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AlmanacInterfacePortTransaction.php
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			<?php

			final class AlmanacInterfacePortTransaction
			extends AlmanacInterfaceTransactionType {

			const TRANSACTIONTYPE = 'almanac:interface:port';

			public function generateOldValue($object) {
			$port = $object->getPort();

			if ($port !== null) {
			$port = (int)$port;
			}

			return $port;
			}

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

			public function getTitle() {
			return pht(
			'%s changed the port 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->getPort(), $xactions)) {
			$errors[] = $this->newRequiredError(
			pht('Interfaces must have a port number.'));
			}

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

			$port = (int)$port;
			if ($port < 1 \|\| $port > 65535) {
			$errors[] = $this->newInvalidError(
			pht('Port numbers must be between 1 and 65535, inclusive.'),
			$xaction);
			continue;
			}
			}

			return $errors;
			}

			}