DifferentialBuildableEngine.php
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	<?php

	final class DifferentialBuildableEngine
	extends HarbormasterBuildableEngine {

	protected function getPublishableObject() {
	$object = $this->getObject();

	if ($object instanceof DifferentialDiff) {
	return $object->getRevision();
	}

	return $object;
	}

	public function publishBuildable(
	HarbormasterBuildable $old,
	HarbormasterBuildable $new) {

	// If we're publishing to a diff that is not actually attached to a
	// revision, we have nothing to publish to, so just bail out.
	$revision = $this->getPublishableObject();
	if (!$revision) {
	return;
	}

	// Don't publish manual buildables.
	if ($new->getIsManualBuildable()) {
	return;
	}

	// Don't publish anything if the buildable is still building. Differential
	// treats more buildables as "building" than Harbormaster does, but the
	// Differential definition is a superset of the Harbormaster definition.
	if ($new->isBuilding()) {
	return;
	}

	$viewer = $this->getViewer();

	$old_status = $revision->getBuildableStatus($new->getPHID());
	$new_status = $revision->newBuildableStatus($viewer, $new->getPHID());
	if ($old_status === $new_status) {
	return;
	}

	$buildable_type = DifferentialRevisionBuildableTransaction::TRANSACTIONTYPE;

	$xaction = $this->newTransaction()
	->setMetadataValue('harbormaster:buildablePHID', $new->getPHID())
	->setTransactionType($buildable_type)
	->setNewValue($new_status);

	$this->applyTransactions(array($xaction));
	}

	}