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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_CHROMEOS_VERSION_LOADER_H_
#define CHROME_BROWSER_CHROMEOS_VERSION_LOADER_H_
#pragma once
#include <string>
#include "base/callback.h"
#include "base/gtest_prod_util.h"
#include "chrome/browser/cancelable_request.h"
class FilePath;
namespace chromeos {
// ChromeOSVersionLoader loads the version of Chrome OS from the file system.
// Loading is done asynchronously on the file thread. Once loaded,
// ChromeOSVersionLoader callback to a method of your choice with the version
// (or an empty string if the version couldn't be found).
// To use ChromeOSVersionLoader do the following:
//
// . In your class define a member field of type chromeos::VersionLoader and
// CancelableRequestConsumerBase.
// . Define the callback method, something like:
// void OnGetChromeOSVersion(chromeos::VersionLoader::Handle,
// std::string version);
// . When you want the version invoke: loader.GetVersion(&consumer, callback);
class VersionLoader : public CancelableRequestProvider {
public:
VersionLoader();
enum VersionFormat {
VERSION_SHORT,
VERSION_SHORT_WITH_DATE,
VERSION_FULL,
};
// Signature
typedef Callback2<Handle, std::string>::Type GetVersionCallback;
typedef CancelableRequest<GetVersionCallback> GetVersionRequest;
// Asynchronously requests the version.
// If |full_version| is true version string with extra info is extracted,
// otherwise it's in short format x.x.xx.x.
Handle GetVersion(CancelableRequestConsumerBase* consumer,
GetVersionCallback* callback,
VersionFormat format);
static const char kFullVersionPrefix[];
static const char kVersionPrefix[];
private:
FRIEND_TEST_ALL_PREFIXES(VersionLoaderTest, ParseFullVersion);
FRIEND_TEST_ALL_PREFIXES(VersionLoaderTest, ParseVersion);
// VersionLoader calls into the Backend on the file thread to load
// and extract the version.
class Backend : public base::RefCountedThreadSafe<Backend> {
public:
Backend() {}
// Calls ParseVersion to get the version # and notifies request.
// This is invoked on the file thread.
// If |full_version| is true then extra info is passed in version string.
void GetVersion(scoped_refptr<GetVersionRequest> request,
VersionFormat format);
private:
friend class base::RefCountedThreadSafe<Backend>;
~Backend() {}
DISALLOW_COPY_AND_ASSIGN(Backend);
};
// Extracts the version from the file.
// |prefix| specifies what key defines version data.
static std::string ParseVersion(const std::string& contents,
const std::string& prefix);
scoped_refptr<Backend> backend_;
DISALLOW_COPY_AND_ASSIGN(VersionLoader);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_VERSION_LOADER_H_
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