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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() {
			return id(new PhutilClassMapQuery())
			->setAncestorClass(__CLASS__)
			->setUniqueMethod('getPostprocessorKey')
			->execute();
			}

			}