PhabricatorDestructibleCodex.php
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	<?php

	abstract class PhabricatorDestructibleCodex
	extends Phobject {

	private $viewer;
	private $object;

	public function getDestructionNotes() {
	return array();
	}

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

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

	final public function setObject(
	PhabricatorDestructibleCodexInterface $object) {
	$this->object = $object;
	return $this;
	}

	final public function getObject() {
	return $this->object;
	}

	final public static function newFromObject(
	PhabricatorDestructibleCodexInterface $object,
	PhabricatorUser $viewer) {

	if (!($object instanceof PhabricatorDestructibleInterface)) {
	throw new Exception(
	pht(
	'Object (of class "%s") implements interface "%s", but must also '.
	'implement interface "%s".',
	get_class($object),
	'PhabricatorDestructibleCodexInterface',
	'PhabricatorDestructibleInterface'));
	}

	$codex = $object->newDestructibleCodex();
	if (!($codex instanceof PhabricatorDestructibleCodex)) {
	throw new Exception(
	pht(
	'Object (of class "%s") implements interface "%s", but defines '.
	'method "%s" incorrectly: this method must return an object of '.
	'class "%s".',
	get_class($object),
	'PhabricatorDestructibleCodexInterface',
	'newDestructibleCodex()',
	__CLASS__));
	}

	$codex
	->setObject($object)
	->setViewer($viewer);

	return $codex;
	}

	}