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.map.fromdocs;
  
  import net.openhft.chronicle.bytes.Bytes;
  import net.openhft.chronicle.core.util.ReadResolvable;
  import net.openhft.chronicle.hash.impl.util.Objects;
  import net.openhft.chronicle.hash.serialization.BytesReader;
  import net.openhft.chronicle.hash.serialization.BytesWriter;
  import net.openhft.chronicle.wire.WireIn;
  import net.openhft.chronicle.wire.WireOut;
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  import java.util.Arrays;
  
  public final class CharSequenceArrayBytesMarshaller
          implements BytesWriter<CharSequence[]>, BytesReader<CharSequence[]>,
          ReadResolvable<CharSequenceArrayBytesMarshaller> {
  
      static final CharSequenceArrayBytesMarshaller INSTANCE = new CharSequenceArrayBytesMarshaller();
  
      private CharSequenceArrayBytesMarshaller() {
      }
  
      @Override
      public void write(Bytes out, @NotNull CharSequence[] toWrite) {
          // Note that the *array length*, not the *serialization size* is written in the beginning,
          // so BytesWriter + BytesReader is the most suitable pair of serialization interfaces
          // to implement for CharSequence[] type
          out.writeInt(toWrite.length);
          for (CharSequence cs : toWrite) {
              // Assume elements non-null for simplicity
              Objects.requireNonNull(cs);
              out.writeUtf8(cs);
          }
      }
  
      @NotNull
      @Override
      public CharSequence[] read(Bytes in, @Nullable CharSequence[] using) {
          int len = in.readInt();
          if (using == null)
              using = new CharSequence[len];
          if (using.length != len)
              using = Arrays.copyOf(using, len);
          for (int i = 0; i < len; i++) {
              CharSequence cs = using[i];
              if (cs instanceof StringBuilder) {
                  in.readUtf8((StringBuilder) cs);
              } else {
                  StringBuilder sb = new StringBuilder(0);
                  in.readUtf8(sb);
                  using[i] = sb;
              }
          }
          return using;
      }
  
      @Override
      public void writeMarshallable(@NotNull WireOut wireOut) {
          // no fields to write
      }
  
      @Override
      public void readMarshallable(@NotNull WireIn wireIn) {
          // no fields to read
      }
  
      @NotNull
      @Override
      public CharSequenceArrayBytesMarshaller readResolve() {
          return INSTANCE;
      }
  }
  