DiffusionLastModifiedQuery.php
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	<?php

	/*
	* Copyright 2011 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	abstract class DiffusionLastModifiedQuery {

	private $request;

	final private function __construct() {
	// <private>
	}

	final public static function newFromDiffusionRequest(
	DiffusionRequest $request) {

	$repository = $request->getRepository();

	switch ($repository->getVersionControlSystem()) {
	case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
	$class = 'DiffusionGitLastModifiedQuery';
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	$class = 'DiffusionSvnLastModifiedQuery';
	break;
	default:
	throw new Exception("Unsupported VCS!");
	}

	PhutilSymbolLoader::loadClass($class);
	$query = new $class();

	$query->request = $request;

	return $query;
	}

	final protected function getRequest() {
	return $this->request;
	}

	final public function loadLastModification() {
	return $this->executeQuery();
	}

	abstract protected function executeQuery();

	}