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PhabricatorDashboardQueryPanelApplicationTransaction.php
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			<?php

			final class PhabricatorDashboardQueryPanelApplicationTransaction
			extends PhabricatorDashboardPanelPropertyTransaction {

			const TRANSACTIONTYPE = 'query.application';

			protected function getPropertyKey() {
			return 'class';
			}

			public function validateTransactions($object, array $xactions) {
			$errors = array();

			$engines = PhabricatorApplicationSearchEngine::getAllEngines();

			$old_value = $object->getProperty($this->getPropertyKey());
			foreach ($xactions as $xaction) {
			$new_value = $xaction->getNewValue();

			if ($new_value === $old_value) {
			continue;
			}

			if (!isset($engines[$new_value])) {
			$errors[] = $this->newInvalidError(
			pht(
			'Application search engine class "%s" is unknown. Query panels '.
			'must use a known search engine class.',
			$new_value),
			$xaction);
			continue;
			}
			}

			return $errors;
			}

			}