AlmanacInterfaceNetworkTransaction.php
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	<?php

	final class AlmanacInterfaceNetworkTransaction
	extends AlmanacInterfaceTransactionType {

	const TRANSACTIONTYPE = 'almanac:interface:network';

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

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

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

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

	$network_phid = $object->getNetworkPHID();
	if ($this->isEmptyTextTransaction($network_phid, $xactions)) {
	$errors[] = $this->newRequiredError(
	pht('Interfaces must have a network.'));
	}

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

	$networks = id(new AlmanacNetworkQuery())
	->setViewer($this->getActor())
	->withPHIDs(array($network_phid))
	->execute();
	if (!$networks) {
	$errors[] = $this->newInvalidError(
	pht(
	'You can not put an interface on a nonexistent or restricted '.
	'network.'),
	$xaction);
	continue;
	}
	}

	return $errors;
	}

	}