PhabricatorFactEngine.php
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PhabricatorFactEngine.php
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	<?php

	abstract class PhabricatorFactEngine extends Phobject {

	private $factMap;
	private $viewer;

	final public static function loadAllEngines() {
	return id(new PhutilClassMapQuery())
	->setAncestorClass(__CLASS__)
	->execute();
	}

	/**
	* @return array All types of facts known by this FactEngine
	*/
	abstract public function newFacts();

	/**
	* @return bool
	*/
	abstract public function supportsDatapointsForObject(
	PhabricatorLiskDAO $object);

	/**
	* Add new datapoints (due to a transaction) about an object
	*/
	abstract public function newDatapointsForObject(PhabricatorLiskDAO $object);

	final protected function getFact($key) {
	if ($this->factMap === null) {
	$facts = $this->newFacts();
	$facts = mpull($facts, null, 'getKey');
	$this->factMap = $facts;
	}

	if (!isset($this->factMap[$key])) {
	throw new Exception(
	pht(
	'Unknown fact ("%s") for engine "%s".',
	$key,
	get_class($this)));
	}

	return $this->factMap[$key];
	}

	public function setViewer(PhabricatorUser $viewer) {
	$this->viewer = $viewer;
	return $this;
	}

	public function getViewer() {
	if (!$this->viewer) {
	throw new PhutilInvalidStateException('setViewer');
	}

	return $this->viewer;
	}

	}