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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($value) {
			if (!phutil_nonempty_string($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;
			}

			}