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PhabricatorSpacesNamespaceDefaultTransaction.php
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			<?php

			final class PhabricatorSpacesNamespaceDefaultTransaction
			extends PhabricatorSpacesNamespaceTransactionType {

			const TRANSACTIONTYPE = 'spaces:default';

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

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

			public function getTitle() {
			return pht(
			'%s made this the default space.',
			$this->renderAuthor());
			}

			public function getTitleForFeed() {
			return pht(
			'%s made space %s the default space.',
			$this->renderAuthor(),
			$this->renderObject());

			}

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

			if (!$this->isNewObject()) {
			foreach ($xactions as $xaction) {
			$errors[] = $this->newInvalidError(
			pht('Only the first space created can be the default space, and '.
			'it must remain the default space evermore.'));
			}
			}

			return $errors;
			}

			}