| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.cassandra.utils; |
| |
| import java.io.IOException; |
| |
| import org.apache.cassandra.db.TypeSizes; |
| import org.apache.cassandra.io.IVersionedSerializer; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| |
| public class NullableSerializer |
| { |
| |
| public static <T> void serializeNullable(IVersionedSerializer<T> serializer, T value, DataOutputPlus out, int version) throws IOException |
| { |
| out.writeBoolean(value != null); |
| if (value != null) |
| serializer.serialize(value, out, version); |
| } |
| |
| public static <T> T deserializeNullable(IVersionedSerializer<T> serializer, DataInputPlus in, int version) throws IOException |
| { |
| return in.readBoolean() ? serializer.deserialize(in, version) : null; |
| } |
| |
| public static <T> long serializedSizeNullable(IVersionedSerializer<T> serializer, T value, int version) |
| { |
| return value != null |
| ? TypeSizes.sizeof(true) + serializer.serializedSize(value, version) |
| : TypeSizes.sizeof(false); |
| } |
| |
| public static <T> IVersionedSerializer<T> wrap(IVersionedSerializer<T> wrap) |
| { |
| return new IVersionedSerializer<T>() { |
| public void serialize(T t, DataOutputPlus out, int version) throws IOException |
| { |
| serializeNullable(wrap, t, out, version); |
| } |
| |
| public T deserialize(DataInputPlus in, int version) throws IOException |
| { |
| return deserializeNullable(wrap, in, version); |
| } |
| |
| public long serializedSize(T t, int version) |
| { |
| return serializedSizeNullable(wrap, t, version); |
| } |
| }; |
| } |
| |
| } |