content: /*
   * Copyright (C) 2016 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 androidx.test.espresso.remote;
  
  import static androidx.test.internal.util.Checks.checkNotNull;
  
  import android.os.Parcel;
  import android.os.Parcelable;
  import android.os.Parcelable.Creator;
  import androidx.annotation.NonNull;
  import com.google.protobuf.ByteString;
  import java.lang.reflect.Field;
  import java.util.Locale;
  
  /** Converts a {@link ByteString} into a {@link Parcelable}. */
  final class ByteStringToParcelableConverter implements Converter<ByteString, Parcelable> {
  
    private final Class<Parcelable> parcelableClass;
  
    /**
     * Returns an instance of {@link ByteStringToParcelableConverter}.
     *
     * @param parcelableClass the class of the {@link Parcelable}
     */
    ByteStringToParcelableConverter(@NonNull Class<Parcelable> parcelableClass) {
      this.parcelableClass = checkNotNull(parcelableClass, "parcelableClass cannot be null!");
    }
  
    /**
     * Converts a {@link ByteString} into a {@link Parcelable}.
     *
     * @param byteString the {@link ByteString} encoding of the {@link Parcelable}
     * @return an instance of {@link Parcelable}
     */
    @Override
    public Parcelable convert(@NonNull ByteString byteString) {
      Parcel parcel = Parcel.obtain();
      byte[] bytes = byteString.toByteArray();
      Parcelable fromParcel = null;
      try {
        parcel.unmarshall(bytes, 0, bytes.length);
        // Move the current read/write position to the beginning
        parcel.setDataPosition(0);
        Field creatorField = parcelableClass.getField("CREATOR");
        Parcelable.Creator<?> creator = (Creator) creatorField.get(null);
        fromParcel = parcelableClass.cast(creator.createFromParcel(parcel));
      } catch (NoSuchFieldException nsfe) {
        throw new RemoteProtocolException(
            String.format(
                Locale.ROOT,
                "Cannot find CREATOR field for Parcelable %s",
                parcelableClass.getName()),
            nsfe);
      } catch (IllegalAccessException iae) {
        throw new RemoteProtocolException(
            String.format(
                Locale.ROOT,
                "Cannot create instance of %s. CREATOR field is inaccessible",
                parcelableClass.getName()),
            iae);
      } finally {
        if (parcel != null) {
          parcel.recycle();
        }
      }
      return fromParcel;
    }
  }
  