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// Copyright (c) 2012 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_SESSIONS_SESSION_ID_H_
#define CHROME_BROWSER_SESSIONS_SESSION_ID_H_
#include "base/basictypes.h"
namespace content {
class WebContents;
}
// Uniquely identifies a tab or window for the duration of a session.
class SessionID {
public:
typedef int32 id_type;
SessionID();
~SessionID() {}
// If the specified WebContents has a SessionTabHelper (probably because it
// was used as the contents of a tab), returns a tab id. This value is
// immutable for a given tab. It will be unique across Chrome within the
// current session, but may be re-used across sessions. Returns -1
// for a NULL WebContents or if the WebContents has no SessionTabHelper.
static id_type IdForTab(const content::WebContents* tab);
// If the specified WebContents has a SessionTabHelper (probably because it
// was used as the contents of a tab), and has ever been attached to a Browser
// window, returns Browser::session_id().id() for that Browser. If the tab is
// being dragged between Browser windows, returns the old window's id value.
// If the WebContents has a SessionTabHelper but has never been attached to a
// Browser window, returns an id value that is different from that of any
// Browser. Returns -1 for a NULL WebContents or if the WebContents has no
// SessionTabHelper.
static id_type IdForWindowContainingTab(const content::WebContents* tab);
// Returns the underlying id.
void set_id(id_type id) { id_ = id; }
id_type id() const { return id_; }
private:
id_type id_;
};
#endif // CHROME_BROWSER_SESSIONS_SESSION_ID_H_
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