AlmanacInterfaceAddressTransaction.php
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	<?php

	final class AlmanacInterfaceAddressTransaction
	extends AlmanacInterfaceTransactionType {

	const TRANSACTIONTYPE = 'almanac:interface:address';

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

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

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

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

	if ($this->isEmptyTextTransaction($object->getAddress(), $xactions)) {
	$errors[] = $this->newRequiredError(
	pht('Interfaces must have an address.'));
	}

	foreach ($xactions as $xaction) {

	// NOTE: For now, we don't validate addresses. We generally expect users
	// to provide IPv4 addresses, but it's reasonable for them to provide
	// IPv6 addresses, and some installs currently use DNS names. This is
	// off-label but works today.

	}

	return $errors;
	}

	}