content: /*
   * Copyright (C) 2018 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.internal.os;
  
  
  import android.app.AppGlobals;
  import android.content.pm.PackageInfo;
  import android.content.pm.PackageManager;
  import android.os.RemoteException;
  import android.os.UserHandle;
  
  import com.android.internal.annotations.VisibleForTesting;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /** Maps AppIds to their package names. */
  public final class AppIdToPackageMap {
      private final Map<Integer, String> mAppIdToPackageMap;
  
      @VisibleForTesting
      public AppIdToPackageMap(Map<Integer, String> appIdToPackageMap) {
          mAppIdToPackageMap = appIdToPackageMap;
      }
  
      /** Creates a new {@link AppIdToPackageMap} for currently installed packages. */
      public static AppIdToPackageMap getSnapshot() {
          List<PackageInfo> packages;
          try {
              packages = AppGlobals.getPackageManager()
                      .getInstalledPackages(PackageManager.MATCH_UNINSTALLED_PACKAGES
                                      | PackageManager.MATCH_DIRECT_BOOT_UNAWARE
                                      | PackageManager.MATCH_DIRECT_BOOT_AWARE,
                              UserHandle.USER_SYSTEM).getList();
          } catch (RemoteException e) {
              throw e.rethrowFromSystemServer();
          }
          final Map<Integer, String> map = new HashMap<>();
          for (PackageInfo pkg : packages) {
              final int uid = pkg.applicationInfo.uid;
              if (pkg.sharedUserId != null && map.containsKey(uid)) {
                  // Use sharedUserId string as package name if there are collisions
                  map.put(uid, "shared:" + pkg.sharedUserId);
              } else {
                  map.put(uid, pkg.packageName);
              }
          }
          return new AppIdToPackageMap(map);
      }
  
      /** Maps the AppId to a package name. */
      public String mapAppId(int appId) {
          String pkgName = mAppIdToPackageMap.get(appId);
          return pkgName == null ? String.valueOf(appId) : pkgName;
      }
  
      /** Maps the UID to a package name. */
      public String mapUid(int uid) {
          final int appId = UserHandle.getAppId(uid);
          final String pkgName = mAppIdToPackageMap.get(appId);
          final String uidStr = UserHandle.formatUid(uid);
          return pkgName == null ? uidStr : pkgName + '/' + uidStr;
      }
  }
  