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PhabricatorRepositorySymbolSourcesTransaction.php
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			<?php

			final class PhabricatorRepositorySymbolSourcesTransaction
			extends PhabricatorRepositoryTransactionType {

			const TRANSACTIONTYPE = 'repo:symbol-source';

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

			public function applyInternalEffects($object, $value) {
			$object->setDetail('symbol-sources', $value);
			}

			public function getTitle() {
			$old = $this->getOldValue();
			$new = $this->getNewValue();

			if ($old) {
			$display_old = $this->renderHandleList($old);
			} else {
			$display_old = $this->renderValue(pht('None'));
			}

			if ($new) {
			$display_new = $this->renderHandleList($new);
			} else {
			$display_new = $this->renderValue(pht('None'));
			}

			return pht(
			'%s changed symbol sources from %s to %s.',
			$this->renderAuthor(),
			$display_old,
			$display_new);
			}

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

			foreach ($xactions as $xaction) {
			$old = $object->getSymbolSources();
			$new = $xaction->getNewValue();

			// If the viewer is adding new repositories, make sure they are
			// valid and visible.
			$add = array_diff($new, $old);
			if (!$add) {
			continue;
			}

			$repositories = id(new PhabricatorRepositoryQuery())
			->setViewer($this->getActor())
			->withPHIDs($add)
			->execute();
			$repositories = mpull($repositories, null, 'getPHID');

			foreach ($add as $phid) {
			if (isset($repositories[$phid])) {
			continue;
			}

			$errors[] = $this->newInvalidError(
			pht(
			'Repository ("%s") does not exist, or you do not have '.
			'permission to see it.',
			$phid),
			$xaction);
			break;
			}
			}

			return $errors;
			}


			}