1 /*
2  * Copyright (C) 2022 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 package com.android.ondevicepersonalization.libraries.plugin;
18 
19 import org.checkerframework.checker.nullness.qual.Nullable;
20 
21 /**
22  * Interface for generic context object passed to the {@link Plugin} implementation, provided by the
23  * {@link PluginHost}.
24  */
25 public interface PluginContext {
26     /**
27      * Attempt to fetch an instance of a specified type, e.g. an interface for data-access.
28      *
29      * <p>There should be an implied contract between a given Plugin implementation and the
30      * PluginContext implementation passed to it about what types may be supplied via this method.
31      * The types may be entirely specific to the particular Plugin use case.
32      */
get(Class<T> clazz)33     default <T> @Nullable T get(Class<T> clazz) {
34         return null;
35     }
36 }
37