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PhabricatorSubscriptionsSearchEngineExtension.php
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			<?php

			final class PhabricatorSubscriptionsSearchEngineExtension
			extends PhabricatorSearchEngineExtension {

			const EXTENSIONKEY = 'subscriptions';

			public function isExtensionEnabled() {
			return PhabricatorApplication::isClassInstalled(
			'PhabricatorSubscriptionsApplication');
			}

			public function getExtensionName() {
			return pht('Support for Subscriptions');
			}

			public function getExtensionOrder() {
			return 2000;
			}

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

			public function applyConstraintsToQuery(
			$object,
			$query,
			PhabricatorSavedQuery $saved,
			array $map) {

			if (!empty($map['subscriberPHIDs'])) {
			$query->withEdgeLogicPHIDs(
			PhabricatorObjectHasSubscriberEdgeType::EDGECONST,
			PhabricatorQueryConstraint::OPERATOR_OR,
			$map['subscriberPHIDs']);
			}
			}

			public function getSearchFields($object) {
			$fields = array();

			$fields[] = id(new PhabricatorSearchSubscribersField())
			->setLabel(pht('Subscribers'))
			->setKey('subscriberPHIDs')
			->setConduitKey('subscribers')
			->setAliases(array('subscriber', 'subscribers'))
			->setDescription(
			pht('Search for objects with certain subscribers.'));

			return $fields;
			}

			public function getSearchAttachments($object) {
			return array(
			id(new PhabricatorSubscriptionsSearchEngineAttachment())
			->setAttachmentKey('subscribers'),
			);
			}

			}