testing

CelerityPostprocessor.php
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			<?php

			abstract class CelerityPostprocessor
			extends Phobject {

			private $default;

			abstract public function getPostprocessorKey();
			abstract public function getPostprocessorName();
			abstract public function buildVariables();

			public function buildDefaultPostprocessor() {
			return new CelerityDefaultPostprocessor();
			}

			final public function getVariables() {
			$variables = $this->buildVariables();

			$default = $this->getDefault();
			if ($default) {
			$variables += $default->getVariables();
			}

			return $variables;
			}

			final public function getDefault() {
			if ($this->default === null) {
			$this->default = $this->buildDefaultPostprocessor();
			}
			return $this->default;
			}

			final public static function getPostprocessor($key) {
			return idx(self::getAllPostprocessors(), $key);
			}

			final public static function getAllPostprocessors() {
			static $postprocessors;

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

			$map = array();
			foreach ($objects as $object) {
			$key = $object->getPostprocessorKey();
			if (empty($map[$key])) {
			$map[$key] = $object;
			continue;
			}

			throw new Exception(
			pht(
			'Two postprocessors (of classes "%s" and "%s") define the same '.
			'postprocessor key ("%s"). Each postprocessor must define a '.
			'unique key.',
			get_class($object),
			get_class($map[$key]),
			$key));
			}
			$postprocessors = $map;
			}

			return $postprocessors;
			}

			}