Chris@439: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@439: 
Chris@439: /*
Chris@439:     Sonic Visualiser
Chris@439:     An audio file viewer and annotation editor.
Chris@439:     Centre for Digital Music, Queen Mary, University of London.
Chris@439:     This file copyright 2008 QMUL.
Chris@439:    
Chris@439:     This program is free software; you can redistribute it and/or
Chris@439:     modify it under the terms of the GNU General Public License as
Chris@439:     published by the Free Software Foundation; either version 2 of the
Chris@439:     License, or (at your option) any later version.  See the file
Chris@439:     COPYING included with this distribution for more information.
Chris@439: */
Chris@439: 
Chris@439: #include "SimpleSPARQLQuery.h"
Chris@439: #include "base/ProgressReporter.h"
Chris@480: #include "base/Profiler.h"
Chris@480: 
Chris@480: #include <QMutex>
Chris@480: #include <QMutexLocker>
Chris@481: #include <QRegExp>
Chris@480: 
Chris@480: #include <set>
Chris@439: 
Chris@480: #include <redland.h>
Chris@480: 
Chris@492: //#define DEBUG_SIMPLE_SPARQL_QUERY 1
Chris@461: 
Chris@439: #include <iostream>
Chris@439: 
Chris@439: using std::cerr;
Chris@439: using std::endl;
Chris@439: 
Chris@480: class WredlandWorldWrapper
Chris@480: {
Chris@480: public:
Chris@492:     WredlandWorldWrapper();
Chris@492:     ~WredlandWorldWrapper();
Chris@480: 
Chris@492:     bool isOK() const;
Chris@480: 
Chris@492:     bool loadUriIntoDefaultModel(QString uriString, QString &errorString);
Chris@480:         
Chris@480:     librdf_world *getWorld() { return m_world; }
Chris@480:     const librdf_world *getWorld() const { return m_world; }
Chris@480:         
Chris@492:     librdf_model *getDefaultModel() { return m_defaultModel; }
Chris@492:     const librdf_model *getDefaultModel() const { return m_defaultModel; }
Chris@492: 
Chris@492:     librdf_model *getModel(QString fromUri);
Chris@492:     void freeModel(QString forUri);
Chris@480: 
Chris@480: private:
Chris@492:     QMutex m_mutex;
Chris@492: 
Chris@480:     librdf_world *m_world;
Chris@492:     librdf_storage *m_defaultStorage;
Chris@492:     librdf_model *m_defaultModel;
Chris@480: 
Chris@492:     std::set<QString> m_defaultModelUris;
Chris@492: 
Chris@492:     std::map<QString, librdf_storage *> m_ownStorageUris;
Chris@492:     std::map<QString, librdf_model *> m_ownModelUris;
Chris@492: 
Chris@492:     bool loadUri(librdf_model *model, QString uri, QString &errorString);
Chris@480: };
Chris@480: 
Chris@492: WredlandWorldWrapper::WredlandWorldWrapper() :
Chris@492:     m_world(0), m_defaultStorage(0), m_defaultModel(0)
Chris@492: {
Chris@492:     m_world = librdf_new_world();
Chris@492:     if (!m_world) {
Chris@492:         cerr << "SimpleSPARQLQuery: ERROR: Failed to create LIBRDF world!" << endl;
Chris@492:         return;
Chris@492:     }
Chris@492:     librdf_world_open(m_world);
Chris@492: 
Chris@492:     m_defaultStorage = librdf_new_storage(m_world, "trees", NULL, NULL);
Chris@492:     if (!m_defaultStorage) {
Chris@495:         std::cerr << "SimpleSPARQLQuery: WARNING: Failed to initialise Redland trees datastore, falling back to memory store" << std::endl;
Chris@492:         m_defaultStorage = librdf_new_storage(m_world, NULL, NULL, NULL);
Chris@492:         if (!m_defaultStorage) {
Chris@492:             std::cerr << "SimpleSPARQLQuery: ERROR: Failed to initialise Redland memory datastore" << std::endl;
