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;
	}

	}