code: /*
   * Copyright 2012-2018 Chronicle Map Contributors
   *
   * 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 net.openhft.chronicle.hash.serialization.impl;
  
  import net.openhft.chronicle.bytes.Bytes;
  import net.openhft.chronicle.hash.serialization.BytesReader;
  import net.openhft.chronicle.hash.serialization.SizedReader;
  import net.openhft.chronicle.hash.serialization.StatefulCopyable;
  import net.openhft.chronicle.wire.WireIn;
  import net.openhft.chronicle.wire.WireOut;
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  public class BytesAsSizedReader<T>
          implements SizedReader<T>, StatefulCopyable<BytesAsSizedReader<T>> {
  
      /**
       * Config field
       */
      private BytesReader<T> reader;
  
      public BytesAsSizedReader(BytesReader<T> reader) {
          this.reader = reader;
      }
  
      @NotNull
      @Override
      public T read(Bytes in, long size, @Nullable T using) {
          return reader.read(in, using);
      }
  
      @Override
      public BytesAsSizedReader<T> copy() {
          if (reader instanceof StatefulCopyable) {
              return new BytesAsSizedReader<>(StatefulCopyable.copyIfNeeded(reader));
          } else {
              return this;
          }
      }
  
      @Override
      public void readMarshallable(@NotNull WireIn wireIn) {
          reader = wireIn.read(() -> "reader").typedMarshallable();
      }
  
      @Override
      public void writeMarshallable(@NotNull WireOut wireOut) {
          wireOut.write(() -> "reader").typedMarshallable(reader);
      }
  }
  