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.io.UnversionedSerializer;
  import org.apache.cassandra.io.VersionedSerializer;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  
  /**
   * Utility for serializing/deserializing from/into generic interface fields where we know (and require) the
   * generic fields to be implementation specific classes
   */
  public class CastingSerializer
  {
      public static <Generic, Specific extends Generic, Version> VersionedSerializer<Generic, Version> create(Class<Specific> specificClass, VersionedSerializer<Specific, Version> specificSerializer)
      {
          return new Versioned<>(specificClass, specificSerializer);
      }
  
      public static <Generic, Specific extends Generic> UnversionedSerializer<Generic> create(Class<Specific> specificClass, UnversionedSerializer<Specific> specificSerializer)
      {
          return new Unversioned<>(specificClass, specificSerializer);
      }
  
      private static final class Versioned<Generic, Specific extends Generic, Version> implements VersionedSerializer<Generic, Version>
      {
          private final Class<Specific> specificClass;
          private final VersionedSerializer<Specific, Version> specificSerializer;
  
          private Versioned(Class<Specific> specificClass, VersionedSerializer<Specific, Version> specificSerializer)
          {
              this.specificClass = specificClass;
              this.specificSerializer = specificSerializer;
          }
  
          @Override
          public void serialize(Generic generic, DataOutputPlus out, Version version) throws IOException
          {
              specificSerializer.serialize(specificClass.cast(generic), out, version);
          }
  
          @Override
          public Generic deserialize(DataInputPlus in, Version version) throws IOException
          {
              Generic result = specificSerializer.deserialize(in, version);
              if (result != null && !specificClass.isInstance(result))
                  throw new IllegalStateException("Expected instance of " + specificClass.getName());
              return result;
          }
  
          @Override
          public long serializedSize(Generic generic, Version version)
          {
              return specificSerializer.serializedSize(specificClass.cast(generic), version);
          }
      }
  
      private static final class Unversioned<Generic, Specific extends Generic> implements UnversionedSerializer<Generic>
      {
          private final Class<Specific> specificClass;
          private final UnversionedSerializer<Specific> specificSerializer;
  
          private Unversioned(Class<Specific> specificClass, UnversionedSerializer<Specific> specificSerializer)
          {
              this.specificClass = specificClass;
              this.specificSerializer = specificSerializer;
          }
  
          @Override
          public void serialize(Generic generic, DataOutputPlus out) throws IOException
          {
              specificSerializer.serialize(specificClass.cast(generic), out);
          }
  
          @Override
          public Generic deserialize(DataInputPlus in) throws IOException
          {
              Generic result = specificSerializer.deserialize(in);
              if (result != null && !specificClass.isInstance(result))
                  throw new IllegalStateException("Expected instance of " + specificClass.getName());
              return result;
          }
  
          @Override
          public long serializedSize(Generic generic)
          {
              return specificSerializer.serializedSize(specificClass.cast(generic));
          }
      }
  }
  