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PhabricatorCalendarExportQueryKeyTransaction.php
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			<?php

			final class PhabricatorCalendarExportQueryKeyTransaction
			extends PhabricatorCalendarExportTransactionType {

			const TRANSACTIONTYPE = 'calendar.export.querykey';

			public function generateOldValue($object) {
			return $object->getQueryKey();
			}

			public function applyInternalEffects($object, $value) {
			$object->setQueryKey($value);
			}

			public function getTitle() {
			return pht(
			'%s changed the query for this export.',
			$this->renderAuthor());
			}

			public function validateTransactions($object, array $xactions) {
			$actor = $this->getActor();

			$errors = array();

			foreach ($xactions as $xaction) {
			$value = $xaction->getNewValue();

			$query = id(new PhabricatorSavedQueryQuery())
			->setViewer($actor)
			->withEngineClassNames(array('PhabricatorCalendarEventSearchEngine'))
			->withQueryKeys(array($value))
			->executeOne();
			if ($query) {
			continue;
			}

			$builtin = id(new PhabricatorCalendarEventSearchEngine())
			->setViewer($actor)
			->getBuiltinQueries($actor);
			if (isset($builtin[$value])) {
			continue;
			}

			$errors[] = $this->newInvalidError(
			pht(
			'Query key "%s" does not identify a valid event query.',
			$value),
			$xaction);
			}

			if ($this->isEmptyTextTransaction($object->getQueryKey(), $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('Calendar exports must have a query key.'));
			}

			return $errors;
			}

			}