NuanceItemType.php
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	<?php

	abstract class NuanceItemType
	extends Phobject {

	private $viewer;
	private $controller;

	public function setViewer(PhabricatorUser $viewer) {
	$this->viewer = $viewer;
	return $this;
	}

	public function getViewer() {
	return $this->viewer;
	}

	public function setController(PhabricatorController $controller) {
	$this->controller = $controller;
	return $this;
	}

	public function getController() {
	return $this->controller;
	}

	public function canUpdateItems() {
	return false;
	}

	final public function buildItemView(NuanceItem $item) {
	return $this->newItemView($item);
	}

	protected function newItemView(NuanceItem $item) {
	return null;
	}

	public function getItemTypeDisplayIcon() {
	return null;
	}

	public function getItemActions(NuanceItem $item) {
	return array();
	}

	public function getItemCurtainPanels(NuanceItem $item) {
	return array();
	}

	abstract public function getItemTypeDisplayName();
	abstract public function getItemDisplayName(NuanceItem $item);

	final public function updateItem(NuanceItem $item) {
	if (!$this->canUpdateItems()) {
	throw new Exception(
	pht(
	'This item type ("%s", of class "%s") can not update items.',
	$this->getItemTypeConstant(),
	get_class($this)));
	}

	$this->updateItemFromSource($item);
	}

	protected function updateItemFromSource(NuanceItem $item) {
	throw new PhutilMethodNotImplementedException();
	}

	final public function getItemTypeConstant() {
	return $this->getPhobjectClassConstant('ITEMTYPE', 64);
	}

	final public static function getAllItemTypes() {
	return id(new PhutilClassMapQuery())
	->setAncestorClass(__CLASS__)
	->setUniqueMethod('getItemTypeConstant')
	->execute();
	}

	final protected function newItemAction(NuanceItem $item, $key) {
	$id = $item->getID();
	$action_uri = "/nuance/item/action/{$id}/{$key}/";

	return id(new PhabricatorActionView())
	->setHref($action_uri);
	}

	final protected function newCurtainPanel(NuanceItem $item) {
	return id(new PHUICurtainPanelView());
	}

	final public function buildActionResponse(NuanceItem $item, $action) {
	$response = $this->handleAction($item, $action);

	if ($response === null) {
	return new Aphront404Response();
	}

	return $response;
	}

	protected function handleAction(NuanceItem $item, $action) {
	return null;
	}

	final public function applyCommand(
	NuanceItem $item,
	NuanceItemCommand $command) {

	$result = $this->handleCommand($item, $command);

	if ($result === null) {
	return;
	}

	$xaction = id(new NuanceItemTransaction())
	->setTransactionType(NuanceItemTransaction::TYPE_COMMAND)
	->setNewValue(
	array(
	'command' => $command->getCommand(),
	'parameters' => $command->getParameters(),
	'result' => $result,
	));

	$viewer = $this->getViewer();

	// TODO: Maybe preserve the actor's original content source?
	$source = PhabricatorContentSource::newForSource(
	PhabricatorDaemonContentSource::SOURCECONST);

	$editor = id(new NuanceItemEditor())
	->setActor($viewer)
	->setActingAsPHID($command->getAuthorPHID())
	->setContentSource($source)
	->setContinueOnMissingFields(true)
	->setContinueOnNoEffect(true)
	->applyTransactions($item, array($xaction));
	}

	protected function handleCommand(
	NuanceItem $item,
	NuanceItemCommand $command) {
	return null;
	}

	final protected function newContentSource(
	NuanceItem $item,
	$agent_phid) {
	return PhabricatorContentSource::newForSource(
	NuanceContentSource::SOURCECONST,
	array(
	'itemPHID' => $item->getPHID(),
	'agentPHID' => $agent_phid,
	));
	}

	protected function getActingAsPHID(NuanceItem $item) {
	return id(new PhabricatorNuanceApplication())->getPHID();
	}

	}

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