bluetooth: Standardize Bluetooth adapter access in Adapter service.

device/bluetooth/adapter_factory.h

+// Copyright 2016 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 DEVICE_BLUETOOTH_ADAPTER_FACTORY_H_
+#define DEVICE_BLUETOOTH_ADAPTER_FACTORY_H_
+
+#include "base/macros.h"
+#include "device/bluetooth/bluetooth_adapter.h"
+#include "device/bluetooth/public/interfaces/adapter.mojom.h"
+
+namespace bluetooth {
+
+// Implementation of Mojo AdapterFactory located in
+// device/bluetooth/public/interfaces/adapter.mojom.
+// It handles requests for Mojo Adapter instances
+// and strongly binds the Adapter instance to the system's
+// Bluetooth adapter.
+class AdapterFactory : public mojom::AdapterFactory {
+ public:
+  AdapterFactory();
+  ~AdapterFactory() override;
+
+  // Creates an AdapterFactory with a strong Mojo binding to |request|.
+  static void Create(mojom::AdapterFactoryRequest request);
+
+  // mojom::AdapterFactory overrides:
+  void GetAdapter(const GetAdapterCallback& callback) override;
+
+ private:
+  void OnGetAdapter(const GetAdapterCallback& callback,
+                    scoped_refptr<device::BluetoothAdapter> adapter);
+
+  base::WeakPtrFactory<AdapterFactory> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(AdapterFactory);
+};
+
+}  // namespace bluetooth
+
+#endif  // DEVICE_BLUETOOTH_ADAPTER_FACTORY_H_