SPARQLService.cpp

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/*
 * This file is part of KnowRob, please consult
 * https://github.com/knowrob/knowrob for license details.
 */
 
#include "knowrob/semweb/SPARQLService.h"
#include "knowrob/storage/StorageError.h"
 
using namespace knowrob;
 
SPARQLService::SPARQLService(const URI &uri, semweb::TripleFormat format)
        : SPARQLService::SPARQLService(uri, semweb::tripleFormatToString(format)) {
}
 
SPARQLService::SPARQLService(const URI &uri, std::string_view format)
        : OntologySource(uri, format) {
    // create a Redland model for the SPARQL endpoint
    // Note that the model has interfaces for insert and remove triples, these won't
    // interact with the SPARQL endpoint, but with the local storage of the model.
    model_.setStorageType(RedlandStorageType::MEMORY);
    model_.setOrigin(origin_);
    if (!model_.initializeBackend()) {
        throw StorageError("Failed to initialize Redland backend for SPARQL endpoint at \"{}\".", uri());
    }
    // set up the model to interface with the SPARQL endpoint
    if (!model_.load(uri, semweb::tripleFormatFromString(format))) {
        throw StorageError("Failed to load URI of SPARQL endpoint at \"{}\".", uri());
    }
}
 
bool SPARQLService::load(const TripleHandler &callback) {
    // iterate over all triples in the SPARQL endpoint
    model_.batch(callback);
    return true;
}