content: /*
   * 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.UnversionedSerializer;
  import org.apache.cassandra.io.VersionedSerializer;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  
  public class NullableSerializer
  {
      public static <T> void serializeNullable(T value, DataOutputPlus out, UnversionedSerializer<T> serializer) throws IOException
      {
          out.writeBoolean(value != null);
          if (value != null)
              serializer.serialize(value, out);
      }
  
      public static <T> void serializeNullable(T value, DataOutputPlus out, int version, IVersionedSerializer<T> serializer) throws IOException
      {
          out.writeBoolean(value != null);
          if (value != null)
              serializer.serialize(value, out, version);
      }
  
      public static <T, Version> void serializeNullable(T value, DataOutputPlus out, Version version, VersionedSerializer<T, Version> serializer) throws IOException
      {
          out.writeBoolean(value != null);
          if (value != null)
              serializer.serialize(value, out, version);
      }
  
      public static <T> T deserializeNullable(DataInputPlus in, UnversionedSerializer<T> serializer) throws IOException
      {
          return in.readBoolean() ? serializer.deserialize(in) : null;
      }
  
      public static <T> T deserializeNullable(DataInputPlus in, int version, IVersionedSerializer<T> serializer) throws IOException
      {
          return in.readBoolean() ? serializer.deserialize(in, version) : null;
      }
  
      public static <T, Version> T deserializeNullable(DataInputPlus in, Version version, VersionedSerializer<T, Version> serializer) throws IOException
      {
          return in.readBoolean() ? serializer.deserialize(in, version) : null;
      }
  
      public static <T> long serializedNullableSize(T value, UnversionedSerializer<T> serializer)
      {
          return value != null
                 ? TypeSizes.sizeof(true) + serializer.serializedSize(value)
                 : TypeSizes.sizeof(false);
      }
  
      public static <T> long serializedNullableSize(T value, int version, IVersionedSerializer<T> serializer)
      {
          return value != null
                  ? TypeSizes.sizeof(true) + serializer.serializedSize(value, version)
                  : TypeSizes.sizeof(false);
      }
  
      public static <T, Version> long serializedNullableSize(T value, Version version, VersionedSerializer<T, Version> serializer)
      {
          return value != null
                 ? TypeSizes.sizeof(true) + serializer.serializedSize(value, version)
                 : TypeSizes.sizeof(false);
      }
  
      public static <T> UnversionedSerializer<T> wrap(UnversionedSerializer<T> wrap)
      {
          return new UnversionedSerializer<>()
          {
              @Override
              public void serialize(T t, DataOutputPlus out) throws IOException
              {
                  serializeNullable(t, out, wrap);
              }
  
              @Override
              public T deserialize(DataInputPlus in) throws IOException
              {
                  return deserializeNullable(in, wrap);
              }
  
              @Override
              public long serializedSize(T t)
              {
                  return serializedNullableSize(t, wrap);
              }
          };
      }
  
      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(t, out, version, wrap);
              }
  
              public T deserialize(DataInputPlus in, int version) throws IOException
              {
                  return deserializeNullable(in, version, wrap);
              }
  
              public long serializedSize(T t, int version)
              {
                  return serializedNullableSize(t, version, wrap);
              }
          };
      }
  
      public static <T, Version> VersionedSerializer<T, Version> wrap(VersionedSerializer<T, Version> wrap)
      {
          return new VersionedSerializer<>() {
              @Override
              public void serialize(T t, DataOutputPlus out, Version version) throws IOException
              {
                  serializeNullable(t, out, version, wrap);
              }
  
              @Override
              public T deserialize(DataInputPlus in, Version version) throws IOException
              {
                  return deserializeNullable(in, version, wrap);
              }
  
              @Override
              public long serializedSize(T t, Version version)
              {
                  return serializedNullableSize(t, version, wrap);
              }
          };
      }
  }
  