HeraldActionGroup.php
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			<?php

			abstract class HeraldActionGroup extends HeraldGroup {

			final public function getGroupKey() {
			$class = new ReflectionClass($this);

			$const = $class->getConstant('ACTIONGROUPKEY');
			if ($const === false) {
			throw new Exception(
			pht(
			'"%s" class "%s" must define a "%s" property.',
			__CLASS__,
			get_class($this),
			'ACTIONGROUPKEY'));
			}

			return $const;
			}

			final public static function getAllActionGroups() {
			return id(new PhutilClassMapQuery())
			->setAncestorClass(__CLASS__)
			->setUniqueMethod('getGroupKey')
			->setSortMethod('getSortKey')
			->execute();
			}
			}

phab/src/applications/herald/action/HeraldActionGroup.php2eab1c1943c5stable