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<?php
namespace SMW\SPARQLStore\QueryEngine\DescriptionInterpreters;
use SMW\ApplicationFactory;
use SMW\DIProperty;
use SMW\DIWikiPage;
use SMW\Query\Language\ConceptDescription;
use SMW\Query\Language\Conjunction;
use SMW\Query\Language\Description;
use SMW\Query\Language\Disjunction;
use SMW\SPARQLStore\QueryEngine\Condition\FalseCondition;
use SMW\SPARQLStore\QueryEngine\ConditionBuilder;
use SMW\SPARQLStore\QueryEngine\DescriptionInterpreter;
use SMWExporter as Exporter;
/**
* @license GNU GPL v2+
* @since 2.1
*
* @author Markus Krötzsch
* @author mwjames
*/
class ConceptDescriptionInterpreter 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 ConceptDescription;
}
/**
* @since 2.2
*
* {@inheritDoc}
*/
public function interpretDescription( Description $description ) {
$joinVariable = $this->conditionBuilder->getJoinVariable();
$orderByProperty = $this->conditionBuilder->getOrderByProperty();
$conceptDescription = $this->getConceptDescription(
$description->getConcept()
);
if ( $conceptDescription === '' ) {
return new FalseCondition();
}
$hash = 'concept-' . $conceptDescription->getQueryString();
$this->conditionBuilder->getCircularReferenceGuard()->mark( $hash );
if ( $this->conditionBuilder->getCircularReferenceGuard()->isCircular( $hash ) ) {
$this->conditionBuilder->addError(
[ 'smw-query-condition-circular', $description->getQueryString() ]
);
return new FalseCondition();
}
$this->conditionBuilder->setJoinVariable( $joinVariable );
$this->conditionBuilder->setOrderByProperty( $orderByProperty );
$condition = $this->conditionBuilder->mapDescriptionToCondition(
$conceptDescription
);
$this->conditionBuilder->getCircularReferenceGuard()->unmark( $hash );
return $condition;
}
private function getConceptDescription( DIWikiPage $concept ) {
$applicationFactory = ApplicationFactory::getInstance();
$value = $applicationFactory->getStore()->getSemanticData( $concept )->getPropertyValues(
new DIProperty( '_CONC' )
);
if ( $value === null || $value === [] ) {
return '';
}
$value = end( $value );
$description = $applicationFactory->newQueryParser()->getQueryDescription(
$value->getConceptQuery()
);
$this->findCircularDescription( $concept, $description );
return $description;
}
private function findCircularDescription( $concept, $description ) {
if ( $description instanceof ConceptDescription ) {
if ( $description->getConcept()->equals( $concept ) ) {
$this->conditionBuilder->addError(
[ 'smw-query-condition-circular', $description->getQueryString() ]
);
return;
}
}
if ( $description instanceof Conjunction || $description instanceof Disjunction ) {
foreach ( $description->getDescriptions() as $desc ) {
$this->findCircularDescription( $concept, $desc );
}
}
}
}
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