PhabricatorFactSpec.php
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	<?php

	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() {
	return pht(
	'Fact (%s)',
	$this->getType());
	}

	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;
	}
	}

	}