PhabricatorExportFormat.php
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	<?php

	abstract class PhabricatorExportFormat
	extends Phobject {

	private $viewer;

	final public function getExportFormatKey() {
	return $this->getPhobjectClassConstant('EXPORTKEY');
	}

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

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

	abstract public function getExportFormatName();
	abstract public function getMIMEContentType();
	abstract public function getFileExtension();

	abstract public function addObject($object, array $fields, array $map);
	abstract public function newFileData();

	public function isExportFormatEnabled() {
	return true;
	}

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

	final public static function getAllEnabledExportFormats() {
	$formats = self::getAllExportFormats();

	foreach ($formats as $key => $format) {
	if (!$format->isExportFormatEnabled()) {
	unset($formats[$key]);
	}
	}

	return $formats;
	}

	}