gordonbanderson / silverstripe-elastica

			$inSiteTree = $classname === 'SiteTree' ? true : false;

			if(isset(self::$site_tree_classes[$classname])) {

				$inSiteTree = self::$site_tree_classes[$classname];

			} else {

				$class = new \ReflectionClass($classname);

				while($class = $class->getParentClass()) {

					$parentClass = $class->getName();

					if($parentClass == 'SiteTree') {

						$inSiteTree = true;

						break;

					}

				}

				self::$site_tree_classes[$classname] = $inSiteTree;

			}

			if($inSiteTree) {

				// this prevents the same item being indexed twice due to class inheritance

	public static function isInSiteTree($classname) {

		$inSiteTree = ($classname === 'SiteTree' ? true : false);

		if(!$inSiteTree) {

			$class = new \ReflectionClass($classname);

			while($class = $class->getParentClass()) {

				$parentClass = $class->getName();

				if($parentClass == 'SiteTree') {

					$inSiteTree = true;

					break;

				}

			}

		}

		return $inSiteTree;

	}