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PhabricatorRepositoryVCSTransaction.php
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			<?php

			final class PhabricatorRepositoryVCSTransaction
			extends PhabricatorRepositoryTransactionType {

			const TRANSACTIONTYPE = 'repo:vcs';

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

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

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

			$vcs_map = PhabricatorRepositoryType::getAllRepositoryTypes();
			$current_vcs = $object->getVersionControlSystem();

			if (!$this->isNewObject()) {
			foreach ($xactions as $xaction) {
			if ($xaction->getNewValue() == $current_vcs) {
			continue;
			}

			$errors[] = $this->newInvalidError(
			pht(
			'You can not change the version control system an existing '.
			'repository uses. It can only be set when a repository is '.
			'first created.'),
			$xaction);
			}

			return $errors;
			}

			$value = $object->getVersionControlSystem();

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

			if (isset($vcs_map[$value])) {
			continue;
			}

			$errors[] = $this->newInvalidError(
			pht(
			'Specified version control system must be a VCS '.
			'recognized by this software. Valid systems are: %s.',
			implode(', ', array_keys($vcs_map))),
			$xaction);
			}

			if ($value === null) {
			$errors[] = $this->newRequiredError(
			pht(
			'When creating a repository, you must specify a valid '.
			'underlying version control system. Valid systems are: %s.',
			implode(', ', array_keys($vcs_map))));
			}

			return $errors;
			}
			}