/**
* 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());
}
<?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');
