PhabricatorFactEngine.php
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	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	abstract class PhabricatorFactEngine {

	final public static function loadAllEngines() {
	$classes = id(new PhutilSymbolLoader())
	->setAncestorClass(__CLASS__)
	->setConcreteOnly(true)
	->selectAndLoadSymbols();

	$objects = array();
	foreach ($classes as $class) {
	$objects[] = newv($class['name'], array());
	}

	return $objects;
	}

	public function getFactSpecs(array $fact_types) {
	return array();
	}

	public function shouldComputeRawFactsForObject(PhabricatorLiskDAO $object) {
	return false;
	}

	public function computeRawFactsForObject(PhabricatorLiskDAO $object) {
	return array();
	}

	public function shouldComputeAggregateFacts() {
	return false;
	}

	public function computeAggregateFacts() {
	return array();
	}

	}