/**
* @param Resource|Graph $resourceOrGraph
* @param array $frame
*
* @return Graph
*/
public function getGraph($resourceOrGraph, $frame = null)
{
if ($resourceOrGraph instanceof Graph) {
return $resourceOrGraph;
}
return $resourceOrGraph->getGraph();
}
public function testMinus()
{
$graph1 = new Graph();
$graph1->add('http://www.example.com/jdoe#jdoe', 'foaf:name', 'John Doe');
$graph2 = new Graph();
$graph2->add('http://www.example.com/jdoe#jdoe', 'foaf:name', 'Foo Bar');
$uow = new UnitOfWork($this->manager, 'fooUrl');
$this->assertEquals(1, 1);
}
/**
* Method to serialise an EasyRdf\Graph to RDF/PHP
*
* http://n2.talis.com/wiki/RDF_PHP_Specification
* docs/appendix-a-rdf-formats-php.md
*
* @param Graph $graph An EasyRdf\Graph object.
* @param string $format The name of the format to convert to.
* @param array $options
*
* @return string The RDF in the new desired format.
* @throws Exception
*/
public function serialise(Graph $graph, $format, array $options = array())
{
parent::checkSerialiseParams($format);
if ($format != 'php') {
throw new Exception(__CLASS__ . " does not support: {$format}");
}
// Graph is already stored as RDF/PHP resource-centric array internally within the EasyRdf\Graph object
return $graph->toRdfPhp();
}
protected function processUri($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);
}
}
/**
* @throws \Twig_Error_Loader
*/
public function testSerialize()
{
$loader = new JsonLdFrameLoader();
$loader->addPath(__DIR__ . '/Fixtures', 'namespace');
$registry = new RdfNamespaceRegistry();
$foaf = new Graph('http://njh.me/foaf.rdf');
$foaf->parseFile(__DIR__ . '/Fixtures/foaf.rdf');
$graphProvider = new SimpleGraphProvider();
$metadataFactory = $this->getMockBuilder('Metadata\\MetadataFactory')->disableOriginalConstructor()->getMock();
// new MetadataFactory();
$resource = $foaf->primaryTopic();
$serializer = new JsonLdSerializer($registry, $loader, $graphProvider, $metadataFactory);
$serialized = $serializer->serialize($resource, '@namespace/frame.jsonld');
$decoded = json_decode($serialized, true);
$this->assertEquals($resource->get('foaf:name'), $decoded['@graph'][0]['foaf:name']);
}
/**
* Transforms the statements of a StatementIterator instance into a stream, a file for instance.
*
* @param StatementIterator $statements The StatementIterator containing all the Statements which
* should be serialized by the serializer.
* @param string|resource $outputStream filename or file pointer to the stream to where the serialization
* should be written.
* @param string $serialization The serialization which should be used. If null is given the
* serializer will either apply some default serialization, or
* the only one it is supporting, or will throw an Exception.
* @throws \Exception If unknown serilaization was given.
*/
public function serializeIteratorToStream(StatementIterator $statements, $outputStream, $serialization = null)
{
/*
* check parameter $outputStream
*/
if (is_resource($outputStream)) {
// use it as it is
} elseif (is_string($outputStream)) {
$outputStream = fopen($outputStream, 'w');
} else {
throw new \Exception('Parameter $outputStream is neither a string nor resource.');
}
// if no format was given, serialize to turtle.
