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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;
			}

			}