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PhabricatorDashboardQueryPanelLimitTransaction.php
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			<?php

			final class PhabricatorDashboardQueryPanelLimitTransaction
			extends PhabricatorDashboardPanelPropertyTransaction {

			const TRANSACTIONTYPE = 'search.limit';

			protected function getPropertyKey() {
			return 'limit';
			}

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

			return $value;
			}

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

			$old_value = $object->getProperty($this->getPropertyKey());
			foreach ($xactions as $xaction) {
			$new_value = $xaction->getNewValue();

			if ($new_value === $old_value) {
			continue;
			}

			if ($new_value < 0) {
			$errors[] = $this->newInvalidError(
			pht(
			'Query result limit must be empty, or at least 1.'),
			$xaction);
			continue;
			}
			}

			return $errors;
			}

			}