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PhabricatorCalendarEventRecurringTransaction.php
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			<?php

			final class PhabricatorCalendarEventRecurringTransaction
			extends PhabricatorCalendarEventTransactionType {

			const TRANSACTIONTYPE = 'calendar.recurring';

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

			public function generateNewValue($object, $value) {
			return (int)$value;
			}

			public function isInheritedEdit() {
			return false;
			}

			public function shouldHide() {
			// This event isn't interesting on its own, and is accompanied by an
			// "alice set this event to repeat weekly." event in normal circumstances
			// anyway.
			return true;
			}

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

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

			$old = $object->getIsRecurring();
			foreach ($xactions as $xaction) {
			if ($this->isNewObject()) {
			continue;
			}

			if ($xaction->getNewValue() == $old) {
			continue;
			}

			if ($xaction->getNewValue()) {
			continue;
			}

			$errors[] = $this->newInvalidError(
			pht(
			'An event can not be stopped from recurring once it has been '.
			'made recurring. You can cancel the event.'),
			$xaction);
			}

			return $errors;
			}

			}