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