/** Get or create a resource stored in a graph
*
* If the resource did not previously exist, then a new resource will
* be created. If you provide an RDF type and that type is registered
* with the EasyRdf_TypeMapper, then the resource will be an instance
* of the class registered.
*
* @param string $uri The URI of the resource
* @param mixed $types RDF type of a new resouce (e.g. foaf:Person)
* @return object EasyRdf_Resouce
*/
public function resource($uri, $types = array())
{
if (!is_string($uri) or $uri == null or $uri == '') {
throw new InvalidArgumentException("\$uri should be a string and cannot be null or empty");
}
// Expand the URI if it is shortened
$uri = EasyRdf_Namespace::expand($uri);
// Convert types to an array if it isn't one
if (!$types) {
$types = array();
} else {
if (!is_array($types)) {
$types = array($types);
}
}
// Create resource object if it doesn't already exist
if (!array_key_exists($uri, $this->_resources)) {
$resClass = 'EasyRdf_Resource';
foreach ($types as $type) {
$class = EasyRdf_TypeMapper::get($type);
if ($class != null) {
$resClass = $class;
break;
}
}
$this->_resources[$uri] = new $resClass($uri);
}
// Add the rdf:type triples
foreach ($types as $type) {
$type = $this->resource($type);
$this->_resources[$uri]->add('rdf:type', $type);
}
return $this->_resources[$uri];
}
/** Work out the class to instantiate a resource as
* @ignore
*/
protected function classForResource($uri)
{
$resClass = 'EasyRdf_Resource';
$rdfType = EasyRdf_Namespace::expand('rdf:type');
if (isset($this->_index[$uri][$rdfType])) {
foreach ($this->_index[$uri][$rdfType] as $type) {
if ($type['type'] == 'uri' or $type['type'] == 'bnode') {
$class = EasyRdf_TypeMapper::get($type['value']);
if ($class != null) {
$resClass = $class;
break;
}
}
}
}
return $resClass;
}
public function testDelete()
{
$this->assertSame('MyType_Class', EasyRdf_TypeMapper::get('rdf:mytype'));
EasyRdf_TypeMapper::delete('rdf:mytype');
$this->assertSame(NULL, EasyRdf_TypeMapper::get('rdf:mytype'));
}
/** Work out the class to instantiate a resource as
* @ignore
*/
protected function classForResource($uri)
{
$rdfType = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type';
if (isset($this->index[$uri][$rdfType])) {
foreach ($this->index[$uri][$rdfType] as $type) {
if ($type['type'] == 'uri' or $type['type'] == 'bnode') {
$class = EasyRdf_TypeMapper::get($type['value']);
if ($class != null) {
return $class;
}
}
}
}
// Parsers don't typically add a rdf:type to rdf:List, so we have to
// do a bit of 'inference' here using properties.
if ($uri == 'http://www.w3.org/1999/02/22-rdf-syntax-ns#nil' or isset($this->index[$uri]['http://www.w3.org/1999/02/22-rdf-syntax-ns#first']) or isset($this->index[$uri]['http://www.w3.org/1999/02/22-rdf-syntax-ns#rest'])) {
return 'EasyRdf_Collection';
}
return 'EasyRdf_Resource';
}
public function testDelete()
{
$this->assertEquals('MyType_Class', EasyRdf_TypeMapper::get('rdf:mytype'));
EasyRdf_TypeMapper::delete('rdf:mytype');
$this->assertEquals(null, EasyRdf_TypeMapper::get('rdf:mytype'));
}
