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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;
			}

			}