1 /*
2  * Copyright (C) 2017 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 package com.android.compatibility.common.util;
17 
18 import androidx.annotation.Nullable;
19 
20 /**
21  * Abstraction for a state that is managed somewhere, like Android Settings.
22  *
23  * @param <T> value type
24  */
25 public interface StateManager<T> {
26 
27     /**
28      * Sets a new state.
29      */
set(@ullable T value)30     void set(@Nullable T value);
31 
32     /**
33      * Gets the current state.
34      */
get()35     @Nullable T get();
36 }
37