1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
5  * except in compliance with the License. You may obtain a copy of the License at
6  *
7  *      http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the
10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
11  * KIND, either express or implied. See the License for the specific language governing
12  * permissions and limitations under the License.
13  */
14 
15 package com.android.systemui.plugins.annotations;
16 
17 import java.lang.annotation.Repeatable;
18 import java.lang.annotation.Retention;
19 import java.lang.annotation.RetentionPolicy;
20 
21 /**
22  * Used to annotate which interfaces a given plugin depends on.
23  *
24  * At minimum all plugins should have at least one @Requires annotation
25  * for the plugin interface that they are implementing. They will also
26  * need an @Requires for each class that the plugin interface @DependsOn.
27  */
28 @Retention(RetentionPolicy.RUNTIME)
29 @Repeatable(value = Requirements.class)
30 public @interface Requires {
target()31     Class<?> target();
version()32     int version();
33 }
34