testing

PhabricatorExportEngineExtension.php
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			<?php

			abstract class PhabricatorExportEngineExtension 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;
			}

			abstract public function supportsObject($object);
			abstract public function newExportFields();
			abstract public function newExportData(array $objects);

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

			}