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 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;
	}

	}