PhrictionDocumentPublishTransaction.php
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	<?php

	final class PhrictionDocumentPublishTransaction
	extends PhrictionDocumentTransactionType {

	const TRANSACTIONTYPE = 'publish';

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

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

	public function getActionName() {
	return pht('Published');
	}

	public function getTitle() {
	return pht(
	'%s published a new version of this document.',
	$this->renderAuthor());
	}

	public function getTitleForFeed() {
	return pht(
	'%s published a new version of %s.',
	$this->renderAuthor(),
	$this->renderObject());
	}

	public function validateTransactions($object, array $xactions) {
	$actor = $this->getActor();
	$errors = array();

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

	// If this isn't changing anything, skip it.
	if ($content_phid === $object->getContentPHID()) {
	continue;
	}

	$content = id(new PhrictionContentQuery())
	->setViewer($actor)
	->withPHIDs(array($content_phid))
	->executeOne();
	if (!$content) {
	$errors[] = $this->newInvalidError(
	pht(
	'Unable to load Content object with PHID "%s".',
	$content_phid),
	$xaction);
	continue;
	}

	if ($content->getDocumentPHID() !== $object->getPHID()) {
	$errors[] = $this->newInvalidError(
	pht(
	'Content object "%s" can not be published because it belongs '.
	'to a different document.',
	$content_phid));
	continue;
	}
	}

	return $errors;
	}

	}