PhabricatorEditEngineExtension.php
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	<?php

	abstract class PhabricatorEditEngineExtension extends Phobject {

	private $viewer;

	final public function getExtensionKey() {
	return $this->getPhobjectClassConstant('EXTENSIONKEY');
	}

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

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

	public function getExtensionPriority() {
	return 1000;
	}

	abstract public function isExtensionEnabled();
	abstract public function getExtensionName();

	abstract public function supportsObject(
	PhabricatorEditEngine $engine,
	PhabricatorApplicationTransactionInterface $object);

	abstract public function buildCustomEditFields(
	PhabricatorEditEngine $engine,
	PhabricatorApplicationTransactionInterface $object);

	public function didBuildCustomEditFields(
	PhabricatorEditEngine $engine,
	PhabricatorApplicationTransactionInterface $object,
	array $fields) {
	return;
	}

	final public static function getAllExtensions() {
	return id(new PhutilClassMapQuery())
	->setAncestorClass(__CLASS__)
	->setUniqueMethod('getExtensionKey')
	->setSortMethod('getExtensionPriority')
	->execute();
	}

	final public static function getAllEnabledExtensions() {
	$extensions = self::getAllExtensions();

	foreach ($extensions as $key => $extension) {
	if (!$extension->isExtensionEnabled()) {
	unset($extensions[$key]);
	}
	}

	return $extensions;
	}

	}