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 android.hardware.radio;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.os.Parcel;
  import android.os.Parcelable;
  import android.os.RemoteException;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Set;
  
  final class Utils {
      private static final String TAG = "BroadcastRadio.utils";
  
      static void writeStringMap(@NonNull Parcel dest, @Nullable Map<String, String> map) {
          if (map == null) {
              dest.writeInt(0);
              return;
          }
          dest.writeInt(map.size());
          for (Map.Entry<String, String> entry : map.entrySet()) {
              dest.writeString(entry.getKey());
              dest.writeString(entry.getValue());
          }
      }
  
      static @NonNull Map<String, String> readStringMap(@NonNull Parcel in) {
          int size = in.readInt();
          Map<String, String> map = new HashMap<>(size);
          while (size-- > 0) {
              String key = in.readString();
              String value = in.readString();
              map.put(key, value);
          }
          return map;
      }
  
      static void writeStringIntMap(@NonNull Parcel dest, @Nullable Map<String, Integer> map) {
          if (map == null) {
              dest.writeInt(0);
              return;
          }
          dest.writeInt(map.size());
          for (Map.Entry<String, Integer> entry : map.entrySet()) {
              dest.writeString(entry.getKey());
              dest.writeInt(entry.getValue());
          }
      }
  
      static @NonNull Map<String, Integer> readStringIntMap(@NonNull Parcel in) {
          int size = in.readInt();
          Map<String, Integer> map = new HashMap<>(size);
          while (size-- > 0) {
              String key = in.readString();
              int value = in.readInt();
              map.put(key, value);
          }
          return map;
      }
  
      static <T extends Parcelable> void writeSet(@NonNull Parcel dest, @Nullable Set<T> set) {
          if (set == null) {
              dest.writeInt(0);
              return;
          }
          dest.writeInt(set.size());
          set.stream().forEach(elem -> dest.writeTypedObject(elem, 0));
      }
  
      static <T> Set<T> createSet(@NonNull Parcel in, Parcelable.Creator<T> c) {
          int size = in.readInt();
          Set<T> set = new HashSet<>(size);
          while (size-- > 0) {
              set.add(in.readTypedObject(c));
          }
          return set;
      }
  
      static void writeIntSet(@NonNull Parcel dest, @Nullable Set<Integer> set) {
          if (set == null) {
              dest.writeInt(0);
              return;
          }
          dest.writeInt(set.size());
          set.stream().forEach(elem -> dest.writeInt(Objects.requireNonNull(elem)));
      }
  
      static Set<Integer> createIntSet(@NonNull Parcel in) {
          int size = in.readInt();
          Set<Integer> set = new HashSet<>(size);
          while (size-- > 0) {
              set.add(in.readInt());
          }
          return set;
      }
  
      static <T extends Parcelable> void writeTypedCollection(@NonNull Parcel dest,
              @Nullable Collection<T> coll) {
          ArrayList<T> list = null;
          if (coll != null) {
              if (coll instanceof ArrayList) {
                  list = (ArrayList) coll;
              } else {
                  list = new ArrayList<>(coll);
              }
          }
          dest.writeTypedList(list);
      }
  
      static void close(ICloseHandle handle) {
          try {
              handle.close();
          } catch (RemoteException ex) {
              ex.rethrowFromSystemServer();
          }
      }
  }
  