DifferentialRevisionVoidTransaction.php
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	<?php

	/**
	* This is an internal transaction type used to void reviews.
	*
	* For example, "Request Review" voids any open accepts, so they no longer
	* act as current accepts.
	*/
	final class DifferentialRevisionVoidTransaction
	extends DifferentialRevisionTransactionType {

	const TRANSACTIONTYPE = 'differential.revision.void';

	public function generateOldValue($object) {
	return false;
	}

	public function generateNewValue($object, $value) {
	$table = new DifferentialReviewer();
	$table_name = $table->getTableName();
	$conn = $table->establishConnection('w');

	$rows = queryfx_all(
	$conn,
	'SELECT reviewerPHID FROM %T
	WHERE revisionPHID = %s
	AND voidedPHID IS NULL
	AND reviewerStatus IN (%Ls)',
	$table_name,
	$object->getPHID(),
	$value);

	return ipull($rows, 'reviewerPHID');
	}

	public function getTransactionHasEffect($object, $old, $new) {
	return (bool)$new;
	}

	public function applyExternalEffects($object, $value) {
	$table = new DifferentialReviewer();
	$table_name = $table->getTableName();
	$conn = $table->establishConnection('w');

	queryfx(
	$conn,
	'UPDATE %T SET voidedPHID = %s
	WHERE revisionPHID = %s
	AND voidedPHID IS NULL
	AND reviewerPHID IN (%Ls)',
	$table_name,
	$this->getActingAsPHID(),
	$object->getPHID(),
	$value);
	}

	public function shouldHide() {
	// This is an internal transaction, so don't show it in feeds or
	// transaction logs.
	return true;
	}

	private function getVoidableStatuses() {
	return array(
	DifferentialReviewerStatus::STATUS_ACCEPTED,
	DifferentialReviewerStatus::STATUS_REJECTED,
	);
	}

	}