Chris@492:             return;
Chris@492:         }                
Chris@492:     }
Chris@492:     m_defaultModel = librdf_new_model(m_world, m_defaultStorage, NULL);
Chris@492:     if (!m_defaultModel) {
Chris@492:         std::cerr << "SimpleSPARQLQuery: ERROR: Failed to initialise Redland data model" << std::endl;
Chris@492:         return;
Chris@492:     }
Chris@492: }
Chris@492: 
Chris@492: WredlandWorldWrapper::~WredlandWorldWrapper()
Chris@492: {
Chris@492:     while (!m_ownModelUris.empty()) {
Chris@492:         librdf_free_model(m_ownModelUris.begin()->second);
Chris@492:         m_ownModelUris.erase(m_ownModelUris.begin());
Chris@492:     }
Chris@492:     while (!m_ownStorageUris.empty()) {
Chris@492:         librdf_free_storage(m_ownStorageUris.begin()->second);
Chris@492:         m_ownStorageUris.erase(m_ownStorageUris.begin());
Chris@492:     }
Chris@492:     if (m_defaultModel) librdf_free_model(m_defaultModel);
Chris@492:     if (m_defaultStorage) librdf_free_storage(m_defaultStorage);
Chris@492:     if (m_world) librdf_free_world(m_world);
Chris@492: }
Chris@492: 
Chris@492: bool
Chris@492: WredlandWorldWrapper::isOK() const {
Chris@492:     return (m_defaultModel != 0); 
Chris@492: }
Chris@492: 
Chris@492: bool
Chris@492: WredlandWorldWrapper::loadUriIntoDefaultModel(QString uriString, QString &errorString)
Chris@492: {
Chris@492:     QMutexLocker locker(&m_mutex);
Chris@492:     
Chris@492:     if (m_defaultModelUris.find(uriString) != m_defaultModelUris.end()) {
Chris@492:         return true;
Chris@492:     }
Chris@492:     
Chris@492:     if (loadUri(m_defaultModel, uriString, errorString)) {
Chris@492:         m_defaultModelUris.insert(uriString);
Chris@492:         return true;
Chris@492:     } else {
Chris@492:         return false;
Chris@492:     }
Chris@492: }
Chris@492: 
Chris@492: librdf_model *
Chris@492: WredlandWorldWrapper::getModel(QString fromUri)
Chris@492: {
Chris@492:     QMutexLocker locker(&m_mutex);
Chris@492:     if (fromUri == "") {
Chris@492:         return getDefaultModel();
Chris@492:     }
Chris@492:     if (m_ownModelUris.find(fromUri) != m_ownModelUris.end()) {
Chris@492:         return m_ownModelUris[fromUri];
Chris@492:     }
Chris@492:     librdf_storage *storage = librdf_new_storage(m_world, "trees", NULL, NULL);
Chris@492:     if (!storage) { // don't warn here, we probably already did it in main ctor
Chris@492:         storage = librdf_new_storage(m_world, NULL, NULL, NULL);
Chris@492:     }
Chris@492:     librdf_model *model = librdf_new_model(m_world, storage, NULL);
Chris@492:     if (!model) {
Chris@492:         std::cerr << "SimpleSPARQLQuery: ERROR: Failed to create new model" << std::endl;
Chris@492:         librdf_free_storage(storage);
Chris@492:         return 0;
Chris@492:     }
Chris@492:     QString err;
Chris@492:     if (!loadUri(model, fromUri, err)) {
Chris@492:         std::cerr << "SimpleSPARQLQuery: ERROR: Failed to parse into new model: " << err.toStdString() << std::endl;
Chris@492:         librdf_free_model(model);
Chris@492:         librdf_free_storage(storage);
Chris@492:         m_ownModelUris[fromUri] = 0;
Chris@492:         return 0;
Chris@492:     }
Chris@492:     m_ownModelUris[fromUri] = model;
Chris@492:     m_ownStorageUris[fromUri] = storage;
Chris@492:     return model;
Chris@492: }
Chris@492: 
Chris@492: void
Chris@492: WredlandWorldWrapper::freeModel(QString forUri)
