PhabricatorFileTransform.php
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	<?php

	abstract class PhabricatorFileTransform extends Phobject {

	abstract public function getTransformName();
	abstract public function getTransformKey();
	abstract public function canApplyTransform(PhabricatorFile $file);
	abstract public function applyTransform(PhabricatorFile $file);

	public function getDefaultTransform(PhabricatorFile $file) {
	return null;
	}

	public function generateTransforms() {
	return array($this);
	}

	public function executeTransform(PhabricatorFile $file) {
	if ($this->canApplyTransform($file)) {
	try {
	return $this->applyTransform($file);
	} catch (Exception $ex) {
	// Ignore.
	}
	}

	return $this->getDefaultTransform($file);
	}

	public static function getAllTransforms() {
	static $map;

	if ($map === null) {
	$xforms = id(new PhutilSymbolLoader())
	->setAncestorClass(__CLASS__)
	->loadObjects();

	$result = array();
	foreach ($xforms as $xform_template) {
	foreach ($xform_template->generateTransforms() as $xform) {
	$key = $xform->getTransformKey();
	if (isset($result[$key])) {
	throw new Exception(
	pht(
	'Two %s objects define the same transform key ("%s"), but '.
	'each transform must have a unique key.',
	__CLASS__,
	$key));
	}
	$result[$key] = $xform;
	}
	}

	$map = $result;
	}

	return $map;
	}

	public static function getTransformByKey($key) {
	$all = self::getAllTransforms();

	$xform = idx($all, $key);
	if (!$xform) {
	throw new Exception(
	pht(
	'No file transform with key "%s" exists.',
	$key));
	}

	return $xform;
	}

	}