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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;
			}

			}