1 /* 2 * Copyright (C) 2019 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 android.car; 18 19 import android.annotation.NonNull; 20 import android.car.annotation.OptionalFeature; 21 import android.os.RemoteException; 22 import android.util.ArrayMap; 23 24 import com.android.internal.annotations.GuardedBy; 25 26 /** 27 * This class declares all car features which does not have API as {@code String}. 28 * 29 * <p>Note that all {@code Car*Managers'} feature string is their service name 30 * {@code Car.*_SERVICE.} 31 * For features with APIs, subfeature {@code String} will be also defined inside the API. 32 * 33 * <p>To prevent potential conflict in feature / subfeature name, all feature name should use 34 * implementation package name space like {@code com.android.car.user.FeatureA} unless it is 35 * {@code Car.*_SERVICE}. 36 * 37 * <p>To define a subfeature, main feature should be already declared and sub feature name should 38 * have the format of "main_feature/sub_feature_name". Note that feature name cannot use '/' and 39 * should use only alphabet, digit, '_', '-' and '.'. 40 * 41 * @hide 42 */ 43 public final class CarFeatures { 44 /** 45 * Service to show initial user notice screen. This feature has no API and thus defined here. 46 * @hide */ 47 @OptionalFeature 48 public static String FEATURE_CAR_USER_NOTICE_SERVICE = 49 "com.android.car.user.CarUserNoticeService"; 50 51 // Local cache for making feature query fast. 52 // Key: feature name, value: supported or not. 53 @GuardedBy("mCachedFeatures") 54 private final ArrayMap<String, Boolean> mCachedFeatures = new ArrayMap<>(); 55 56 /** @hide */ isFeatureEnabled(@onNull ICar service, @NonNull String featureName)57 boolean isFeatureEnabled(@NonNull ICar service, @NonNull String featureName) { 58 synchronized (mCachedFeatures) { 59 Boolean supported = mCachedFeatures.get(featureName); 60 if (supported != null) { 61 return supported; 62 } 63 } 64 // Need to fetch from car service. This should happen only once 65 try { 66 boolean supported = service.isFeatureEnabled(featureName); 67 synchronized (mCachedFeatures) { 68 mCachedFeatures.put(featureName, Boolean.valueOf(supported)); 69 } 70 return supported; 71 } catch (RemoteException e) { 72 // car service has crashed. return false. 73 } 74 return false; 75 } 76 77 /** @hide */ resetCache()78 void resetCache() { 79 synchronized (mCachedFeatures) { 80 mCachedFeatures.clear(); 81 } 82 } 83 } 84