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<?php
namespace SMW\Exporter;
use SMW\ApplicationFactory;
use SMW\DataValueFactory;
use SMW\DIConcept;
use SMW\DIProperty;
use SMW\Exporter\Element\ExpResource;
use SMW\Query\Language\ClassDescription;
use SMW\Query\Language\ConceptDescription;
use SMW\Query\Language\Conjunction;
use SMW\Query\Language\Description;
use SMW\Query\Language\Disjunction;
use SMW\Query\Language\SomeProperty;
use SMW\Query\Language\ThingDescription;
use SMW\Query\Language\ValueDescription;
use SMWDataItem as DataItem;
use SMWExpData as ExpData;
use SMWExporter as Exporter;
/**
* @license GNU GPL v2+
* @since 2.4
*
* @author Markus Krötzsch
* @author mwjames
*/
class ConceptMapper {
/**
* @var Exporter
*/
private $exporter;
/**
* @since 2.4
*
* @param Exporter|null $exporter
*/
public function __construct( Exporter $exporter = null ) {
$this->exporter = $exporter;
if ( $this->exporter === null ) {
$this->exporter = Exporter::getInstance();
}
}
/**
* @since 2.4
*
* @param DataItem $dataItem
*
* @return boolean
*/
public function isMapperFor( DataItem $dataItem ) {
return $dataItem instanceof DIConcept;
}
/**
* @since 2.4
*
* @param DIConcept $concept
*
* @return ExpData|null
*/
public function getElementFor( DIConcept $concept ) {
$dataValue = DataValueFactory::getInstance()->newDataValueByItem(
$concept
);
if ( !$dataValue->isValid() ) {
return null;
}
$description = ApplicationFactory::getInstance()->newQueryParser()->getQueryDescription(
$dataValue->getWikiValue()
);
$exact = true;
$owlDescription = $this->getExpDataFromDescription( $description, $exact );
if ( $owlDescription === false ) {
$result = new ExpData(
$this->exporter->getSpecialNsResource( 'owl', 'Thing' )
);
return $result;
}
if ( $exact ) {
return $owlDescription;
}
$result = new ExpData(
new ExpResource( '' )
);
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'rdf', 'type' ),
new ExpData( $this->exporter->getSpecialNsResource( 'owl', 'Class' ) )
);
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'rdfs', 'subClassOf' ),
$owlDescription
);
return $result;
}
/**
* @since 2.4
*
* @param Description $description
*
* @param string &$exact
*
* @return Element|false
*/
public function getExpDataFromDescription( Description $description, &$exact ) {
if ( ( $description instanceof Conjunction ) || ( $description instanceof Disjunction ) ) {
$result = $this->doMapConjunctionDisjunction( $description, $exact );
} elseif ( $description instanceof ClassDescription ) {
$result = $this->doMapClassDescription( $description, $exact );
} elseif ( $description instanceof ConceptDescription ) {
$result = $this->doMapConceptDescription( $description, $exact );
} elseif ( $description instanceof SomeProperty ) {
$result = $this->doMapSomeProperty( $description, $exact );
} elseif ( $description instanceof ValueDescription ) {
$result = $this->doMapValueDescription( $description, $exact );
} elseif ( $description instanceof ThingDescription ) {
$result = false;
} else {
$result = false;
$exact = false;
}
return $result;
}
private function doMapValueDescription( ValueDescription $description, &$exact ) {
if ( $description->getComparator() === SMW_CMP_EQ ) {
$result = $this->exporter->getDataItemExpElement( $description->getDataItem() );
} else {
// OWL cannot represent <= and >= ...
$exact = false;
$result = false;
}
return $result;
}
private function doMapConceptDescription( ConceptDescription $description, &$exact ) {
$result = new ExpData(
$this->exporter->getResourceElementForWikiPage( $description->getConcept() )
);
return $result;
}
private function doMapSomeProperty( SomeProperty $description, &$exact ) {
$result = new ExpData(
new ExpResource( '' )
);
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'rdf', 'type' ),
new ExpData( $this->exporter->getSpecialNsResource( 'owl', 'Restriction' ) )
);
$property = $description->getProperty();
if ( $property->isInverse() ) {
$property = new DIProperty( $property->getKey() );
}
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'owl', 'onProperty' ),
new ExpData(
$this->exporter->getResourceElementForProperty( $property )
)
);
$subdata = $this->getExpDataFromDescription(
$description->getDescription(),
$exact
);
if ( ( $description->getDescription() instanceof ValueDescription ) &&
( $description->getDescription()->getComparator() === SMW_CMP_EQ ) ) {
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'owl', 'hasValue' ),
$subdata
);
} else {
if ( $subdata === false ) {
$owltype = $this->exporter->getOWLPropertyType(
$description->getProperty()->findPropertyTypeID()
);
if ( $owltype == 'ObjectProperty' ) {
$subdata = new ExpData(
$this->exporter->getSpecialNsResource( 'owl', 'Thing' )
);
} elseif ( $owltype == 'DatatypeProperty' ) {
$subdata = new ExpData(
$this->exporter->getSpecialNsResource( 'rdfs', 'Literal' )
);
} else { // no restrictions at all with annotation properties ...
return new ExpData(
$this->exporter->getSpecialNsResource( 'owl', 'Thing' )
);
}
}
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'owl', 'someValuesFrom' ),
$subdata
);
}
return $result;
}
private function doMapClassDescription( ClassDescription $description, &$exact ) {
if ( count( $description->getCategories() ) == 1 ) { // single category
$categories = $description->getCategories();
$result = new ExpData(
$this->exporter->getResourceElementForWikiPage( end( $categories ) )
);
} else { // disjunction of categories
$result = new ExpData(
new ExpResource( '' )
);
$elements = [];
foreach ( $description->getCategories() as $cat ) {
$elements[] = new ExpData(
$this->exporter->getResourceElementForWikiPage( $cat )
);
}
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'owl', 'unionOf' ),
ExpData::makeCollection( $elements )
);
}
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'rdf', 'type' ),
new ExpData(
$this->exporter->getSpecialNsResource( 'owl', 'Class' )
)
);
return $result;
}
private function doMapConjunctionDisjunction( Description $description, &$exact ) {
$result = new ExpData(
new ExpResource( '' )
);
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'rdf', 'type' ),
new ExpData(
$this->exporter->getSpecialNsResource( 'owl', 'Class' )
)
);
$elements = [];
foreach ( $description->getDescriptions() as $subdesc ) {
$element = $this->getExpDataFromDescription( $subdesc, $exact );
if ( $element === false ) {
$element = new ExpData(
$this->exporter->getSpecialNsResource( 'owl', 'Thing' )
);
}
$elements[] = $element;
}
$prop = $description instanceof Conjunction ? 'intersectionOf' : 'unionOf';
$result->addPropertyObjectValue(
$this->exporter->getSpecialNsResource( 'owl', $prop ),
ExpData::makeCollection( $elements )
);
return $result;
}
}
|
