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|
<?php
namespace SMW\Exporter;
use RuntimeException;
use SMW\Exporter\Element\ExpLiteral;
use SMW\Exporter\Element\ExpResource;
use SMWDataItem as DataItem;
use SMWDITime as DITime;
use SMWExporter as Exporter;
/**
* @license GNU GPL v2+
* @since 2.2
*
* @author mwjames
* @author Markus Krötzsch
*/
class ElementFactory {
/**
* @var array
*/
private $dataItemMapper = [];
/**
* @var array
*/
private $dataItemToElementMapper = [];
/**
* @since 2.2
*
* @param integer $type
* @param Closure $dataItemEncoder
*/
public function registerDataItemMapper( $type, \Closure $dataItemEncoder ) {
$this->dataItemMapper[$type] = $dataItemEncoder;
}
/**
* Create an Element that encodes the data for the given dataitem object.
* This method is meant to be used when exporting a dataitem as a subject
* or object.
*
* @param DataItem $dataItem
*
* @return Element|null
* @throws RuntimeException
*/
public function newFromDataItem( DataItem $dataItem ) {
if ( $this->dataItemMapper === [] ) {
$this->initDataItemMap();
}
if ( $this->dataItemToElementMapper === [] ) {
$this->initDataItemToElementMapper();
}
$element = $this->findElementByDataItem( $dataItem );
if ( $element instanceof Element || $element === null ) {
return $element;
}
throw new RuntimeException( 'Encoder did not return a valid element' );
}
private function findElementByDataItem( $dataItem ) {
foreach ( $this->dataItemToElementMapper as $dataItemToElementMapper ) {
if ( $dataItemToElementMapper->isMapperFor( $dataItem ) ) {
return $dataItemToElementMapper->getElementFor( $dataItem );
}
}
foreach ( $this->dataItemMapper as $type => $callback ) {
if ( $type === $dataItem->getDIType() ) {
return $callback( $dataItem );
}
}
return null;
}
private function initDataItemToElementMapper() {
$this->dataItemToElementMapper[] = new ConceptMapper();
}
private function initDataItemMap() {
$lang = '';
$xsdValueMapper = new XsdValueMapper();
$this->registerDataItemMapper( DataItem::TYPE_NUMBER, function( $dataItem ) use ( $lang, $xsdValueMapper ) {
$xsdValueMapper->map( $dataItem );
return new ExpLiteral(
$xsdValueMapper->getXsdValue(),
$xsdValueMapper->getXsdType(),
$lang,
$dataItem
);
} );
$this->registerDataItemMapper( DataItem::TYPE_BLOB, function( $dataItem ) use ( $lang, $xsdValueMapper ) {
$xsdValueMapper->map( $dataItem );
return new ExpLiteral(
$xsdValueMapper->getXsdValue(),
$xsdValueMapper->getXsdType(),
$lang,
$dataItem
);
} );
$this->registerDataItemMapper( DataItem::TYPE_BOOLEAN, function( $dataItem ) use ( $lang, $xsdValueMapper ) {
$xsdValueMapper->map( $dataItem );
return new ExpLiteral(
$xsdValueMapper->getXsdValue(),
$xsdValueMapper->getXsdType(),
$lang,
$dataItem
);
} );
$this->registerDataItemMapper( DataItem::TYPE_URI, function( $dataItem ) {
return new ExpResource(
$dataItem->getURI(),
$dataItem
);
} );
$this->registerDataItemMapper( DataItem::TYPE_TIME, function( $dataItem ) use ( $lang, $xsdValueMapper ) {
$gregorianTime = $dataItem->getForCalendarModel( DITime::CM_GREGORIAN );
$xsdValueMapper->map( $gregorianTime );
return new ExpLiteral(
$xsdValueMapper->getXsdValue(),
$xsdValueMapper->getXsdType(),
$lang,
$gregorianTime
);
} );
$this->registerDataItemMapper( DataItem::TYPE_CONTAINER, function( $dataItem ) {
return Exporter::getInstance()->makeExportData(
$dataItem->getSemanticData()
);
} );
$this->registerDataItemMapper( DataItem::TYPE_WIKIPAGE, function( $dataItem ) {
return Exporter::getInstance()->getResourceElementForWikiPage(
$dataItem
);
} );
$this->registerDataItemMapper( DataItem::TYPE_PROPERTY, function( $dataItem ) {
return Exporter::getInstance()->getResourceElementForProperty(
$dataItem
);
} );
// Not implemented
$this->registerDataItemMapper( DataItem::TYPE_GEO, function( $dataItem ) {
return null;
} );
}
}
|
