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.BytesStore;
  import net.openhft.chronicle.bytes.RandomDataInput;
  import net.openhft.chronicle.hash.AbstractData;
  import net.openhft.chronicle.hash.Data;
  import net.openhft.chronicle.hash.serialization.DataAccess;
  import net.openhft.chronicle.wire.WireIn;
  import net.openhft.chronicle.wire.WireOut;
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  import java.nio.charset.StandardCharsets;
  
  public class ByteArrayDataAccess extends AbstractData<byte[]> implements DataAccess<byte[]> {
  
      /**
       * Cache field
       */
      private transient BytesStore<?, ?> bs;
  
      /**
       * State field
       */
      private transient byte[] array;
  
      public ByteArrayDataAccess() {
          initTransients();
      }
  
      private void initTransients() {
          bs = null;
      }
  
      @Override
      public RandomDataInput bytes() {
          return bs;
      }
  
      @Override
      public long offset() {
          return bs.start();
      }
  
      @Override
      public long size() {
          return bs.capacity();
      }
  
      @Override
      public byte[] get() {
          return array;
      }
  
      @Override
      public byte[] getUsing(@Nullable byte[] using) {
          if (using == null || using.length != array.length)
              using = new byte[array.length];
          System.arraycopy(array, 0, using, 0, array.length);
          return using;
      }
  
      @Override
      public Data<byte[]> getData(@NotNull byte[] instance) {
          array = instance;
          bs = BytesStore.wrap(array);
          return this;
      }
  
      @Override
      public void uninit() {
          array = null;
          bs = null;
      }
  
      @Override
      public DataAccess<byte[]> copy() {
          return new ByteArrayDataAccess();
      }
  
      @Override
      public void writeMarshallable(@NotNull WireOut wireOut) {
          // no fields to write
      }
  
      @Override
      public void readMarshallable(@NotNull WireIn wireIn) {
          // no fields to read
          initTransients();
      }
  
      @Override
      public String toString() {
          return new String(array, StandardCharsets.UTF_8);
      }
  }
  