ByteStringToParcelableConverter.java
/*
* 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 com.google.common.base.Preconditions.checkNotNull;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.Parcelable.Creator;
import android.support.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;
}
}