Chris@492: {
Chris@493: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@493:     std::cerr << "SimpleSPARQLQuery::freeModel: Model uri = \"" << forUri.toStdString() << "\"" << std::endl;
Chris@493: #endif
Chris@493: 
Chris@492:     QMutexLocker locker(&m_mutex);
Chris@492:     if (forUri == "") {
Chris@492:         std::cerr << "SimpleSPARQLQuery::freeModel: ERROR: Can't free default model" << std::endl;
Chris@492:         return;
Chris@492:     }
Chris@492:     if (m_ownModelUris.find(forUri) == m_ownModelUris.end()) {
Chris@493: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@493:         std::cerr << "SimpleSPARQLQuery::freeModel: NOTE: Unknown or already-freed model (uri = \"" << forUri.toStdString() << "\")" << std::endl;
Chris@493: #endif
Chris@492:         return;
Chris@492:     }
Chris@492: 
Chris@492:     librdf_model *model = m_ownModelUris[forUri];
Chris@492:     if (model) librdf_free_model(model);
Chris@492:     m_ownModelUris.erase(forUri);
Chris@492: 
Chris@492:     if (m_ownStorageUris.find(forUri) != m_ownStorageUris.end()) {
Chris@492:         librdf_storage *storage = m_ownStorageUris[forUri];
Chris@492:         if (storage) librdf_free_storage(storage);
Chris@492:         m_ownStorageUris.erase(forUri);
Chris@492:     }        
Chris@492: }
Chris@492: 
Chris@492: bool
Chris@492: WredlandWorldWrapper::loadUri(librdf_model *model, QString uri, QString &errorString)
Chris@492: {
Chris@492:     librdf_uri *luri = librdf_new_uri
Chris@492:         (m_world, (const unsigned char *)uri.toUtf8().data());
Chris@492:     if (!luri) {
Chris@492:         errorString = "Failed to construct librdf_uri!";
Chris@492:         return false;
Chris@492:     }
Chris@492:     
Chris@492:     librdf_parser *parser = librdf_new_parser(m_world, "guess", NULL, NULL);
Chris@492:     if (!parser) {
Chris@492:         errorString = "Failed to initialise Redland parser";
Chris@492:         return false;
Chris@492:     }
Chris@492:     
Chris@492:     std::cerr << "About to parse \"" << uri.toStdString() << "\"" << std::endl;
Chris@492:     
Chris@492:     Profiler p("SimpleSPARQLQuery: Parse URI into LIBRDF model");
Chris@492:     
Chris@492:     if (librdf_parser_parse_into_model(parser, luri, NULL, model)) {
Chris@492:         
Chris@492:         errorString = QString("Failed to parse RDF from URI \"%1\"")
Chris@492:             .arg(uri);
Chris@492:         librdf_free_parser(parser);
Chris@492:         return false;
Chris@492:         
Chris@492:     } else {
Chris@492:         
Chris@492:         librdf_free_parser(parser);
Chris@492:         return true;
Chris@492:     }
Chris@492: }        
Chris@492: 
Chris@492: 
Chris@439: class SimpleSPARQLQuery::Impl
Chris@439: {
Chris@439: public:
Chris@489:     Impl(SimpleSPARQLQuery::QueryType, QString query);
Chris@439:     ~Impl();
Chris@439: 
Chris@489:     static bool addSourceToModel(QString sourceUri);
Chris@492:     static void closeSingleSource(QString sourceUri);
Chris@489: 
Chris@439:     void setProgressReporter(ProgressReporter *reporter) { m_reporter = reporter; }
Chris@439:     bool wasCancelled() const { return m_cancelled; }
Chris@439: 
Chris@439:     ResultList execute();
Chris@439: 
Chris@439:     bool isOK() const;
Chris@439:     QString getErrorString() const;
Chris@439: 
Chris@439: protected:
Chris@480:     static QMutex m_mutex;
Chris@480: 
Chris@492:     static WredlandWorldWrapper m_redland;
Chris@480: 