if (null == $serialization) {
$format = 'turtle';
}
if (false === isset($this->serializationMap[$serialization])) {
throw new \Exception('Unknown serialization given: ' . $serialization);
}
$graph = new Graph();
// go through all statements
foreach ($statements as $statement) {
/*
* Handle subject
*/
$stmtSubject = $statement->getSubject();
if ($stmtSubject->isNamed()) {
$s = $stmtSubject->getUri();
} elseif ($stmtSubject->isBlank()) {
$s = $stmtSubject->getBlankId();
} else {
throw new \Exception('Subject can either be a blank node or an URI.');
}
/*
* Handle predicate
*/
$stmtPredicate = $statement->getPredicate();
if ($stmtPredicate->isNamed()) {
$p = $stmtPredicate->getUri();
} else {
throw new \Exception('Predicate can only be an URI.');
}
/*
* Handle object
*/
$stmtObject = $statement->getObject();
if ($stmtObject->isNamed()) {
$o = array('type' => 'uri', 'value' => $stmtObject->getUri());
} elseif ($stmtObject->isBlank()) {
$o = array('type' => 'bnode', 'value' => $stmtObject->getBlankId());
} elseif ($stmtObject->isLiteral()) {
$o = array('type' => 'literal', 'value' => $stmtObject->getValue());
} else {
throw new \Exception('Object can either be a blank node, an URI or literal.');
}
$graph->add($s, $p, $o);
}
fwrite($outputStream, $graph->serialise($this->serializationMap[$serialization]) . PHP_EOL);
}
/**
* 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.');
}
}
}
/**
* @ignore
*/
protected function serialiseSubjects(Graph $graph, $filterType)
{
$turtle = '';
foreach ($graph->resources() as $resource) {
/** @var $resource Resource */
// If the resource has no properties - don't serialise it
$properties = $resource->propertyUris();
if (count($properties) == 0) {
continue;
}
// Is this node of the right type?
$thisType = $resource->isBNode() ? 'bnode' : 'uri';
if ($thisType != $filterType) {
continue;
}
if ($thisType == 'bnode') {
$id = $resource->getBNodeId();
if (isset($this->outputtedBnodes[$id])) {
// Already been serialised
continue;
}
$this->outputtedBnodes[$id] = true;
$rpcount = $this->reversePropertyCount($resource);
if ($rpcount == 0) {
$turtle .= '[]';
} else {
$turtle .= $this->serialiseResource($resource);
}
} else {
$turtle .= $this->serialiseResource($resource);
}
$turtle .= $this->serialiseProperties($resource);
$turtle .= "\n";
}
return $turtle;
}
/**
* 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');
}
/**
* Serialise an EasyRdf\Graph into a JSON-LD document.
*
* @param Graph $graph An EasyRdf\Graph object.
* @param string $format The name of the format to convert to.
* @param array $options
*
* @return string The RDF in the new desired format.
* @throws Exception
*/
public function serialise(Graph $graph, $format, array $options = array())
{
parent::checkSerialiseParams($format);
if ($format != 'jsonld') {
throw new Exception(__CLASS__ . ' does not support: ' . $format);
}
$ld_graph = new LD\Graph();
$nodes = array();
// cache for id-to-node association
foreach ($graph->toRdfPhp() as $resource => $properties) {
if (array_key_exists($resource, $nodes)) {
$node = $nodes[$resource];
} else {
$node = $ld_graph->createNode($resource);
$nodes[$resource] = $node;
}
foreach ($properties as $property => $values) {
foreach ($values as $value) {
if ($value['type'] == 'bnode' or $value['type'] == 'uri') {
if (array_key_exists($value['value'], $nodes)) {
$_value = $nodes[$value['value']];
} else {
$_value = $ld_graph->createNode($value['value']);
$nodes[$value['value']] = $_value;
}
} elseif ($value['type'] == 'literal') {
if (isset($value['lang'])) {
$_value = new LD\LanguageTaggedString($value['value'], $value['lang']);
} elseif (isset($value['datatype'])) {
$_value = new LD\TypedValue($value['value'], $value['datatype']);
} else {
$_value = $value['value'];
}
} else {
throw new Exception("Unable to serialise object to JSON-LD: " . $value['type']);
}
if ($property == "http://www.w3.org/1999/02/22-rdf-syntax-ns#type") {
$node->addType($_value);
} else {
$node->addPropertyValue($property, $_value);
}
}
}
}
// OPTIONS
$use_native_types = !(isset($options['expand_native_types']) and $options['expand_native_types'] == true);
$should_compact = (isset($options['compact']) and $options['compact'] == true);
$should_frame = isset($options['frame']);
// expanded form
$data = $ld_graph->toJsonLd($use_native_types);
if ($should_frame) {
$data = LD\JsonLD::frame($data, $options['frame'], $options);
}
if ($should_compact) {
// compact form
$compact_context = isset($options['context']) ? $options['context'] : null;
$compact_options = array('useNativeTypes' => $use_native_types, 'base' => $graph->getUri());
$data = LD\JsonLD::compact($data, $compact_context, $compact_options);
}
return LD\JsonLD::toString($data);
}
/**
* temp function : converting a result to a graph.
