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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_SESSIONS_CONTENT_NAVIGATION_TASK_ID_H_
#define COMPONENTS_SESSIONS_CONTENT_NAVIGATION_TASK_ID_H_
#include <stdint.h>
#include "base/supports_user_data.h"
#include "components/sessions/core/sessions_export.h"
namespace content {
class NavigationEntry;
}
namespace sessions {
// Stores Task ID data in a NavigationEntry. Task IDs track navigations and
// relationships between navigations
class SESSIONS_EXPORT NavigationTaskId : public base::SupportsUserData::Data {
public:
NavigationTaskId();
NavigationTaskId(const NavigationTaskId& navigation_task_id);
~NavigationTaskId() override;
static NavigationTaskId* Get(content::NavigationEntry* entry);
int64_t id() const { return id_; }
int64_t parent_id() const { return parent_id_; }
int64_t root_id() const { return root_id_; }
void set_id(int64_t id) { id_ = id; }
void set_parent_id(int64_t parent_id) { parent_id_ = parent_id; }
void set_root_id(int64_t root_id) { root_id_ = root_id; }
// base::SupportsUserData::Data:
std::unique_ptr<base::SupportsUserData::Data> Clone() override;
private:
// A Task is a collection of navigations.
//
// A Task ID is an identifier of a Task. It is a Unique ID upon the first
// navigation - navigating via the back button will not create a new ID but
// the ID upon the first navigation will be used.
//
// A Parent Task ID is the identifier for the previous task in a series of
// navigations.
//
// A Root Task ID is the first Task ID in a collection of navigations. Root
// Task IDs are tracked for task clustering in the event that an intermediate
// Tab is closed. It is not possible to group the tasks via a tree traversal
// in this situation.
int64_t id_ = -1;
int64_t parent_id_ = -1;
int64_t root_id_ = -1;
};
} // namespace sessions
#endif // COMPONENTS_SESSIONS_CONTENT_NAVIGATION_TASK_ID_H_
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