQuery::addSourceToModel: Failed to initialise Redland datastore" << std::endl;
|
Chris@492
|
576 return false;
|
Chris@489
|
577 }
|
Chris@489
|
578
|
Chris@492
|
579 if (!m_redland.loadUriIntoDefaultModel(sourceUri, err)) {
|
Chris@489
|
580 std::cerr << "SimpleSPARQLQuery::addSourceToModel: Failed to add source URI \"" << sourceUri.toStdString() << ": " << err.toStdString() << std::endl;
|
Chris@489
|
581 return false;
|
Chris@489
|
582 }
|
Chris@489
|
583 return true;
|
Chris@480
|
584 }
|
Chris@480
|
585
|
Chris@492
|
586 void
|
Chris@492
|
587 SimpleSPARQLQuery::Impl::closeSingleSource(QString sourceUri)
|
Chris@492
|
588 {
|
Chris@492
|
589 QMutexLocker locker(&m_mutex);
|
Chris@492
|
590
|
Chris@492
|
591 m_redland.freeModel(sourceUri);
|
Chris@492
|
592 }
|
Chris@492
|
593
|
Chris@440
|
594 SimpleSPARQLQuery::Value
|
Chris@489
|
595 SimpleSPARQLQuery::singleResultQuery(QueryType type,
|
Chris@480
|
596 QString query, QString binding)
|
Chris@440
|
597 {
|
Chris@489
|
598 SimpleSPARQLQuery q(type, query);
|
Chris@440
|
599 ResultList results = q.execute();
|
Chris@440
|
600 if (!q.isOK()) {
|
Chris@440
|
601 cerr << "SimpleSPARQLQuery::singleResultQuery: ERROR: "
|
Chris@440
|
602 << q.getErrorString().toStdString() << endl;
|
Chris@440
|
603 return Value();
|
Chris@440
|
604 }
|
Chris@440
|
605 if (results.empty()) {
|
Chris@440
|
606 return Value();
|
Chris@440
|
607 }
|
Chris@440
|
608 for (int i = 0; i < results.size(); ++i) {
|
Chris@440
|
609 if (results[i].find(binding) != results[i].end() &&
|
Chris@440
|
610 results[i][binding].type != NoValue) {
|
Chris@440
|
611 return results[i][binding];
|
Chris@440
|
612 }
|
Chris@440
|
613 }
|
Chris@440
|
614 return Value();
|
Chris@440
|
615 }
|
Chris@440
|
616
|
Chris@440
|
617
|
Chris@440
|
618
|