Chris@480:     ResultList executeDirectParser();
Chris@480:     ResultList executeDatastore();
Chris@492:     ResultList executeFor(QString modelUri);
Chris@480: 
Chris@489:     QueryType m_type;
Chris@439:     QString m_query;
Chris@439:     QString m_errorString;
Chris@439:     ProgressReporter *m_reporter;
Chris@439:     bool m_cancelled;
Chris@439: };
Chris@439: 
Chris@492: WredlandWorldWrapper SimpleSPARQLQuery::Impl::m_redland;
Chris@480: 
Chris@480: QMutex SimpleSPARQLQuery::Impl::m_mutex;
Chris@480: 
Chris@489: SimpleSPARQLQuery::SimpleSPARQLQuery(QueryType type, QString query) :
Chris@489:     m_impl(new Impl(type, query))
Chris@480: {
Chris@480: }
Chris@439: 
Chris@439: SimpleSPARQLQuery::~SimpleSPARQLQuery() 
Chris@439: {
Chris@439:     delete m_impl;
Chris@439: }
Chris@439: 
Chris@439: void
Chris@439: SimpleSPARQLQuery::setProgressReporter(ProgressReporter *reporter)
Chris@439: {
Chris@439:     m_impl->setProgressReporter(reporter);
Chris@439: }
Chris@439: 
Chris@439: bool
Chris@439: SimpleSPARQLQuery::wasCancelled() const
Chris@439: {
Chris@439:     return m_impl->wasCancelled();
Chris@439: }
Chris@439: 
Chris@439: SimpleSPARQLQuery::ResultList
Chris@439: SimpleSPARQLQuery::execute()
Chris@439: {
Chris@439:     return m_impl->execute();
Chris@439: }
Chris@439: 
Chris@439: bool
Chris@439: SimpleSPARQLQuery::isOK() const
Chris@439: {
Chris@439:     return m_impl->isOK();
Chris@439: }
Chris@439: 
Chris@439: QString
Chris@439: SimpleSPARQLQuery::getErrorString() const
Chris@439: {
Chris@439:     return m_impl->getErrorString();
Chris@439: }
Chris@439: 
Chris@489: bool
Chris@489: SimpleSPARQLQuery::addSourceToModel(QString sourceUri)
Chris@480: {
Chris@489:     return SimpleSPARQLQuery::Impl::addSourceToModel(sourceUri);
Chris@480: }
Chris@480: 
Chris@492: void
Chris@492: SimpleSPARQLQuery::closeSingleSource(QString sourceUri)
Chris@492: {
Chris@492:     SimpleSPARQLQuery::Impl::closeSingleSource(sourceUri);
Chris@492: }
Chris@492: 
Chris@489: SimpleSPARQLQuery::Impl::Impl(QueryType type, QString query) :
Chris@489:     m_type(type),
Chris@439:     m_query(query),
Chris@439:     m_reporter(0),
Chris@439:     m_cancelled(false)
Chris@439: {
Chris@439: }
Chris@439: 
Chris@439: SimpleSPARQLQuery::Impl::~Impl()
Chris@439: {
Chris@439: }
Chris@439: 
Chris@439: bool
Chris@439: SimpleSPARQLQuery::Impl::isOK() const
Chris@439: {
Chris@439:     return (m_errorString == "");
Chris@439: }
Chris@439: 
Chris@439: QString
Chris@439: SimpleSPARQLQuery::Impl::getErrorString() const
Chris@439: {
Chris@439:     return m_errorString;
Chris@439: }
Chris@439: 
Chris@439: SimpleSPARQLQuery::ResultList
Chris@439: SimpleSPARQLQuery::Impl::execute()
Chris@439: {
Chris@439:     ResultList list;
Chris@439: 
Chris@490:     QMutexLocker locker(&m_mutex);
Chris@480: 
Chris@492:     if (!m_redland.isOK()) {
Chris@492:         cerr << "ERROR: SimpleSPARQLQuery::execute: Failed to initialise Redland datastore" << endl;
Chris@492:         return list;
Chris@440:     }
Chris@480: 
Chris@489:     if (m_type == QueryFromSingleSource) {
Chris@480:         return executeDirectParser();
Chris@480:     } else {
Chris@480:         return executeDatastore();
Chris@480:     }
Chris@492: 
Chris@492: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@492:     if (m_errorString != "") {
Chris@492:         std::cerr << "SimpleSPARQLQuery::execute: error returned: \""
