PhabricatorPHIDResolver.php
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	<?php

	/**
	* Resolve a list of identifiers into PHIDs.
	*
	* This class simplifies the process of convering a list of mixed token types
	* (like some PHIDs and some usernames) into a list of just PHIDs.
	*/
	abstract class PhabricatorPHIDResolver extends Phobject {

	private $viewer;

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

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

	final public function resolvePHIDs(array $phids) {
	$type_unknown = PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN;

	$names = array();
	foreach ($phids as $key => $phid) {
	if (phid_get_type($phid) == $type_unknown) {
	$names[$key] = $phid;
	}
	}

	if ($names) {
	$map = $this->getResolutionMap($names);
	foreach ($names as $key => $name) {
	if (isset($map[$name])) {
	$phids[$key] = $map[$name];
	}
	}
	}

	return $phids;
	}

	abstract protected function getResolutionMap(array $names);

	}