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// Copyright 2019 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_SIMPLE_DOWNLOAD_MANAGER_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_COMMON_SIMPLE_DOWNLOAD_MANAGER_H_
#include <memory>
#include <string>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "components/download/public/common/download_export.h"
#include "components/download/public/common/download_url_parameters.h"
namespace download {
class DownloadItem;
// Download manager that provides simple functionalities for callers to carry
// out a download task.
class COMPONENTS_DOWNLOAD_EXPORT SimpleDownloadManager {
public:
class Observer {
public:
Observer() = default;
Observer(const Observer&) = delete;
Observer& operator=(const Observer&) = delete;
virtual ~Observer() = default;
virtual void OnDownloadsInitialized() {}
virtual void OnManagerGoingDown() {}
virtual void OnDownloadCreated(DownloadItem* item) {}
};
SimpleDownloadManager();
virtual ~SimpleDownloadManager();
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Download a URL given by the |params|. Returns true if the download could
// take place, or false otherwise.
virtual void DownloadUrl(
std::unique_ptr<DownloadUrlParameters> parameters) = 0;
// Returns whether the manager can handle this download.
virtual bool CanDownload(DownloadUrlParameters* parameters) = 0;
using DownloadVector = std::vector<raw_ptr<DownloadItem, VectorExperimental>>;
// Add all initialized download items to |downloads|, no matter the type or
// state, without clearing |downloads| first. If active downloads are not
// initialized, this call will not return them. Caller should call
// GetUninitializedActiveDownloadsIfAny() below to retrieve uninitialized
// active downloads.
virtual void GetAllDownloads(DownloadVector* downloads) = 0;
// Gets all the active downloads that are initialized yet.
virtual void GetUninitializedActiveDownloadsIfAny(DownloadVector* downloads) {
}
// Get the download item for |guid|.
virtual DownloadItem* GetDownloadByGuid(const std::string& guid) = 0;
// Checks whether downloaded files still exist. Updates state of downloads
// that refer to removed files. The check runs in the background and may
// finish asynchronously after this method returns.
virtual void CheckForHistoryFilesRemoval() {}
protected:
// Called when the manager is initailized.
void OnInitialized();
// Called when a new download is created.
void OnNewDownloadCreated(DownloadItem* download);
// Notify observers that this object is initialized.
void NotifyInitialized();
// Whether this object is initialized.
bool initialized_ = false;
// Observers that want to be notified of changes to the set of downloads.
base::ObserverList<Observer>::Unchecked simple_download_manager_observers_;
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_PUBLIC_COMMON_SIMPLE_DOWNLOAD_MANAGER_H_
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