PhabricatorFactSpec.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 PhabricatorFactSpec {

	const UNIT_COUNT = 'unit-count';
	const UNIT_EPOCH = 'unit-epoch';

	public static function newSpecsForFactTypes(
	array $engines,
	array $fact_types) {
	assert_instances_of($engines, 'PhabricatorFactEngine');

	$map = array();
	foreach ($engines as $engine) {
	$specs = $engine->getFactSpecs($fact_types);
	$specs = mpull($specs, null, 'getType');
	$map += $specs;
	}

	foreach ($fact_types as $type) {
	if (empty($map[$type])) {
	$map[$type] = new PhabricatorFactSimpleSpec($type);
	}
	}

	return $map;
	}

	abstract public function getType();

	public function getUnit() {
	return null;
	}

	public function getName() {
	$type = $this->getType();
	return "Fact ({$type})";
	}

	public function formatValueForDisplay(PhabricatorUser $user, $value) {
	$unit = $this->getUnit();
	switch ($unit) {
	case self::UNIT_COUNT:
	return number_format($value);
	case self::UNIT_EPOCH:
	return phabricator_datetime($value, $user);
	default:
	return $value;
	}
	}

	}