testing

PhabricatorFileTransform.php
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			<?php

			abstract class PhabricatorFileTransform extends Phobject {

			abstract public function getTransformName();
			abstract public function getTransformKey();
			abstract public function canApplyTransform(PhabricatorFile $file);
			abstract public function applyTransform(PhabricatorFile $file);

			public function generateTransforms() {
			return array($this);
			}

			public static function getAllTransforms() {
			static $map;

			if ($map === null) {
			$xforms = id(new PhutilSymbolLoader())
			->setAncestorClass(__CLASS__)
			->loadObjects();

			$result = array();
			foreach ($xforms as $xform_template) {
			foreach ($xform_template->generateTransforms() as $xform) {
			$key = $xform->getTransformKey();
			if (isset($result[$key])) {
			throw new Exception(
			pht(
			'Two %s objects define the same transform key ("%s"), but '.
			'each transform must have a unique key.',
			__CLASS__,
			$key));
			}
			$result[$key] = $xform;
			}
			}

			$map = $result;
			}

			return $map;
			}

			}