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PhabricatorCalendarExportModeTransaction.php
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			<?php

			final class PhabricatorCalendarExportModeTransaction
			extends PhabricatorCalendarExportTransactionType {

			const TRANSACTIONTYPE = 'calendar.export.mode';

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

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

			public function getTitle() {
			$old_value = $this->getOldValue();
			$new_value = $this->getNewValue();

			$old_name = PhabricatorCalendarExport::getPolicyModeName($old_value);
			$new_name = PhabricatorCalendarExport::getPolicyModeName($new_value);

			return pht(
			'%s changed the policy mode for this export from %s to %s.',
			$this->renderAuthor(),
			$this->renderValue($old_name),
			$this->renderValue($new_name));
			}

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

			$valid = PhabricatorCalendarExport::getPolicyModes();
			$valid = array_fuse($valid);

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

			if (isset($valid[$value])) {
			continue;
			}

			$errors[] = $this->newInvalidError(
			pht(
			'Mode "%s" is not a valid policy mode. Valid modes are: %s.',
			$value,
			implode(', ', $valid)),
			$xaction);
			}

			return $errors;
			}

			}