1 files changed, 176 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/Exporter/ElementFactory.php b/www/wiki/extensions/SemanticMediaWiki/src/Exporter/ElementFactory.php
new file mode 100644
index 00000000..bfb45077
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/Exporter/ElementFactory.php
@@ -0,0 +1,176 @@
+<?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;
+		} );
+	}
+
+}