*
* @param Result $result
*
* @return Graph
*/
private function resultToGraph($result)
{
if ($result instanceof Graph) {
return $result;
}
$graph = new Graph(null);
foreach ($result as $row) {
$graph->add($row->subject, $row->predicate, $row->object);
}
return $graph;
}
/**
* Parses a given stream and returns an iterator containing Statement instances representing the
* previously read data. The stream parses the data not as a whole but in chunks.
*
* @param string $inputStream Filename of the stream to parse which contains RDF
* serialized data.
* @param string $baseUri The base URI of the parsed content. If this URI is null
* the inputStreams URL is taken as base URI.
* @param string $serialization The serialization of the inputStream. If null is given
* the parser will either apply some standard serialization,
* or the only one it is supporting, or will try to guess
* the correct serialization, or will throw an Exception.
* Supported formats are a subset of the following:
* json, rdfxml, sparql-xml, rdfa, turtle, ntriples, n3
* @return StatementIterator A StatementIterator containing all the Statements parsed by the parser to
* far.
* @throws \Exception If the base URI $baseUri is no valid URI.
*/
public function parseStreamToIterator($inputStream, $baseUri = null, $serialization = null)
{
$graph = new Graph();
// let EasyRdf guess the format
if ($serialization === null) {
// use PHP's file:// stream, if its a local file
if (false === strpos($inputStream, '://')) {
$inputStream = 'file://' . $inputStream;
}
$serialization = Format::guessFormat(file_get_contents($inputStream));
} else {
$serialization = Format::getFormat($serialization);
}
// if format is still null, throw exception, because we dont know what format the given stream is
if (null === $serialization) {
throw new \Exception('Either given $format is unknown or i could not guess format.');
}
$graph->parseFile($inputStream, $serialization->getName());
// transform parsed data to PHP array
return $this->rdfPhpToStatementIterator($graph->toRdfPhp());
}
/**
*
*/
public function setBNodes($uri, $property, Graph $graph)
{
$uri = $this->_rm->getNamespaceRegistry()->expand($uri);
if (empty($this->registeredResources[$uri])) {
throw new Exception('no parent resource');
}
/** @var \Conjecto\Nemrod\Resource $owningResource */
$owningResource = $this->registeredResources[$uri];
/* @var Graph $graph */
$owningGraph = $owningResource->getGraph();
$owningGraph->delete($uri, $property);
/** @var BaseResource $res */
foreach ($graph->allResources($uri, $property) as $res) {
$bnode = $owningGraph->newBNode();
$owningGraph->add($uri, $property, $bnode);
$rdfPhp = $res->getGraph()->toRdfPhp();
//
if (!empty($rdfPhp[$res->getUri()])) {
foreach ($rdfPhp[$res->getUri()] as $prop => $vals) {
foreach ($vals as $val) {
$bnode->set($prop, $val['value']);
}
}
}
}
}
<?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');
/**
* Internal function to serialise an EasyRdf\Graph into a DOT formatted string
*
* @ignore
*/
protected function serialiseDot(Graph $graph)
{
$result = "digraph {\n";
// Write the graph attributes
foreach ($this->attributes as $k => $v) {
$result .= ' ' . $this->escape($k) . '=' . $this->escape($v) . ";\n";
}
// Go through each of the properties and write the edges
$nodes = array();
$result .= "\n // Edges\n";
foreach ($graph->resources() as $resource) {
$name1 = $this->nodeName($resource);
foreach ($resource->propertyUris() as $property) {
$label = null;
if ($this->useLabels) {
$label = $graph->resource($property)->label();
}
if ($label === null) {
if ($this->onlyLabelled == true) {
continue;
} else {
