testing

PhabricatorSubscriptionsEditEngineExtension.php
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			<?php

			final class PhabricatorSubscriptionsEditEngineExtension
			extends PhabricatorEditEngineExtension {

			const EXTENSIONKEY = 'subscriptions.subscribers';

			public function getExtensionPriority() {
			return 750;
			}

			public function isExtensionEnabled() {
			return true;
			}

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

			public function supportsObject(
			PhabricatorEditEngine $engine,
			PhabricatorApplicationTransactionInterface $object) {
			return ($object instanceof PhabricatorSubscribableInterface);
			}

			public function buildCustomEditFields(
			PhabricatorEditEngine $engine,
			PhabricatorApplicationTransactionInterface $object) {

			$subscribers_type = PhabricatorTransactions::TYPE_SUBSCRIBERS;

			$object_phid = $object->getPHID();
			if ($object_phid) {
			$sub_phids = PhabricatorSubscribersQuery::loadSubscribersForPHID(
			$object_phid);
			} else {
			$sub_phids = array();
			}

			$subscribers_field = id(new PhabricatorSubscribersEditField())
			->setKey('subscriberPHIDs')
			->setLabel(pht('Subscribers'))
			->setEditTypeKey('subscribers')
			->setDescription(pht('Manage subscribers.'))
			->setAliases(array('subscriber', 'subscribers'))
			->setIsCopyable(true)
			->setUseEdgeTransactions(true)
			->setEdgeTransactionDescriptions(
			pht('Add subscribers.'),
			pht('Remove subscribers.'),
			pht('Set subscribers, overwriting current value.'))
			->setCommentActionLabel(pht('Add Subscribers'))
			->setTransactionType($subscribers_type)
			->setValue($sub_phids);

			return array(
			$subscribers_field,
			);
			}

			}