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AlmanacInterfaceDestroyTransaction.php
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			<?php

			final class AlmanacInterfaceDestroyTransaction
			extends AlmanacInterfaceTransactionType {

			const TRANSACTIONTYPE = 'almanac:interface:destroy';

			public function generateOldValue($object) {
			return false;
			}

			public function applyExternalEffects($object, $value) {
			id(new PhabricatorDestructionEngine())
			->destroyObject($object);
			}

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

			if ($xactions) {
			if ($object->loadIsInUse()) {
			$errors[] = $this->newInvalidError(
			pht(
			'You can not delete this interface because it is currently in '.
			'use. One or more services are bound to it.'));
			}
			}

			return $errors;
			}

			}