$label = RdfNamespace::shorten($property);
}
}
foreach ($resource->all("<{$property}>") as $value) {
$name2 = $this->nodeName($value);
$nodes[$name1] = $resource;
$nodes[$name2] = $value;
$result .= $this->serialiseRow($name1, $name2, array('label' => $label));
}
}
}
ksort($nodes);
$result .= "\n // Nodes\n";
foreach ($nodes as $name => $node) {
$type = substr($name, 0, 1);
$label = '';
if ($type == 'R') {
if ($this->useLabels) {
$label = $node->label();
}
if (!$label) {
$label = $node->shorten();
}
if (!$label) {
$label = $node->getURI();
}
$result .= $this->serialiseRow($name, null, array('URL' => $node->getURI(), 'label' => $label, 'shape' => 'ellipse', 'color' => 'blue'));
} elseif ($type == 'B') {
if ($this->useLabels) {
$label = $node->label();
}
$result .= $this->serialiseRow($name, null, array('label' => $label, 'shape' => 'circle', 'color' => 'green'));
} else {
$result .= $this->serialiseRow($name, null, array('label' => strval($node), 'shape' => 'record'));
}
}
$result .= "}\n";
return $result;
}
/**
* Serialise an EasyRdf\Graph into N-Triples
*
* @param Graph $graph An EasyRdf\Graph object.
* @param string $format The name of the format to convert to.
* @param array $options
*
* @return string The RDF in the new desired format.
* @throws Exception
*/
public function serialise(Graph $graph, $format, array $options = array())
{
parent::checkSerialiseParams($format);
if ($format == 'ntriples') {
$nt = '';
foreach ($graph->toRdfPhp() as $resource => $properties) {
foreach ($properties as $property => $values) {
foreach ($values as $value) {
$nt .= $this->serialiseResource($resource) . " ";
$nt .= "<" . $this->escapeString($property) . "> ";
$nt .= $this->serialiseValue($value) . " .\n";
}
}
}
return $nt;
} else {
throw new Exception(__CLASS__ . " does not support: {$format}");
}
}
/**
* @return object|array|scalar
*/
public function getResult()
{
return $this->graph->serialise($this->format, $this->options);
}
/**
* @param UnitOfWork $uow
*/
public function __construct(UnitOfWork $uow)
{
parent::__construct();
$this->unitOfWork = $uow;
}
/**
* Return a DCAT document based on the definitions that are passed
*
* @param array Array with definition configurations
*
* @return \EasyRdf_Graph
*/
public function getDcatDocument(array $definitions, $oldest_definition)
{
// Create a new EasyRDF graph
$graph = new Graph();
$all_settings = $this->settings->getAll();
$uri = \Request::root();
// Add the catalog and a title
$graph->addResource($uri . '/api/dcat', 'a', 'dcat:Catalog');
$graph->addLiteral($uri . '/api/dcat', 'dct:title', $all_settings['catalog_title']);
// Fetch the catalog description, issued date and language
$graph->addLiteral($uri . '/api/dcat', 'dct:description', $all_settings['catalog_description']);
$graph->addLiteral($uri . '/api/dcat', 'dct:issued', $this->getIssuedDate());
$lang = $this->languages->getByCode($all_settings['catalog_language']);
if (!empty($lang)) {
$graph->addResource($uri . '/api/dcat', 'dct:language', 'http://lexvo.org/id/iso639-3/' . $lang['lang_id']);
$graph->addResource('http://lexvo.org/id/iso639-3/' . $lang['lang_id'], 'a', 'dct:LinguisticSystem');
}
// Fetch the homepage and rights
$graph->addResource($uri . '/api/dcat', 'foaf:homepage', $uri);
$graph->addResource($uri . '/api/dcat', 'dct:license', 'http://www.opendefinition.org/licenses/cc-zero');
$graph->addResource('http://www.opendefinition.org/licenses/cc-zero', 'a', 'dct:LicenseDocument');
// Add the publisher resource to the catalog
$graph->addResource($uri . '/api/dcat', 'dct:publisher', $all_settings['catalog_publisher_uri']);
$graph->addResource($all_settings['catalog_publisher_uri'], 'a', 'foaf:Agent');
