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82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CORE_INTERNAL_MEDIUMS_BLUETOOTH_RADIO_H_
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#define CORE_INTERNAL_MEDIUMS_BLUETOOTH_RADIO_H_
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#include <cstdint>
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#include "internal/platform/atomic_boolean.h"
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#include "internal/platform/bluetooth_adapter.h"
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namespace nearby {
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namespace connections {
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// Provides the operations that can be performed on the Bluetooth radio.
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class BluetoothRadio {
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public:
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BluetoothRadio();
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BluetoothRadio(BluetoothRadio&&) = default;
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BluetoothRadio& operator=(BluetoothRadio&&) = default;
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// Reverts the Bluetooth radio to its original state.
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~BluetoothRadio();
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// Enables Bluetooth.
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//
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// This must be called before attempting to invoke any other methods of
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// this class.
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//
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// Returns true if enabled successfully.
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bool Enable();
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// Disables Bluetooth.
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//
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// Returns true if disabled successfully.
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bool Disable();
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// Returns true if the Bluetooth radio is currently enabled.
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bool IsEnabled() const;
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// Returns result of BluetoothAdapter::IsValid() for private adapter instance.
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bool IsAdapterValid() const { return bluetooth_adapter_.IsValid(); }
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BluetoothAdapter& GetBluetoothAdapter() { return bluetooth_adapter_; }
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private:
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bool SetBluetoothState(bool enable);
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bool IsInDesiredState(bool should_be_enabled) const;
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// To be called in enable() and disable(). This will remember the
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// original state of the radio before any radio state has been modified.
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// Returns false if Bluetooth doesn't exist on the device and the state cannot
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// be obtained.
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bool SaveOriginalState();
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// BluetoothAdapter::IsValid() will return false if BT is not supported.
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BluetoothAdapter bluetooth_adapter_;
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// The Bluetooth radio's original state, before we modified it. True if
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// originally enabled, false if originally disabled.
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// We restore the radio to its original state in the destructor.
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AtomicBoolean originally_enabled_{false};
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// false if we never modified the radio state, true otherwise.
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AtomicBoolean ever_saved_state_{false};
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};
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} // namespace connections
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} // namespace nearby
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#endif // CORE_INTERNAL_MEDIUMS_BLUETOOTH_RADIO_H_
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