1 files changed, 119 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/NamespaceExaminer.php b/www/wiki/extensions/SemanticMediaWiki/src/NamespaceExaminer.php
new file mode 100644
index 00000000..113110a5
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/NamespaceExaminer.php
@@ -0,0 +1,119 @@
+<?php
+
+namespace SMW;
+
+use InvalidArgumentException;
+use MWNamespace;
+
+/**
+ * Examines if a specific namespace is enabled for the usage of the
+ * Semantic MediaWiki extension
+ *
+ * @license GNU GPL v2+
+ * @since 1.9
+ *
+ * @author mwjames
+ */
+class NamespaceExaminer {
+
+	/** @var array */
+	private static $instance = null;
+
+	/** @var array */
+	private $registeredNamespaces = [];
+
+	/**
+	 * @since 1.9
+	 *
+	 * @param array $registeredNamespaces
+	 */
+	public function __construct( array $registeredNamespaces ) {
+		$this->registeredNamespaces = $registeredNamespaces;
+	}
+
+	/**
+	 * Returns a static instance with an invoked global settings array
+	 *
+	 * @par Example:
+	 * @code
+	 *  \SMW\NamespaceExaminer::getInstance()->isSemanticEnabled( NS_MAIN )
+	 * @endcode
+	 *
+	 * @note Used in smwfIsSemanticsProcessed
+	 *
+	 * @since 1.9
+	 *
+	 * @return NamespaceExaminer
+	 */
+	public static function getInstance() {
+
+		if ( self::$instance === null ) {
+			self::$instance = self::newFromArray( Settings::newFromGlobals()->get( 'smwgNamespacesWithSemanticLinks' ) );
+		}
+
+		return self::$instance;
+	}
+
+	/**
+	 * Registers an array of available namespaces
+	 *
+	 * @par Example:
+	 * @code
+	 *  \SMW\NamespaceExaminer::newFromArray( array( ... ) )->isSemanticEnabled( NS_MAIN )
+	 * @endcode
+	 *
+	 * @since 1.9
+	 *
+	 * @return NamespaceExaminer
+	 */
+	public static function newFromArray( $registeredNamespaces ) {
+		return new self( $registeredNamespaces );
+	}
+
+	/**
+	 * Resets static instance
+	 *
+	 * @since 1.9
+	 */
+	public static function clear() {
+		self::$instance = null;
+	}
+
+	/**
+	 * Returns if a namespace is enabled for semantic processing
+	 *
+	 * @since 1.9
+	 *
+	 * @param integer $namespace
+	 *
+	 * @return boolean
+	 * @throws InvalidArgumentException
+	 */
+	public function isSemanticEnabled( $namespace ) {
+
+		if ( !is_int( $namespace ) ) {
+			throw new InvalidArgumentException( "{$namespace} is not a number" );
+		}
+
+		if ( !in_array( $namespace, MWNamespace::getValidNamespaces() ) ) {
+			// Bug 51435
+			return false;
+		}
+
+		return $this->isEnabled( $namespace );
+	}
+
+	/**
+	 * Asserts if a namespace is enabled
+	 *
+	 * @since 1.9
+	 *
+	 * @param integer $namespace
+	 *
+	 * @return boolean
+	 */
+	protected function isEnabled( $namespace ) {
+		return !empty( $this->registeredNamespaces[$namespace] );
+	}
+
+}