PhabricatorPasteLanguageTransaction.php
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	<?php

	final class PhabricatorPasteLanguageTransaction
	extends PhabricatorPasteTransactionType {

	const TRANSACTIONTYPE = 'paste.language';

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

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

	private function renderLanguageValue($value) {
	if (!strlen($value)) {
	return $this->renderValue(pht('autodetect'));
	} else {
	return $this->renderValue($value);
	}
	}

	public function getTitle() {
	return pht(
	"%s updated the paste's language from %s to %s.",
	$this->renderAuthor(),
	$this->renderLanguageValue($this->getOldValue()),
	$this->renderLanguageValue($this->getNewValue()));
	}

	public function getTitleForFeed() {
	return pht(
	'%s updated the language for %s from %s to %s.',
	$this->renderAuthor(),
	$this->renderObject(),
	$this->renderLanguageValue($this->getOldValue()),
	$this->renderLanguageValue($this->getNewValue()));
	}

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

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

	if ($new !== null && !strlen($new)) {
	$errors[] = $this->newInvalidError(
	pht('Paste language must be null or a nonempty string.'),
	$xaction);
	}
	}

	return $errors;
	}

	}