DifferentialRevisionTitleTransaction.php
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	<?php

	final class DifferentialRevisionTitleTransaction
	extends DifferentialRevisionTransactionType {

	const TRANSACTIONTYPE = 'differential.revision.title';
	const EDITKEY = 'title';

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

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

	public function getTitle() {
	return pht(
	'%s retitled this revision from %s to %s.',
	$this->renderAuthor(),
	$this->renderOldValue(),
	$this->renderNewValue());
	}

	public function getTitleForFeed() {
	return pht(
	'%s retitled %s from %s to %s.',
	$this->renderAuthor(),
	$this->renderObject(),
	$this->renderOldValue(),
	$this->renderNewValue());
	}

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

	if ($this->isEmptyTextTransaction($object->getTitle(), $xactions)) {
	$errors[] = $this->newRequiredError(
	pht('Revisions must have a title.'));
	}

	$max_length = $object->getColumnMaximumByteLength('title');
	foreach ($xactions as $xaction) {
	$new_value = $xaction->getNewValue();
	$new_length = strlen($new_value);
	if ($new_length > $max_length) {
	$errors[] = $this->newInvalidError(
	pht(
	'Revision title is too long: the maximum length of a '.
	'revision title is 255 bytes.'),
	$xaction);
	}
	}

	return $errors;
	}

	}