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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_DOWNLOAD_PUBLIC_COMMON_URL_DOWNLOAD_HANDLER_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_COMMON_URL_DOWNLOAD_HANDLER_H_
#include "components/download/public/common/download_export.h"
#include "components/download/public/common/download_url_parameters.h"
#include "components/download/public/common/url_loader_factory_provider.h"
namespace download {
struct DownloadCreateInfo;
class InputStream;
// Identifier for a UrlDownloadHandler to scope the lifetime of references.
// UrlDownloadHandlerID are derived from UrlDownloadHandler*, used in
// comparison only, and are never dereferenced. We use an std::uintptr_t here to
// match the size of a pointer, and to prevent dereferencing. Also, our
// tooling complains about dangling pointers if we pass around a raw ptr.
using UrlDownloadHandlerID = std::uintptr_t;
// Class for handling the download of a url. Implemented by child classes.
class COMPONENTS_DOWNLOAD_EXPORT UrlDownloadHandler {
public:
using UniqueUrlDownloadHandlerPtr =
std::unique_ptr<UrlDownloadHandler, base::OnTaskRunnerDeleter>;
// Class to be notified when download starts/stops.
class COMPONENTS_DOWNLOAD_EXPORT Delegate {
public:
virtual void OnUrlDownloadStarted(
std::unique_ptr<DownloadCreateInfo> download_create_info,
std::unique_ptr<InputStream> input_stream,
URLLoaderFactoryProvider::URLLoaderFactoryProviderPtr
url_loader_factory_provider,
UrlDownloadHandlerID downloader,
DownloadUrlParameters::OnStartedCallback callback) = 0;
// Called after the connection is cancelled or finished.
virtual void OnUrlDownloadStopped(UrlDownloadHandlerID downloader) = 0;
// Called when a UrlDownloadHandler is created.
virtual void OnUrlDownloadHandlerCreated(
UniqueUrlDownloadHandlerPtr downloader) {}
};
UrlDownloadHandler() = default;
UrlDownloadHandler(const UrlDownloadHandler&) = delete;
UrlDownloadHandler& operator=(const UrlDownloadHandler&) = delete;
virtual ~UrlDownloadHandler() = default;
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_PUBLIC_COMMON_URL_DOWNLOAD_HANDLER_H_
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