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PhabricatorSubscribersQuery.php
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			<?php

			final class PhabricatorSubscribersQuery extends PhabricatorQuery {

			private $objectPHIDs;
			private $subscriberPHIDs;

			public static function loadSubscribersForPHID($phid) {
			if (!$phid) {
			return array();
			}

			$subscribers = id(new PhabricatorSubscribersQuery())
			->withObjectPHIDs(array($phid))
			->execute();
			return $subscribers[$phid];
			}

			public function withObjectPHIDs(array $object_phids) {
			$this->objectPHIDs = $object_phids;
			return $this;
			}

			public function withSubscriberPHIDs(array $subscriber_phids) {
			$this->subscriberPHIDs = $subscriber_phids;
			return $this;
			}

			public function execute() {
			$query = new PhabricatorEdgeQuery();

			$edge_type = PhabricatorObjectHasSubscriberEdgeType::EDGECONST;

			$query->withSourcePHIDs($this->objectPHIDs);
			$query->withEdgeTypes(array($edge_type));

			if ($this->subscriberPHIDs) {
			$query->withDestinationPHIDs($this->subscriberPHIDs);
			}

			$edges = $query->execute();

			$results = array_fill_keys($this->objectPHIDs, array());
			foreach ($edges as $src => $edge_types) {
			foreach ($edge_types[$edge_type] as $dst => $data) {
			$results[$src][] = $dst;
			}
			}

			return $results;
			}
			}