DifferentialLandingStrategy.php
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	<?php

	abstract class DifferentialLandingStrategy {

	public abstract function processLandRequest(
	AphrontRequest $request,
	DifferentialRevision $revision,
	PhabricatorRepository $repository);

	/**
	* returns PhabricatorActionView or an array of PhabricatorActionView or null.
	*/
	abstract function createMenuItems(
	PhabricatorUser $viewer,
	DifferentialRevision $revision,
	PhabricatorRepository $repository);

	/**
	* returns PhabricatorActionView which can be attached to the revision view.
	*/
	protected function createActionView($revision, $name, $disabled = false) {
	$strategy = get_class($this);
	$revision_id = $revision->getId();
	return id(new PhabricatorActionView())
	->setRenderAsForm(true)
	->setName($name)
	->setHref("/differential/revision/land/{$revision_id}/{$strategy}/")
	->setDisabled($disabled);
	}

	/**
	* might break if repository is not Git.
	*/
	protected function getGitWorkspace(PhabricatorRepository $repository) {
	try {
	return DifferentialGetWorkingCopy::getCleanGitWorkspace($repository);
	} catch (Exception $e) {
	throw new PhutilProxyException(
	'Failed to allocate a workspace',
	$e);
	}
	}

	/**
	* might break if repository is not Mercurial.
	*/
	protected function getMercurialWorkspace(PhabricatorRepository $repository) {
	try {
	return DifferentialGetWorkingCopy::getCleanMercurialWorkspace(
	$repository);
	} catch (Exception $e) {
	throw new PhutilProxyException(
	'Failed to allocate a workspace',
	$e);
	}
	}
	}