protected function processUri($uri)
{
echo "Accessing {$uri}...\n";
$retries = 3;
while (true) {
try {
$graph = Graph::newAndLoad($uri);
break;
} catch (\Exception $e) {
$retries--;
if ($retries < 0) {
throw $e;
}
echo "Error! Sleeping for 10 secs, then retrying ({$retries} tries left)...\n";
sleep(10);
}
}
$triples = $graph->serialise('ntriples');
fwrite($this->handle, $triples);
$this->visited[] = $uri;
preg_match_all('/<(https?:\\/\\/[^>]*)>/', $triples, $matches);
foreach (array_unique($matches[1]) as $uri) {
$this->enqueue($uri);
}
}
/**
* Seed the themes
*
* return @void
*/
private function seedThemes()
{
$this->info('---- Seeding new themes ----');
$base_uri = $this->argument('uri');
$taxonomy_uri = $this->argument('taxonomy_uri');
if (empty($taxonomy_uri)) {
$taxonomy_uri = $base_uri;
}
// Try to get the themes from the ns.thedatatank.com (semantic data)
try {
$this->info('Trying to fetch triples from the uri: ' . $base_uri);
$themes_graph = Graph::newAndLoad($base_uri);
if ($themes_graph->isEmpty()) {
$this->info('We could not reach the online themes.');
} else {
$this->info('Found new themes online, removing the old ones.');
// Empty the themes table
\Theme::truncate();
}
// Fetch the resources with a skos:conceptScheme relationship
$resources = $themes_graph->allOfType('skos:ConceptScheme');
$taxonomy_uris = array();
foreach ($resources as $r) {
array_push($taxonomy_uris, $r->getUri());
}
if (!empty($taxonomy_uris)) {
if (count($taxonomy_uris) == 1) {
$taxonomy_uri = $taxonomy_uris[0];
} else {
// Check if one of the possible taxonomy uris compares to the uri of the document
foreach ($taxonomy_uris as $tax_uri) {
if ($base_uri == $tax_uri) {
$taxonomy_uri = $tax_uri;
break;
}
$this->error('None of the URIs that have the skos:ConceptScheme property matched the URI of the document, please specify the taxonomy URI as a second parameter.');
}
}
} else {
$this->error('No resource has been found with a property of skos:ConceptScheme.');
}
// Fetch all of the themes
foreach ($themes_graph->resourcesMatching('skos:inScheme') as $theme) {
if ($theme->get('skos:inScheme')->getUri() == $taxonomy_uri) {
$uri = $theme->getUri();
$label = $theme->getLiteral('rdfs:label');
if (!empty($label) && !empty($uri)) {
$label = $label->getValue();
$this->info('Added ' . $uri . ' with label ' . $label);
\Theme::create(array('uri' => $uri, 'label' => $label));
}
}
}
$this->info('Added new themes.');
} catch (Exception $ex) {
$this->info('An error occurred when we tried to fetch online themes.');
}
}
/**
* Seed the themes
*
* return @void
*/
private function seedThemes()
{
$this->command->info('---- DCAT Themes ----');
$uri = 'http://ns.thedatatank.com/dcat/themes#Taxonomy';
$themes_fetched = false;
// Try to get the themes from the ns.thedatatank.com (semantic data)
try {
$this->command->info('Trying to fetch new themes online.');
$themes_graph = Graph::newAndLoad($uri);
if ($themes_graph->isEmpty()) {
$this->command->info('We could not reach the online themes.');
} else {
$themes_fetched = true;
$this->command->info('Found new themes online, removing the old ones.');
// Empty the themes table
\Theme::truncate();
}
// Fetch all of the themes
foreach ($themes_graph->resourcesMatching('skos:inScheme') as $theme) {
if ($theme->get('skos:inScheme')->getUri() == $uri) {
$theme_uri = $theme->getUri();
$label = $theme->getLiteral('rdfs:label');
if (!empty($label) && !empty($theme_uri)) {
$label = $label->getValue();
$this->command->info('Added ' . $uri . ' with label ' . $label);
\Theme::create(array('uri' => $theme_uri, 'label' => $label));
}
}
}
$this->command->info('Added new themes.');
} catch (Exception $ex) {
$this->command->info('An error occurred when we tried to fetch online themes.');
}
// If it's not available, get them from a file (json)
if (!$themes_fetched) {
$this->command->info('Trying to fetch the themes from the local json file containing a default set of themes.');
$themes = json_decode(file_get_contents(app_path() . '/database/seeds/data/themes.json'));
if (!empty($themes)) {
$this->command->info('Found new themes, removing the old ones.');
// Empty the themes table
\Theme::truncate();
foreach ($themes as $theme) {
\Theme::create(array('uri' => $theme->uri, 'label' => $theme->label));
}
if (!empty($themes)) {
$this->command->info('Added themes from the local json file.');
}
} else {
$this->command->info('No themes were found in the local json file, the old ones will not be replaced.');
}
}
}
<?php
use EasyRdf\Graph;
use EasyRdf\Format;
use EasyRdf\Serialiser\GraphViz;
$app->get('/image', function () {
$graph = Graph::newAndLoad(site_base_uri() . '/asset/dataset/countries.rdf');
$format = Format::getFormat('png');
$viz = new GraphViz();
header("Content-Type: " . $format->getDefaultMimeType());
echo $viz->renderImage($graph, $format);
die;
})->name('home');
protected function open()
{
\EasyRdf\RdfNamespace::set('locn', 'http://www.w3.org/ns/locn#');
$graph = Graph::newAndLoad($this->extractor->uri, $this->extractor->format);
$this->datasets = $graph->allOfType('dcat:Dataset');
}
/**
* Fetch the default licenses
*
* @return \EasyRdf_Graph
*/
private function fetchDefaultGraph()
{
$license_uri = $this->licenses_uri . $this->DEFAULT_LICENSE . '.json';
return Graph::newAndLoad($license_uri, 'jsonld');
}
