1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef V4L2_CAMERA_HAL_METADATA_CONTROL_DELEGATE_INTERFACE_H_
18#define V4L2_CAMERA_HAL_METADATA_CONTROL_DELEGATE_INTERFACE_H_
19
20#include "state_delegate_interface.h"
21
22namespace v4l2_camera_hal {
23
24// A ControlDelegate extends StateDelegate with a setter method.
25template <typename T>
26class ControlDelegateInterface : public StateDelegateInterface<T> {
27 public:
28  virtual ~ControlDelegateInterface(){};
29
30  // ControlDelegates are allowed to be unreliable, so SetValue is best-effort;
31  // GetValue immediately after may not match (SetValue may, for example,
32  // automatically replace invalid values with valid ones,
33  // or have a delay before setting the requested value).
34  // Returns 0 on success, error code on failure.
35  virtual int SetValue(const T& value) = 0;
36  // Children must also override GetValue from StateDelegateInterface.
37};
38
39}  // namespace v4l2_camera_hal
40
41#endif  // V4L2_CAMERA_HAL_METADATA_CONTROL_DELEGATE_INTERFACE_H_
42