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PhabricatorCalendarImportFrequencyTransaction.php
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			<?php

			final class PhabricatorCalendarImportFrequencyTransaction
			extends PhabricatorCalendarImportTransactionType {

			const TRANSACTIONTYPE = 'calendar.import.frequency';

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

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

			public function getTitle() {
			return pht(
			'%s changed the automatic update frequency for this import.',
			$this->renderAuthor());
			}

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

			$frequency_map = PhabricatorCalendarImport::getTriggerFrequencyMap();
			$valid = array_keys($frequency_map);
			$valid = array_fuse($valid);

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

			if (!isset($valid[$value])) {
			$errors[] = $this->newInvalidError(
			pht(
			'Import frequency "%s" is not valid. Valid frequencies are: %s.',
			$value,
			implode(', ', $valid)),
			$xaction);
			}
			}

			return $errors;
			}

			}