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PhabricatorEditEngineExtension.php
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			<?php

			abstract class PhabricatorEditEngineExtension extends Phobject {

			private $viewer;

			final public function getExtensionKey() {
			return $this->getPhobjectClassConstant('EXTENSIONKEY');
			}

			final public function setViewer($viewer) {
			$this->viewer = $viewer;
			return $this;
			}

			final public function getViewer() {
			return $this->viewer;
			}

			public function getExtensionPriority() {
			return 1000;
			}

			abstract public function isExtensionEnabled();
			abstract public function getExtensionName();

			abstract public function supportsObject(
			PhabricatorEditEngine $engine,
			PhabricatorApplicationTransactionInterface $object);

			abstract public function buildCustomEditFields(
			PhabricatorEditEngine $engine,
			PhabricatorApplicationTransactionInterface $object);

			public function newBulkEditGroups(PhabricatorEditEngine $engine) {
			return array();
			}

			final public static function getAllExtensions() {
			return id(new PhutilClassMapQuery())
			->setAncestorClass(__CLASS__)
			->setUniqueMethod('getExtensionKey')
			->setSortMethod('getExtensionPriority')
			->execute();
			}

			final public static function getAllEnabledExtensions() {
			$extensions = self::getAllExtensions();

			foreach ($extensions as $key => $extension) {
			if (!$extension->isExtensionEnabled()) {
			unset($extensions[$key]);
			}
			}

			return $extensions;
			}

			}