Chris@492:                   << m_errorString.toStdString() << "\"" << std::endl;
Chris@492:     }
Chris@492: #endif
Chris@480: }
Chris@480: 
Chris@480: SimpleSPARQLQuery::ResultList
Chris@480: SimpleSPARQLQuery::Impl::executeDirectParser()
Chris@480: {
Chris@492: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@492:     std::cerr << "SimpleSPARQLQuery::executeDirectParser: Query is: \"" << m_query.toStdString() << "\"" << std::endl;
Chris@492: #endif
Chris@492: 
Chris@480:     ResultList list;
Chris@480: 
Chris@480:     Profiler profiler("SimpleSPARQLQuery::executeDirectParser");
Chris@480: 
Chris@492:     static QRegExp fromRE("from\\s+<([^>]+)>", Qt::CaseInsensitive);
Chris@492:     QString fromUri;
Chris@492: 
Chris@492:     if (fromRE.indexIn(m_query) < 0) {
Chris@492:         std::cerr << "SimpleSPARQLQuery::executeDirectParser: Query contains no FROM clause, nothing to parse from" << std::endl;
Chris@492:         return list;
Chris@492:     } else {
Chris@492:         fromUri = fromRE.cap(1);
Chris@492: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@492:         std::cerr << "SimpleSPARQLQuery::executeDirectParser: FROM URI is <"
Chris@492:                   << fromUri.toStdString() << ">" << std::endl;
Chris@440: #endif
Chris@439:     }
Chris@439: 
Chris@492:     return executeFor(fromUri);
Chris@439: }
Chris@440: 
Chris@480: SimpleSPARQLQuery::ResultList
Chris@480: SimpleSPARQLQuery::Impl::executeDatastore()
Chris@480: {
Chris@492: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@492:     std::cerr << "SimpleSPARQLQuery::executeDatastore: Query is: \"" << m_query.toStdString() << "\"" << std::endl;
Chris@492: #endif
Chris@492: 
Chris@480:     ResultList list;
Chris@489: 
Chris@480:     Profiler profiler("SimpleSPARQLQuery::executeDatastore");
Chris@480: 
Chris@492:     return executeFor("");
Chris@492: }
Chris@492: 
Chris@492: SimpleSPARQLQuery::ResultList
Chris@492: SimpleSPARQLQuery::Impl::executeFor(QString modelUri)
Chris@492: {
Chris@492:     ResultList list;
Chris@492:     librdf_query *query;
Chris@492: 
Chris@493: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@480:     static std::map<QString, int> counter;
Chris@480:     if (counter.find(m_query) == counter.end()) counter[m_query] = 1;
Chris@480:     else ++counter[m_query];
Chris@480:     std::cerr << "Counter for this query: " << counter[m_query] << std::endl;
Chris@492:     std::cerr << "Base URI is: \"" << modelUri.toStdString() << "\"" << std::endl;
Chris@493: #endif
Chris@480: 
Chris@480:     {
Chris@480:         Profiler p("SimpleSPARQLQuery: Prepare LIBRDF query");
Chris@480:         query = librdf_new_query
Chris@492:             (m_redland.getWorld(), "sparql", NULL,
Chris@489:              (const unsigned char *)m_query.toUtf8().data(), NULL);
Chris@480:     }
Chris@480:     
Chris@480:     if (!query) {
Chris@480:         m_errorString = "Failed to construct query";
Chris@480:         return list;
Chris@480:     }
Chris@480: 
Chris@480:     librdf_query_results *results;
Chris@480:     {
Chris@480:         Profiler p("SimpleSPARQLQuery: Execute LIBRDF query");
Chris@492:         results = librdf_query_execute(query, m_redland.getModel(modelUri));
Chris@480:     }
Chris@480: 
Chris@480:     if (!results) {
Chris@480:         cerr << "SimpleSPARQLQuery: LIBRDF query failed" << endl;
Chris@480:         librdf_free_query(query);
Chris@480:         return list;
Chris@480:     }
Chris@480: 
