testing

DiffusionHistoryQuery.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 DiffusionHistoryQuery {

			private $request;

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

			final public static function newFromDiffusionRequest(
			DiffusionRequest $request) {

			$repository = $request->getRepository();

			switch ($repository->getVersionControlSystem()) {
			case 'git':
			$class = 'DiffusionGitHistoryQuery';
			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 loadHistory() {
			return $this->executeQuery();
			}

			abstract protected function executeQuery();
			}