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<?php
namespace SMW\Exporter\Element;
use InvalidArgumentException;
use RuntimeException;
use SMWDataItem as DataItem;
/**
* A single resource (individual) for export, as defined by a URI.
* This class can also be used to represent blank nodes: It is assumed that all
* objects of class ExpElement or any of its subclasses represent a blank
* node if their name is empty or of the form "_id" where "id" is any
* identifier string. IDs are local to the current context, such as a list of
* triples or an SMWExpData container.
*
* @license GNU GPL v2+
* @since 2.2
*
* @author Markus Krötzsch
* @author mwjames
*/
class ExpResource extends ExpElement {
/**
* @var string
*/
private $uri;
/**
* @var boolean
*/
public $isImported = false;
/**
* @note The given URI must not contain serialization-specific
* abbreviations or escapings, such as XML entities.
*
* @param string $uri The full URI
* @param DataItem|null $dataItem
*
* @throws InvalidArgumentException
*/
public function __construct( $uri, DataItem $dataItem = null ) {
if ( !is_string( $uri ) ) {
throw new InvalidArgumentException( '$uri needs to be a string' );
}
parent::__construct( $dataItem );
// https://www.w3.org/2011/rdf-wg/wiki/IRIs/RDFConceptsProposal
// "... characters “<”, “>”, “{”, “}”, “|”, “\”, “^”, “`”, ‘“’ (double quote),
// and “ ” (space) were allowed ... are not allowed in IRIs, Data
// containing these characters in %-encoded form is fine ..."
$this->uri = str_replace( [ '"' ], [ '%22' ], $uri );
}
/**
* Return true if this resource represents a blank node.
*
* @return boolean
*/
public function isBlankNode() {
return $this->uri === '' || $this->uri{0} == '_';
}
/**
* @since 2.5
*
* @return boolean
*/
public function isImported() {
return $this->isImported;
}
/**
* Get the URI of this resource. The result is a UTF-8 encoded URI (or
* IRI) without any escaping.
*
* @return string
*/
public function getUri() {
return $this->uri;
}
/**
* @since 2.2
*
* @return array
*/
public function getSerialization() {
$serialization = [
'type' => self::TYPE_RESOURCE,
'uri' => $this->getUri()
];
return $serialization + parent::getSerialization();
}
/**
* @see ExpElement::newFromSerialization
*/
protected static function deserialize( $serialization ) {
if ( !isset( $serialization['uri'] ) ) {
throw new RuntimeException( "Invalid serialization format" );
}
return new self(
$serialization['uri'],
$serialization['dataitem']
);
}
}
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