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 getDefaultTransform(PhabricatorFile $file) {
			return null;
			}

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

			public function executeTransform(PhabricatorFile $file) {
			if ($this->canApplyTransform($file)) {
			try {
			return $this->applyTransform($file);
			} catch (Exception $ex) {
			// Ignore.
			}
			}

			return $this->getDefaultTransform($file);
			}

			public static function getAllTransforms() {
			return id(new PhutilClassMapQuery())
			->setAncestorClass(__CLASS__)
			->setExpandMethod('generateTransforms')
			->setUniqueMethod('getTransformKey')
			->execute();
			}

			public static function getTransformByKey($key) {
			$all = self::getAllTransforms();

			$xform = idx($all, $key);
			if (!$xform) {
			throw new Exception(
			pht(
			'No file transform with key "%s" exists.',
			$key));
			}

			return $xform;
			}

			}