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;
	}

	}