PhamePostSubtitleTransaction.php
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	<?php

	final class PhamePostSubtitleTransaction
	extends PhamePostTransactionType {

	const TRANSACTIONTYPE = 'phame.post.subtitle';

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

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

	public function getTitle() {
	$old = $this->getOldValue();
	if ($old === null) {
	return pht(
	'%s set this post\'s subtitle to "%s".',
	$this->renderAuthor(),
	$this->renderNewValue());
	} else {
	return pht(
	'%s updated the post\'s subtitle to "%s".',
	$this->renderAuthor(),
	$this->renderNewValue());
	}
	}

	public function getTitleForFeed() {
	$old = $this->getOldValue();
	if ($old === null) {
	return pht(
	'%s set the subtitle for %s.',
	$this->renderAuthor(),
	$this->renderObject());
	} else {
	return pht(
	'%s updated the subtitle for %s.',
	$this->renderAuthor(),
	$this->renderObject());
	}
	}

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

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

	return $errors;
	}

	}