PhabricatorSubscriptionsExportEngineExtension.php
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	<?php

	final class PhabricatorSubscriptionsExportEngineExtension
	extends PhabricatorExportEngineExtension {

	const EXTENSIONKEY = 'subscriptions';

	public function supportsObject($object) {
	return ($object instanceof PhabricatorSubscribableInterface);
	}

	public function newExportFields() {
	return array(
	id(new PhabricatorPHIDListExportField())
	->setKey('subscriberPHIDs')
	->setLabel(pht('Subscriber PHIDs')),
	id(new PhabricatorStringListExportField())
	->setKey('subscribers')
	->setLabel(pht('Subscribers')),
	);
	}

	public function newExportData(array $objects) {
	$viewer = $this->getViewer();

	$object_phids = mpull($objects, 'getPHID');

	$projects_query = id(new PhabricatorEdgeQuery())
	->withSourcePHIDs($object_phids)
	->withEdgeTypes(
	array(
	PhabricatorObjectHasSubscriberEdgeType::EDGECONST,
	));
	$projects_query->execute();

	$handles = $viewer->loadHandles($projects_query->getDestinationPHIDs());

	$map = array();
	foreach ($objects as $object) {
	$object_phid = $object->getPHID();

	$project_phids = $projects_query->getDestinationPHIDs(
	array($object_phid),
	array(PhabricatorObjectHasSubscriberEdgeType::EDGECONST));

	$handle_list = $handles->newSublist($project_phids);
	$handle_list = iterator_to_array($handle_list);
	$handle_names = mpull($handle_list, 'getName');
	$handle_names = array_values($handle_names);

	$map[] = array(
	'subscriberPHIDs' => $project_phids,
	'subscribers' => $handle_names,
	);
	}

	return $map;
	}

	}