ByteStringToTypeConverter.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 androidx.annotation.NonNull;
import com.google.protobuf.ByteString;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
/** Converts a {@link ByteString} into a type T. */
final class ByteStringToTypeConverter<T> implements Converter<ByteString, T> {
/**
* Converts a {@link ByteString} into a type T.
*
* @param byteString the {@link ByteString} encoding the value T
* @return an instance of type T
*/
@Override
@SuppressWarnings("unchecked") // safe covariant cast
public T convert(@NonNull ByteString byteString) {
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteString.toByteArray());
ObjectInputStream objectInputStream = null;
try {
objectInputStream = new ObjectInputStream(byteArrayInputStream);
return (T) objectInputStream.readObject();
} catch (IOException ioe) {
throw new RemoteProtocolException("Cannot read ByteString into object", ioe);
} catch (ClassNotFoundException cnfe) {
throw new RemoteProtocolException("Cannot find ByteString to object", cnfe);
} catch (ClassCastException cce) {
throw new RemoteProtocolException("Cannot cast ByteString to object", cce);
} finally {
try {
if (objectInputStream != null) {
objectInputStream.close();
}
} catch (IOException ex) {
// ignore close exception
}
}
}
}