$graph->addLiteral($all_settings['catalog_publisher_uri'], 'foaf:name', $all_settings['catalog_publisher_name']);
if (count($definitions) > 0) {
// Add the last modified timestamp in ISO8601
$graph->addLiteral($uri . '/api/dcat', 'dct:modified', date(\DateTime::ISO8601, strtotime($oldest_definition['updated_at'])));
foreach ($definitions as $definition) {
if ($definition['source_type'] != "InspireDefinition" && $definition['source_type'] != "RemoteDefinition") {
// Create the dataset uri
$dataset_uri = $uri . "/" . $definition['collection_uri'] . "/" . $definition['resource_name'];
$dataset_uri = str_replace(' ', '%20', $dataset_uri);
$source_type = $definition['type'];
// Add the dataset link to the catalog
$graph->addResource($uri . '/api/dcat', 'dcat:dataset', $dataset_uri);
// Add the dataset resource and its description
$graph->addResource($dataset_uri, 'a', 'dcat:Dataset');
$title = null;
if (!empty($definition['title'])) {
$title = $definition['title'];
} else {
$title = $definition['collection_uri'] . '/' . $definition['resource_name'];
}
$graph->addLiteral($dataset_uri, 'dct:title', $title);
// Add the description, identifier, issued date, modified date, contact point and landing page of the dataset
$graph->addLiteral($dataset_uri, 'dct:description', @$definition['description']);
$graph->addLiteral($dataset_uri, 'dct:identifier', str_replace(' ', '%20', $definition['collection_uri'] . '/' . $definition['resource_name']));
$graph->addLiteral($dataset_uri, 'dct:issued', date(\DateTime::ISO8601, strtotime($definition['created_at'])));
$graph->addLiteral($dataset_uri, 'dct:modified', date(\DateTime::ISO8601, strtotime($definition['updated_at'])));
$graph->addResource($dataset_uri, 'dcat:landingPage', $dataset_uri);
// Backwards compatibility
if (!empty($definition['contact_point'])) {
$graph->addResource($dataset_uri, 'dcat:contactPoint', $definition['contact_point']);
}
// Add the publisher resource to the dataset
if (!empty($definition['publisher_name']) && !empty($definition['publisher_uri'])) {
$graph->addResource($dataset_uri, 'dct:publisher', $definition['publisher_uri']);
$graph->addResource($definition['publisher_uri'], 'a', 'foaf:Agent');
$graph->addLiteral($definition['publisher_uri'], 'foaf:name', $definition['publisher_name']);
}
// Add the keywords to the dataset
if (!empty($definition['keywords'])) {
foreach (explode(',', $definition['keywords']) as $keyword) {
$keyword = trim($keyword);
$graph->addLiteral($dataset_uri, 'dcat:keyword', $keyword);
}
}
// Add the source resource if it's a URI
if (strpos($definition['source'], 'http://') !== false || strpos($definition['source'], 'https://')) {
$graph->addResource($dataset_uri, 'dct:source', str_replace(' ', '%20', $definition['source']));
}
// Optional dct terms
$optional = array('date', 'language', 'theme');
foreach ($optional as $dc_term) {
if (!empty($definition[$dc_term])) {
if ($dc_term == 'language') {
$lang = $this->languages->getByName($definition[$dc_term]);
if (!empty($lang)) {
$graph->addResource($dataset_uri, 'dct:' . $dc_term, 'http://lexvo.org/id/iso639-3/' . $lang['lang_id']);
$graph->addResource('http://lexvo.org/id/iso639-3/' . $lang['lang_id'], 'a', 'dct:LinguisticSystem');
}
} elseif ($dc_term == 'theme') {
$theme = $this->themes->getByLabel($definition[$dc_term]);
if (!empty($theme)) {
$graph->addResource($dataset_uri, 'dcat:' . $dc_term, $theme['uri']);
$graph->addLiteral($theme['uri'], 'rdfs:label', $theme['label']);
}
} else {
$graph->addLiteral($dataset_uri, 'dct:' . $dc_term, $definition[$dc_term]);
}
}
}
// Add the distribution of the dataset
