PholioImageSequenceTransaction.php
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	<?php

	final class PholioImageSequenceTransaction
	extends PholioImageTransactionType {

	const TRANSACTIONTYPE = 'image-sequence';

	public function generateOldValue($object) {
	$sequence = null;
	$phid = null;
	$image = $this->getImageForXaction($object);
	if ($image) {
	$sequence = $image->getSequence();
	$phid = $image->getPHID();
	}
	return array($phid => $sequence);
	}

	public function applyInternalEffects($object, $value) {
	$image = $this->getImageForXaction($object);
	$value = (int)head($this->getNewValue());
	$image->setSequence($value);
	$image->save();
	}

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

	return pht(
	'%s updated an image\'s (%s) sequence.',
	$this->renderAuthor(),
	$this->renderHandleLink(key($new)));
	}

	public function getTitleForFeed() {
	return pht(
	'%s updated image sequence of %s.',
	$this->renderAuthor(),
	$this->renderObject());
	}

	public function shouldHide() {
	// this is boring / silly to surface; changing sequence is NBD
	return true;
	}

	public function mergeTransactions(
	$object,
	PhabricatorApplicationTransaction $u,
	PhabricatorApplicationTransaction $v) {
	$raw_new_value_u = $u->getNewValue();
	$raw_new_value_v = $v->getNewValue();
	$phid_u = key($raw_new_value_u);
	$phid_v = key($raw_new_value_v);
	if ($phid_u == $phid_v) {
	return $v;
	}
	}

	}