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PhabricatorEditEngineQuery.php
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			<?php

			final class PhabricatorEditEngineQuery
			extends PhabricatorCursorPagedPolicyAwareQuery {

			private $engineKeys;

			public function withEngineKeys(array $keys) {
			$this->engineKeys = $keys;
			return $this;
			}

			protected function loadPage() {
			$engines = PhabricatorEditEngine::getAllEditEngines();

			if ($this->engineKeys !== null) {
			$engines = array_select_keys($engines, $this->engineKeys);
			}

			return $engines;
			}

			protected function willFilterPage(array $engines) {
			$viewer = $this->getViewer();

			foreach ($engines as $key => $engine) {
			$app_class = $engine->getEngineApplicationClass();
			if ($app_class === null) {
			continue;
			}

			$can_see = PhabricatorApplication::isClassInstalledForViewer(
			$app_class,
			$viewer);
			if (!$can_see) {
			$this->didRejectResult($engine);
			unset($engines[$key]);
			continue;
			}
			}

			return $engines;
			}

			public function getQueryApplicationClass() {
			return PhabricatorTransactionsApplication::class;
			}

			}