if ($this->isDataGeoFormatted($definition)) {
$distribution_uri = $dataset_uri . '.geojson';
} else {
$distribution_uri = $dataset_uri . '.json';
}
// Check for spatial properties:
if (!empty($definition['spatial']['geometry']['geometry'])) {
$spatial = $graph->newBNode();
$spatial->setType('dct:Location');
$geometry_literal = new Literal($definition['spatial']['geometry']['geometry'], '', '<https://www.iana.org/assignments/media-types/application/vnd.geo+json>');
$spatial->addLiteral('locn:geometry', $geometry_literal);
if (!empty($definition['spatial']['label']['label'])) {
$spatial->addLiteral('skos:prefLabel', $definition['spatial']['label']['label']);
}
$graph->addResource($dataset_uri, 'dct:spatial', $spatial);
}
// Check for attribution properties:
if (!empty($definition['attributions'])) {
foreach ($definition['attributions'] as $attribution) {
$attribution_node = $graph->newBNode();
$attribution_node->setType('prov:Attribution');
$vcard = $graph->newBNode();
$vcard->setType('vcard:Kind');
$vcard->addLiteral('vcard:fn', $attribution['name']);
$vcard->addResource('vcard:hasEmail', 'mailto:' . $attribution['email']);
$attribution_node->addResource('prov:Agent', $vcard);
$attribution_node->addResource('dc:type', 'http://inspire.ec.europa.eu/metadata-codelist/ResponsiblePartyRole/' . $attribution['role']);
$graph->addResource($dataset_uri, 'prov:qualifiedAttribution', $attribution_node);
}
}
$graph->addResource($dataset_uri, 'dcat:distribution', $distribution_uri);
$graph->addResource($distribution_uri, 'a', 'dcat:Distribution');
$graph->addResource($distribution_uri, 'dcat:accessURL', $dataset_uri);
$graph->addResource($distribution_uri, 'dcat:downloadURL', $distribution_uri);
$graph->addLiteral($distribution_uri, 'dct:title', $title);
$graph->addLiteral($distribution_uri, 'dct:description', 'A json feed of ' . $dataset_uri);
$graph->addLiteral($distribution_uri, 'dcat:mediaType', 'application/json');
$graph->addLiteral($distribution_uri, 'dct:issued', date(\DateTime::ISO8601, strtotime($definition['created_at'])));
// Add the license to the distribution
if (!empty($definition['rights'])) {
$license = $this->licenses->getByTitle($definition['rights']);
if (!empty($license) && !empty($license['url'])) {
$graph->addResource($dataset_uri . '.json', 'dct:license', $license['url']);
$graph->addResource($license['url'], 'a', 'dct:LicenseDocument');
}
}
} else {
$turtle_parser = new Turtle();
$tmp_graph = new Graph();
$turtle_parser->parse($graph, $definition['dcat'], 'turtle', 'http://foo.bar');
}
}
}
return $graph;
}
public static function getBody($dataObj)
{
// Query parameters
$query_string = '';
if (!empty($_GET)) {
$get_params = \Input::get();
foreach ($get_params as $param => $val) {
if (!empty($val)) {
$query_string .= "&{$param}={$val}";
}
}
if (!empty($query_string)) {
$query_string = trim($query_string, '&');
$query_string = '?' . $query_string;
}
}
// Links to pages
$prev_link = '';
$next_link = '';
if (!empty($dataObj->paging)) {
$input_array = array_except(\Input::get(), array('limit', 'offset'));
$query_string = '';
if (!empty($input_array)) {
foreach ($get_params as $param => $val) {
if (!empty($val)) {
$query_string .= "&{$param}={$val}";
}
}
if (!empty($query_string)) {
$query_string = trim($query_string, '&');
$query_string = '?' . $query_string;
}
}
if (!empty($dataObj->paging['previous'])) {
$prev_link = '?offset=' . $dataObj->paging['previous'][0] . '&limit=' . $dataObj->paging['previous'][1] . $query_string;
}
if (!empty($dataObj->paging['next'])) {
$next_link = '?offset=' . $dataObj->paging['next'][0] . '&limit=' . $dataObj->paging['next'][1] . $query_string;
}
}
