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;
16 
17 import android.util.ArrayMap;
18 
19 import com.android.systemui.Dependency;
20 import com.android.systemui.plugins.PluginDependency.DependencyProvider;
21 import com.android.systemui.shared.plugins.PluginManager;
22 
23 import javax.inject.Inject;
24 import javax.inject.Singleton;
25 
26 import dagger.Lazy;
27 
28 /**
29  */
30 @Singleton
31 public class PluginDependencyProvider extends DependencyProvider {
32 
33     private final ArrayMap<Class<?>, Object> mDependencies = new ArrayMap<>();
34     private final Lazy<PluginManager> mManagerLazy;
35 
36     /**
37      */
38     @Inject
PluginDependencyProvider(Lazy<PluginManager> managerLazy)39     public PluginDependencyProvider(Lazy<PluginManager> managerLazy) {
40         mManagerLazy = managerLazy;
41         PluginDependency.sProvider = this;
42     }
43 
allowPluginDependency(Class<T> cls)44     public <T> void allowPluginDependency(Class<T> cls) {
45         allowPluginDependency(cls, Dependency.get(cls));
46     }
47 
allowPluginDependency(Class<T> cls, T obj)48     public <T> void allowPluginDependency(Class<T> cls, T obj) {
49         synchronized (mDependencies) {
50             mDependencies.put(cls, obj);
51         }
52     }
53 
54     @Override
get(Plugin p, Class<T> cls)55     <T> T get(Plugin p, Class<T> cls) {
56         if (!mManagerLazy.get().dependsOn(p, cls)) {
57             throw new IllegalArgumentException(p.getClass() + " does not depend on " + cls);
58         }
59         synchronized (mDependencies) {
60             if (!mDependencies.containsKey(cls)) {
61                 throw new IllegalArgumentException("Unknown dependency " + cls);
62             }
63             return (T) mDependencies.get(cls);
64         }
65     }
66 }
67