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PonderAnswerHistoryController.php
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			<?php

			final class PonderAnswerHistoryController extends PonderController {

			public function shouldAllowPublic() {
			return true;
			}

			public function handleRequest(AphrontRequest $request) {
			$viewer = $request->getViewer();
			$id = $request->getURIData('id');

			$answer = id(new PonderAnswerQuery())
			->setViewer($viewer)
			->withIDs(array($id))
			->executeOne();
			if (!$answer) {
			return new Aphront404Response();
			}

			$timeline = $this->buildTransactionTimeline(
			$answer,
			new PonderAnswerTransactionQuery());
			$timeline->setShouldTerminate(true);

			$qid = $answer->getQuestion()->getID();
			$aid = $answer->getID();

			$crumbs = $this->buildApplicationCrumbs();
			$crumbs->setBorder(true);
			$crumbs->addTextCrumb("Q{$qid}", "/Q{$qid}");
			$crumbs->addTextCrumb("A{$aid}", "/Q{$qid}#{$aid}");
			$crumbs->addTextCrumb(pht('History'));
			$crumbs->setBorder(true);

			$header = id(new PHUIHeaderView())
			->setHeader(pht('Answer History'))
			->setHeaderIcon('fa-history');

			$view = id(new PHUITwoColumnView())
			->setHeader($header)
			->setFooter($timeline);

			return $this->newPage()
			->setTitle(pht('Answer History'))
			->setCrumbs($crumbs)
			->appendChild($view);
			}

			}