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PhabricatorCalendarEventHostTransaction.php
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			<?php

			final class PhabricatorCalendarEventHostTransaction
			extends PhabricatorCalendarEventTransactionType {

			const TRANSACTIONTYPE = 'calendar.host';

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

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

			public function getTitle() {
			return pht(
			'%s changed the host of this event from %s to %s.',
			$this->renderAuthor(),
			$this->renderOldHandle(),
			$this->renderNewHandle());
			}

			public function getTitleForFeed() {
			return pht(
			'%s changed the host of %s from %s to %s.',
			$this->renderAuthor(),
			$this->renderObject(),
			$this->renderOldHandle(),
			$this->renderNewHandle());
			}

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

			foreach ($xactions as $xaction) {
			$host_phid = $xaction->getNewValue();
			if (!$host_phid) {
			$errors[] = $this->newRequiredError(
			pht('Event host is required.'));
			continue;
			}

			$user = id(new PhabricatorPeopleQuery())
			->setViewer($this->getActor())
			->withPHIDs(array($host_phid))
			->executeOne();
			if (!$user) {
			$errors[] = $this->newInvalidError(
			pht(
			'Host PHID "%s" is not a valid user PHID.',
			$host_phid));
			}
			}

			return $errors;
			}

			}