// Create the link to the dataset
$dataset_link = \URL::to($dataObj->definition['collection_uri'] . "/" . $dataObj->definition['resource_name'], [], \Config::get('app.ssl_enabled'));
// Append rest parameters
if (!empty($dataObj->rest_parameters)) {
$dataset_link .= '/' . implode('/', $dataObj->rest_parameters);
}
if (!empty($dataObj->source_definition)) {
$type = $dataObj->source_definition['type'];
// Check if other views need to be served
switch ($type) {
case 'XLS':
case 'CSV':
$first_row = array_shift($dataObj->data);
array_unshift($dataObj->data, $first_row);
if (is_array($first_row) || is_object($first_row)) {
$view = 'dataset.tabular';
$data = $dataObj->data;
} else {
$view = 'dataset.code';
$data = self::displayTree($dataObj->data);
}
break;
case 'KML':
case 'SHP':
$view = 'dataset.map';
$data = $dataset_link . '.map' . $query_string;
break;
case 'XML':
$view = 'dataset.code';
$data = self::displayTree($dataObj->data, 'xml');
break;
case 'INSPIRE':
$view = 'dataset.inspire';
$definitions = \App::make('Tdt\\Core\\Repositories\\Interfaces\\DefinitionRepositoryInterface');
$properties = $definitions->getCreateParameters();
$data = ['properties' => $properties];
break;
case 'REMOTE':
$view = 'dataset.remote';
$definitions = \App::make('Tdt\\Core\\Repositories\\Interfaces\\DefinitionRepositoryInterface');
$properties = $definitions->getCreateParameters();
$data = ['properties' => $properties];
break;
default:
if ($dataObj->is_semantic) {
// This data object is always semantic
$view = 'dataset.turtle';
// Check if a configuration is given
$conf = array();
if (!empty($dataObj->semantic->conf)) {
$conf = $dataObj->semantic->conf;
}
$data = $dataObj->data->serialise('turtle');
} elseif ($type == 'SPARQL' && $dataObj->source_definition['query_type'] == 'select') {
$data = CSVFormatter::buildTableFromSparqlResult($dataObj->data);
$first_row = array_shift($data);
array_unshift($data, $first_row);
if (is_array($first_row) || is_object($first_row)) {
$view = 'dataset.tabular';
$data = $data;
}
} else {
$view = 'dataset.code';
$data = self::displayTree($dataObj->data);
}
break;
}
} elseif ($dataObj->is_semantic) {
// The data object can be semantic without a specified source type
$view = 'dataset.code';
$data = $dataObj->data->serialise('turtle');
} else {
// Collection view
$view = 'dataset.collection';
$data = $dataObj->data;
}
// Gather meta-data to inject as a JSON-LD document so it can be picked up by search engines
$definition = $dataObj->definition;
$uri = \Request::root();
$graph = new Graph();
// Create the dataset uri
$dataset_uri = $uri . "/" . $definition['collection_uri'] . "/" . $definition['resource_name'];
$dataset_uri = str_replace(' ', '%20', $dataset_uri);
// Add the dataset resource and its description
$graph->addResource($dataset_uri, 'a', 'schema:Dataset');
// Add the title to the dataset resource of the catalog
if (!empty($definition['title'])) {
$graph->addLiteral($dataset_uri, 'schema:headline', $definition['title']);
}
// Add the description, identifier, issues, modified of the dataset
$graph->addLiteral($dataset_uri, 'schema:description', @$definition['description']);
$graph->addLiteral($dataset_uri, 'schema:dateCreated', date(\DateTime::ISO8601, strtotime($definition['created_at'])));
$graph->addLiteral($dataset_uri, 'schema:dateModified', date(\DateTime::ISO8601, strtotime($definition['updated_at'])));
// Add the publisher resource to the dataset
if (!empty($definition['publisher_name']) && !empty($definition['publisher_uri'])) {
$graph->addResource($dataset_uri, 'schema:publisher', $definition['publisher_uri']);
}
// Optional dct terms
