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// 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 com.google.gerrit.server.cache.serialize;
import com.google.common.base.Converter;
/**
* Interface for serializing/deserializing a type to/from a persistent cache.
*
* <p>Implementations are null-hostile and will throw exceptions from {@link #serialize} when passed
* null values, unless otherwise specified.
*/
public interface CacheSerializer<T> {
/**
* Convert a serializer of one type to another type using a {@link Converter}.
*
* @param delegate underlying serializer.
* @param converter converter between an arbitrary type {@code T} and {@code delegate}'s type.
* @return serializer of type {@code T}.
*/
static <T, D> CacheSerializer<T> convert(CacheSerializer<D> delegate, Converter<T, D> converter) {
return new CacheSerializer<>() {
@Override
public byte[] serialize(T object) {
return delegate.serialize(converter.convert(object));
}
@Override
public T deserialize(byte[] in) {
return converter.reverse().convert(delegate.deserialize(in));
}
};
}
/**
* Serializes the object to a new byte array.
*
* @param object object to serialize.
* @return serialized byte array representation.
* @throws RuntimeException for malformed input, for example null or an otherwise unsupported
* value.
*/
byte[] serialize(T object);
/**
* Deserializes a single object from the given byte array.
*
* @param in serialized byte array representation.
* @throws RuntimeException for malformed input, for example null or an otherwise corrupt
* serialized representation.
*/
T deserialize(byte[] in);
}
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