Chris@480:     if (!librdf_query_results_is_bindings(results)) {
Chris@480:         cerr << "SimpleSPARQLQuery: LIBRDF query has wrong result type (not bindings)" << endl;
Chris@480:         librdf_free_query_results(results);
Chris@480:         librdf_free_query(query);
Chris@480:         return list;
Chris@480:     }
Chris@480:     
Chris@480:     int resultCount = 0;
Chris@480:     int resultTotal = librdf_query_results_get_count(results); // probably wrong
Chris@480:     m_cancelled = false;
Chris@480: 
Chris@480:     while (!librdf_query_results_finished(results)) {
Chris@480: 
Chris@480:         int count = librdf_query_results_get_bindings_count(results);
Chris@480: 
Chris@480:         KeyValueMap resultmap;
Chris@480: 
Chris@480:         for (int i = 0; i < count; ++i) {
Chris@480: 
Chris@480:             const char *name =
Chris@480:                 librdf_query_results_get_binding_name(results, i);
Chris@480: 
Chris@490:             if (!name) {
Chris@490:                 std::cerr << "WARNING: Result " << i << " of query has no name" << std::endl;
Chris@490:                 continue;
Chris@490:             }
Chris@490: 
Chris@480:             librdf_node *node =
Chris@480:                 librdf_query_results_get_binding_value(results, i);
Chris@480: 
Chris@480:             QString key = (const char *)name;
Chris@480: 
Chris@480:             if (!node) {
Chris@492: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@492:                 std::cerr << i << ". " << key.toStdString() << " -> (nil)" << std::endl;
Chris@492: #endif
Chris@480:                 resultmap[key] = Value();
Chris@480:                 continue;
Chris@480:             }
Chris@480: 
Chris@480:             ValueType type = LiteralValue;
Chris@481:             QString text;
Chris@481: 
Chris@481:             if (librdf_node_is_resource(node)) {
Chris@481: 
Chris@481:                 type = URIValue;
Chris@481:                 librdf_uri *uri = librdf_node_get_uri(node);
Chris@490:                 const char *us = (const char *)librdf_uri_as_string(uri);
Chris@490: 
Chris@490:                 if (!us) {
Chris@490:                     std::cerr << "WARNING: Result " << i << " of query claims URI type, but has null URI" << std::endl;
Chris@490:                 } else {
Chris@490:                     text = us;
Chris@490:                 }
Chris@481: 
Chris@481:             } else if (librdf_node_is_literal(node)) {
Chris@481: 
Chris@481:                 type = LiteralValue;
Chris@490: 
Chris@490:                 const char *lit = (const char *)librdf_node_get_literal_value(node);
Chris@490:                 if (!lit) {
Chris@490:                     std::cerr << "WARNING: Result " << i << " of query claims literal type, but has no literal" << std::endl;
Chris@490:                 } else {
Chris@490:                     text = lit;
Chris@490:                 }
Chris@481: 
Chris@481:             } else if (librdf_node_is_blank(node)) {
Chris@481: 
Chris@481:                 type = BlankValue;
Chris@481: 
Chris@494:                 const char *lit = (const char *)librdf_node_get_literal_value(node);
Chris@494:                 if (lit) text = lit;
Chris@494: 
Chris@481:             } else {
Chris@481: 
Chris@480:                 cerr << "SimpleSPARQLQuery: LIBRDF query returned unknown node type (not resource, literal, or blank)" << endl;
Chris@480:             }
Chris@480: 
