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;
	}

	}