$optional = array('date', 'language');
$languages = \App::make('Tdt\\Core\\Repositories\\Interfaces\\LanguageRepositoryInterface');
$licenses = \App::make('Tdt\\Core\\Repositories\\Interfaces\\LicenseRepositoryInterface');
foreach ($optional as $dc_term) {
if (!empty($definition[$dc_term])) {
if ($dc_term == 'language') {
$lang = $languages->getByName($definition[$dc_term]);
if (!empty($lang)) {
$graph->addResource($dataset_uri, 'schema:inLanguage', 'http://lexvo.org/id/iso639-3/' . $lang['lang_id']);
}
} else {
$graph->addLiteral($dataset_uri, 'schema:datasetTimeInterval', $definition[$dc_term]);
}
}
}
// Add the distribution of the dataset for SEO
$format = '.json';
if ($definition['source_type'] == 'ShpDefinition' || $dataObj->source_definition['type'] == 'KML') {
$format = '.geojson';
}
$dataDownload = $graph->newBNode();
$graph->addResource($dataset_uri, 'schema:distribution', $dataDownload);
$graph->addResource($dataDownload, 'a', 'schema:DataDownload');
$graph->addResource($dataDownload, 'schema:contentUrl', $dataset_uri . $format);
// Add the license to the distribution
if (!empty($definition['rights'])) {
$license = $licenses->getByTitle($definition['rights']);
if (!empty($license) && !empty($license['url'])) {
$graph->addResource($dataset_uri, 'schema:license', $license['url']);
}
if (!empty($license)) {
$dataObj->definition['rights_uri'] = $license['url'];
}
}
$jsonld = $graph->serialise('jsonld');
// Render the view
return \View::make($view)->with('title', 'Dataset: ' . $dataObj->definition['collection_uri'] . "/" . $dataObj->definition['resource_name'] . ' | The Datatank')->with('body', $data)->with('page_title', $dataObj->definition['collection_uri'] . "/" . $dataObj->definition['resource_name'])->with('definition', $dataObj->definition)->with('paging', $dataObj->paging)->with('source_definition', $dataObj->source_definition)->with('formats', $dataObj->formats)->with('dataset_link', $dataset_link)->with('prev_link', $prev_link)->with('next_link', $next_link)->with('query_string', $query_string)->with('json_ld', $jsonld);
}
/**
* Method to serialise an EasyRdf\Graph to RDF/XML
*
* @param Graph $graph An EasyRdf\Graph object.
* @param string $format The name of the format to convert to.
* @param array $options
*
* @return string The RDF in the new desired format.
* @throws Exception
*/
public function serialise(Graph $graph, $format, array $options = array())
{
parent::checkSerialiseParams($format);
if ($format != 'rdfxml') {
throw new Exception("EasyRdf\\Serialiser\\RdfXml does not support: {$format}");
}
// store of namespaces to be appended to the rdf:RDF tag
$this->prefixes = array('rdf' => true);
// store of the resource URIs we have serialised
$this->outputtedResources = array();
$xml = '';
// Serialise URIs first
foreach ($graph->resources() as $resource) {
if (!$resource->isBnode()) {
$xml .= $this->rdfxmlResource($resource, true);
}
}
// Serialise bnodes afterwards
foreach ($graph->resources() as $resource) {
if ($resource->isBnode()) {
$xml .= $this->rdfxmlResource($resource, true);
}
}
// iterate through namepsaces array prefix and output a string.
$namespaceStr = '';
foreach ($this->prefixes as $prefix => $count) {
$url = RdfNamespace::get($prefix);
if (strlen($namespaceStr)) {
$namespaceStr .= "\n ";
}
if (strlen($prefix) === 0) {
$namespaceStr .= ' xmlns="' . htmlspecialchars($url) . '"';
} else {
$namespaceStr .= ' xmlns:' . $prefix . '="' . htmlspecialchars($url) . '"';
}
}
return "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" . "<rdf:RDF" . $namespaceStr . ">\n" . $xml . "\n</rdf:RDF>\n";
}
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');
}