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PhabricatorRepositoryTouchLimitTransaction.php
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			<?php

			final class PhabricatorRepositoryTouchLimitTransaction
			extends PhabricatorRepositoryTransactionType {

			const TRANSACTIONTYPE = 'limit.touch';

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

			public function generateNewValue($object, $value) {
			if (!strlen($value)) {
			return null;
			}

			$value = (int)$value;
			if (!$value) {
			return null;
			}

			return $value;
			}

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

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

			if ($old && $new) {
			return pht(
			'%s changed the touch limit for this repository from %s paths to '.
			'%s paths.',
			$this->renderAuthor(),
			$this->renderOldValue(),
			$this->renderNewValue());
			} else if ($new) {
			return pht(
			'%s set the touch limit for this repository to %s paths.',
			$this->renderAuthor(),
			$this->renderNewValue());
			} else {
			return pht(
			'%s removed the touch limit (%s paths) for this repository.',
			$this->renderAuthor(),
			$this->renderOldValue());
			}
			}

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

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

			if (!strlen($new)) {
			continue;
			}

			if (!preg_match('/^\d+\z/', $new)) {
			$errors[] = $this->newInvalidError(
			pht(
			'Unable to parse touch limit, specify a positive number of '.
			'paths.'),
			$xaction);
			continue;
			}
			}

			return $errors;
			}

			}