1 files changed, 78 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/DataValues/ValueFormatters/DispatchingDataValueFormatter.php b/www/wiki/extensions/SemanticMediaWiki/src/DataValues/ValueFormatters/DispatchingDataValueFormatter.php
new file mode 100644
index 00000000..c8056a98
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/DataValues/ValueFormatters/DispatchingDataValueFormatter.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace SMW\DataValues\ValueFormatters;
+
+use RuntimeException;
+use SMWDataValue as DataValue;
+
+/**
+ * @private
+ *
+ * @license GNU GPL v2+
+ * @since 2.4
+ *
+ * @author mwjames
+ */
+class DispatchingDataValueFormatter {
+
+	/**
+	 * @var DataValueFormatter[]
+	 */
+	private $dataValueFormatters = [];
+
+	/**
+	 * @var DataValueFormatter[]
+	 */
+	private $defaultDataValueFormatters = [];
+
+	/**
+	 * @since  2.4
+	 *
+	 * @param DataValueFormatter $dataValueFormatter
+	 */
+	public function addDataValueFormatter( DataValueFormatter $dataValueFormatter ) {
+		$this->dataValueFormatters[] = $dataValueFormatter;
+	}
+
+	/**
+	 * DataValueFormatters registered with this method are validated after
+	 * DispatchingDataValueFormatter::getDataValueFormatterFor was not able to
+	 * match any Formatter. This to ensure that a distinct FooStringValueFormatter
+	 * is tried before the default StringValueFormatter.
+	 *
+	 * @since 2.4
+	 *
+	 * @param DataValueFormatter $dataValueFormatter
+	 */
+	public function addDefaultDataValueFormatter( DataValueFormatter $dataValueFormatter ) {
+		$this->defaultDataValueFormatters[] = $dataValueFormatter;
+	}
+
+	/**
+	 * @since 2.4
+	 *
+	 * @param DataValue $dataValue
+	 *
+	 * @return DataValueFormatter
+	 * @throws RuntimeException
+	 */
+	public function getDataValueFormatterFor( DataValue $dataValue ) {
+
+		foreach ( $this->dataValueFormatters as $dataValueFormatter ) {
+			if ( $dataValueFormatter->isFormatterFor( $dataValue ) ) {
+				$dataValueFormatter->setDataValue( $dataValue );
+				return $dataValueFormatter;
+			}
+		}
+
+		foreach ( $this->defaultDataValueFormatters as $dataValueFormatter ) {
+			if ( $dataValueFormatter->isFormatterFor( $dataValue ) ) {
+				$dataValueFormatter->setDataValue( $dataValue );
+				return $dataValueFormatter;
+			}
+		}
+
+		throw new RuntimeException( "The dispatcher could not match a DataValueFormatter for " . get_class( $dataValue ) );
+	}
+
+}