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PhabricatorGuidanceEngineExtension.php
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			<?php

			abstract class PhabricatorGuidanceEngineExtension
			extends Phobject {

			final public function getExtensionKey() {
			return $this->getPhobjectClassConstant('GUIDANCEKEY', 64);
			}

			abstract public function canGenerateGuidance(
			PhabricatorGuidanceContext $context);

			abstract public function generateGuidance(
			PhabricatorGuidanceContext $context);

			public function didGenerateGuidance(
			PhabricatorGuidanceContext $context,
			array $guidance) {
			return $guidance;
			}

			final protected function newGuidance($key) {
			return id(new PhabricatorGuidanceMessage())
			->setKey($key);
			}

			final protected function newWarning($key) {
			return $this->newGuidance($key)
			->setSeverity(PhabricatorGuidanceMessage::SEVERITY_WARNING);
			}

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

			}