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.bytes.BytesUtil;
  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 static net.openhft.chronicle.hash.serialization.impl.DefaultElasticBytes.DEFAULT_BYTES_CAPACITY;
  
  abstract class AbstractCharSequenceUtf8DataAccess<T extends CharSequence> extends AbstractData<T>
          implements DataAccess<T>, Data<T> {
  
      /**
       * State field
       */
      transient T cs;
      /**
       * Cache field
       */
      private transient Bytes bytes;
  
      AbstractCharSequenceUtf8DataAccess(long bytesCapacity) {
          initTransients(bytesCapacity);
      }
  
      private void initTransients(long bytesCapacity) {
          bytes = DefaultElasticBytes.allocateDefaultElasticBytes(bytesCapacity);
      }
  
      @Override
      public Data<T> getData(@NotNull T cs) {
          this.cs = cs;
          bytes.clear();
          BytesUtil.appendUtf8(bytes, cs);
          return this;
      }
  
      @Override
      public void uninit() {
          cs = null;
      }
  
      @Override
      public void readMarshallable(@NotNull WireIn wireIn) {
          // no config fields to read
          initTransients(DEFAULT_BYTES_CAPACITY);
      }
  
      @Override
      public void writeMarshallable(@NotNull WireOut wireOut) {
          // no config fields to write
      }
  
      @Override
      public RandomDataInput bytes() {
          return bytes.bytesStore();
      }
  
      @Override
      public long offset() {
          return 0;
      }
  
      @Override
      public long size() {
          return bytes.readRemaining();
      }
  
      @Override
      public T get() {
          return cs;
      }
  }
  