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