Chrome OS: Add bluetooth dbus clients for device discovery

chrome/browser/chromeos/dbus/bluetooth_manager_client.h

+// Copyright (c) 2011 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_DBUS_BLUETOOTH_MANAGER_CLIENT_H_
+#define CHROME_BROWSER_CHROMEOS_DBUS_BLUETOOTH_MANAGER_CLIENT_H_
+#pragma once
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/observer_list.h"
+
+namespace dbus {
+class Bus;
+}  // namespace dbus
+
+namespace chromeos {
+
+// BluetoothManagerClient is used to communicate with the bluetooth
+// daemon's Manager interface.
+class BluetoothManagerClient {
+ public:
+  // Interface for observing changes from the bluetooth manager.
+  class Observer {
+   public:
+    virtual ~Observer() {}
+
+    // Called when a local bluetooth adapter is removed.
+    // |adapter| is the dbus object path of the adapter.
+    virtual void AdapterRemoved(const std::string& adapter) {}
+
+    // Called when the default local bluetooth adapter changes.
+    // |adapter| is the dbus object path of the new default adapter.
+    // Not called if all adapters are removed.
+    virtual void DefaultAdapterChanged(const std::string& adapter) {}
+  };
+
+  virtual ~BluetoothManagerClient();
+
+  // Adds and removes the observer.
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+
+  // The DefaultAdapterCallback receives two arguments:
+  // std::string adapter - the unique identifier of the default adapter
+  // bool success - whether or not the request succeeded
+  typedef base::Callback<void(std::string, bool)> DefaultAdapterCallback;
+
+  // Retrieves the dbus object path for the default adapter.
+  // The default adapter is the preferred local bluetooth interface when a
+  // client does not specify a particular interface.
+  virtual void DefaultAdapter(const DefaultAdapterCallback& callback) = 0;
+
+  // Creates the instance.
+  static BluetoothManagerClient* Create(dbus::Bus* bus);
+
+ protected:
+  BluetoothManagerClient();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BluetoothManagerClient);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_DBUS_BLUETOOTH_MANAGER_CLIENT_H_