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.SizedReader;
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  import java.nio.ByteBuffer;
  
  public final class ByteBufferSizedReader
          implements SizedReader<ByteBuffer>, EnumMarshallable<ByteBufferSizedReader> {
      public static final ByteBufferSizedReader INSTANCE = new ByteBufferSizedReader();
  
      private ByteBufferSizedReader() {
      }
  
      @NotNull
      @Override
      public ByteBuffer read(@NotNull Bytes in, long size, @Nullable ByteBuffer using) {
          if (size < 0L || size > (long) Integer.MAX_VALUE)
              throw new IllegalArgumentException("ByteBuffer size should be non-negative int, " +
                      size + " given. Memory corruption?");
          int bufferCap = (int) size;
          if (using == null || using.capacity() < bufferCap) {
              using = ByteBuffer.allocate(bufferCap);
          } else {
              using.position(0);
              using.limit(bufferCap);
          }
          in.read(using);
          using.flip();
          return using;
      }
  
      @NotNull
      @Override
      public ByteBufferSizedReader readResolve() {
          return INSTANCE;
      }
  }
  