Chris@480: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@481:             cerr << i << ". " << key.toStdString() << " -> " << text.toStdString() << " (type " << type << ")" << endl;
Chris@480: #endif
Chris@480: 
Chris@480:             resultmap[key] = Value(type, text);
Chris@480: 
Chris@492: //            librdf_free_node(node);
Chris@480:         }
Chris@480: 
Chris@480:         list.push_back(resultmap);
Chris@480: 
Chris@480:         librdf_query_results_next(results);
Chris@480: 
Chris@480:         resultCount++;
Chris@480: 
Chris@480:         if (m_reporter) {
Chris@480:             if (resultCount >= resultTotal) {
Chris@480:                 if (m_reporter->isDefinite()) m_reporter->setDefinite(false);
Chris@480:                 m_reporter->setProgress(resultCount);
Chris@480:             } else {
Chris@480:                 m_reporter->setProgress((resultCount * 100) / resultTotal);
Chris@480:             }
Chris@480: 
Chris@480:             if (m_reporter->wasCancelled()) {
Chris@480:                 m_cancelled = true;
Chris@480:                 break;
Chris@480:             }
Chris@480:         }
Chris@480:     }
Chris@480: 
Chris@480:     librdf_free_query_results(results);
Chris@480:     librdf_free_query(query);
Chris@480: 
Chris@481: #ifdef DEBUG_SIMPLE_SPARQL_QUERY
Chris@492:     cerr << "SimpleSPARQLQuery::executeDatastore: All results retrieved (" << resultCount << " of them)" << endl;
Chris@481: #endif
Chris@480: 
Chris@480:     return list;
Chris@489: }
Chris@489: 
Chris@489: bool
Chris@489: SimpleSPARQLQuery::Impl::addSourceToModel(QString sourceUri)
Chris@489: {
Chris@489:     QString err;
Chris@489: 
Chris@490:     QMutexLocker locker(&m_mutex);
Chris@489: 
Chris@492:     if (!m_redland.isOK()) {
Chris@492:         std::cerr << "SimpleSPARQLQuery::addSourceToModel: Failed to initialise Redland datastore" << std::endl;
Chris@492:         return false;
Chris@489:     }
Chris@489: 
Chris@492:     if (!m_redland.loadUriIntoDefaultModel(sourceUri, err)) {
Chris@489:         std::cerr << "SimpleSPARQLQuery::addSourceToModel: Failed to add source URI \"" << sourceUri.toStdString() << ": " << err.toStdString() << std::endl;
Chris@489:         return false;
Chris@489:     }
Chris@489:     return true;
Chris@480: }
Chris@480: 
Chris@492: void
Chris@492: SimpleSPARQLQuery::Impl::closeSingleSource(QString sourceUri)
Chris@492: {
Chris@492:     QMutexLocker locker(&m_mutex);
Chris@492: 
Chris@492:     m_redland.freeModel(sourceUri);
Chris@492: }
Chris@492: 
Chris@440: SimpleSPARQLQuery::Value
Chris@489: SimpleSPARQLQuery::singleResultQuery(QueryType type,
Chris@480:                                      QString query, QString binding)
Chris@440: {
Chris@489:     SimpleSPARQLQuery q(type, query);
Chris@440:     ResultList results = q.execute();
Chris@440:     if (!q.isOK()) {
Chris@440:         cerr << "SimpleSPARQLQuery::singleResultQuery: ERROR: "
Chris@440:              << q.getErrorString().toStdString() << endl;
Chris@440:         return Value();
Chris@440:     }
Chris@440:     if (results.empty()) {
Chris@440:         return Value();
Chris@440:     }
Chris@440:     for (int i = 0; i < results.size(); ++i) {
Chris@440:         if (results[i].find(binding) != results[i].end() &&
Chris@440:             results[i][binding].type != NoValue) {
Chris@440:             return results[i][binding];
Chris@440:         }
Chris@440:     }
Chris@440:     return Value();
Chris@440: }
Chris@440: 
Chris@440: 
Chris@440: