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<?php
namespace SMW\SPARQLStore\QueryEngine\DescriptionInterpreters;
use SMW\Query\Language\Description;
use SMW\Query\Language\NamespaceDescription;
use SMW\SPARQLStore\QueryEngine\Condition\WhereCondition;
use SMW\SPARQLStore\QueryEngine\ConditionBuilder;
use SMW\SPARQLStore\QueryEngine\DescriptionInterpreter;
use SMWDataItem as DataItem;
use SMWExpLiteral as ExpLiteral;
use SMWExporter as Exporter;
use SMWTurtleSerializer as TurtleSerializer;
/**
* @license GNU GPL v2+
* @since 2.1
*
* @author Markus Krötzsch
* @author mwjames
*/
class NamespaceDescriptionInterpreter implements DescriptionInterpreter {
/**
* @var ConditionBuilder
*/
private $conditionBuilder;
/**
* @var Exporter
*/
private $exporter;
/**
* @since 2.1
*
* @param ConditionBuilder|null $conditionBuilder
*/
public function __construct( ConditionBuilder $conditionBuilder = null ) {
$this->conditionBuilder = $conditionBuilder;
$this->exporter = Exporter::getInstance();
}
/**
* @since 2.2
*
* {@inheritDoc}
*/
public function canInterpretDescription( Description $description ) {
return $description instanceof NamespaceDescription;
}
/**
* @since 2.2
*
* {@inheritDoc}
*/
public function interpretDescription( Description $description ) {
$joinVariable = $this->conditionBuilder->getJoinVariable();
$orderByProperty = $this->conditionBuilder->getOrderByProperty();
$nspropExpElement = $this->exporter->getSpecialNsResource( 'swivt', 'wikiNamespace' );
$nsExpElement = new ExpLiteral( strval( $description->getNamespace() ), 'http://www.w3.org/2001/XMLSchema#integer' );
$nsName = TurtleSerializer::getTurtleNameForExpElement( $nsExpElement );
$condition = "{ ?$joinVariable " . $nspropExpElement->getQName() . " $nsName . }\n";
$result = new WhereCondition( $condition, true, [] );
$this->conditionBuilder->addOrderByDataForProperty(
$result,
$joinVariable,
$orderByProperty,
DataItem::TYPE_WIKIPAGE
);
return $result;
}
}
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