content: /*
   * Copyright (C) 2019 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.net.shared;
  
  import android.annotation.NonNull;
  
  import java.lang.reflect.Array;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.function.Function;
  
  /**
   * Utility methods to help convert to/from stable parcelables.
   * @hide
   */
  public final class ParcelableUtil {
      // Below methods could be implemented easily with streams, but streams are frowned upon in
      // frameworks code.
  
      /**
       * Convert a list of BaseType items to an array of ParcelableType items using the specified
       * converter function.
       */
      public static <ParcelableType, BaseType> ParcelableType[] toParcelableArray(
              @NonNull Collection<BaseType> base,
              @NonNull Function<BaseType, ParcelableType> conv,
              @NonNull Class<ParcelableType> parcelClass) {
          final ParcelableType[] out = (ParcelableType[]) Array.newInstance(parcelClass, base.size());
          int i = 0;
          for (BaseType b : base) {
              out[i] = conv.apply(b);
              i++;
          }
          return out;
      }
  
      /**
       * Convert an array of ParcelableType items to a list of BaseType items using the specified
       * converter function.
       */
      public static <ParcelableType, BaseType> ArrayList<BaseType> fromParcelableArray(
              @NonNull ParcelableType[] parceled, @NonNull Function<ParcelableType, BaseType> conv) {
          final ArrayList<BaseType> out = new ArrayList<>(parceled.length);
          for (ParcelableType t : parceled) {
              out.add(conv.apply(t));
          }
          return out;
      }
  }
  