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PhabricatorProjectColumnLimitTransaction.php
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			<?php

			final class PhabricatorProjectColumnLimitTransaction
			extends PhabricatorProjectColumnTransactionType {

			const TRANSACTIONTYPE = 'project:col:limit';

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

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

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

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

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

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

			foreach ($xactions as $xaction) {
			$value = $xaction->getNewValue();
			if (strlen($value) && !preg_match('/^\d+\z/', $value)) {
			$errors[] = $this->newInvalidError(
			pht(
			'Column point limit must either be empty or a nonnegative '.
			'integer.'),
			$xaction);
			}
			}

			return $errors;
			}

			}