wikimedia/mediawiki-extensions-Wikibase

<?php

namespace Wikibase\Repo\Rdf\Values;

use DataValues\DataValue;
use Wikibase\DataModel\Snak\PropertyValueSnak;
use Wikibase\Repo\Rdf\ValueSnakRdfBuilder;
use Wikimedia\Assert\Assert;
use Wikimedia\Purtle\RdfWriter;

/**
 * RDF mapping for DataValues that map to a literal.
 *
 * @license GPL-2.0-or-later
 * @author Daniel Kinzler
 * @author Stas Malyshev
 */
class LiteralValueRdfBuilder implements ValueSnakRdfBuilder {

    /**
     * @var string|null the base URI of the type
     */
    private $typeBase;

    /**
     * @var string|null the local name of the type
     */
    private $typeLocal;

    /**
     * @param string|null $typeBase
     * @param string|null $typeLocal
     */
    public function __construct( $typeBase, $typeLocal ) {
        Assert::parameterType( 'string|null', $typeBase, '$typeBase' );
        Assert::parameterType( 'string|null', $typeLocal, '$typeLocal' );

        $this->typeBase = $typeBase;
        $this->typeLocal = $typeLocal;
    }

    /**
     * Adds specific value
     *
     * @param RdfWriter $writer
     * @param string $propertyValueNamespace Property value relation namespace
     * @param string $propertyValueLName Property value relation name
     * @param string $dataType Property data type
     * @param string $snakNamespace
     * @param PropertyValueSnak $snak
     */
    public function addValue(
        RdfWriter $writer,
        $propertyValueNamespace,
        $propertyValueLName,
        $dataType,
        $snakNamespace,
        PropertyValueSnak $snak
    ) {
        $literalValue = $this->getLiteralValue( $snak->getDataValue() );
        $nsType = $this->typeBase ?: ( $this->typeLocal === null ? null : 'xsd' );

        $writer->say( $propertyValueNamespace, $propertyValueLName )
            ->value( $literalValue, $nsType, $this->typeLocal );
    }

    /**
     * @param DataValue $value
     *
     * @return string
     */
    protected function getLiteralValue( DataValue $value ) {
        return $value->getValue();
    }

}