/**
* @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;
}
/**
* 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";
}
/**
* 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;
}
