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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');
			if (!$object_phids) {
			return array();
			}

			$projects_query = id(new PhabricatorEdgeQuery())
			->withSourcePHIDs($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;
			}

			}