ConpherenceThreadTopicTransaction.php
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ConpherenceThreadTopicTransaction.php
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			<?php

			final class ConpherenceThreadTopicTransaction
			extends ConpherenceThreadTransactionType {

			const TRANSACTIONTYPE = 'topic';

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

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

			public function getTitle() {
			$old = $this->getOldValue();
			$new = $this->getNewValue();

			if (strlen($new)) {
			return pht(
			'%s set the room topic to %s.',
			$this->renderAuthor(),
			$this->renderNewValue());
			} else {
			return pht(
			'%s removed the room topic.',
			$this->renderAuthor());
			}

			}

			public function getTitleForFeed() {
			$old = $this->getOldValue();
			$new = $this->getNewValue();

			if (strlen($new)) {
			return pht(
			'%s set the room topic to %s in %s.',
			$this->renderAuthor(),
			$this->renderNewValue(),
			$this->renderObject());
			} else {
			return pht(
			'%s removed the room topic for %s.',
			$this->renderAuthor(),
			$this->renderObject());
			}

			}

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

			$max_length = $object->getColumnMaximumByteLength('topic');
			foreach ($xactions as $xaction) {
			$new_value = $xaction->getNewValue();
			$new_length = strlen($new_value);
			if ($new_length > $max_length) {
			$errors[] = $this->newInvalidError(
			pht('The topic can be no longer than %s characters.',
			new PhutilNumber($max_length)));
			}
			}

			return $errors;
			}

			}