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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(),
			$this->renderHandle(head_key($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;
			}
			}

			}