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 
22 namespace v4l2_camera_hal {
23 
24 // A ControlDelegate extends StateDelegate with a setter method.
25 template <typename T>
26 class ControlDelegateInterface : public StateDelegateInterface<T> {
27  public:
~ControlDelegateInterface()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