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.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 StringSizedReader implements SizedReader<String>, StatefulCopyable<StringSizedReader> {
  
      /**
       * Cache field
       */
      private transient StringBuilder sb;
  
      public StringSizedReader() {
          initTransients();
      }
  
      private void initTransients() {
          sb = new StringBuilder();
      }
  
      @NotNull
      @Override
      public String read(@NotNull Bytes in, long size, @Nullable String using) {
          if (0 > size || size > Integer.MAX_VALUE)
              throw new IllegalStateException("positive int size expected, " + size + " given");
          sb.setLength(0);
          BytesUtil.parseUtf8(in, sb, (int) size);
          return sb.toString();
      }
  
      @Override
      public StringSizedReader copy() {
          return new StringSizedReader();
      }
  
      @Override
      public void readMarshallable(@NotNull WireIn wireIn) {
          // no fields to read
          initTransients();
      }
  
      @Override
      public void writeMarshallable(@NotNull WireOut wireOut) {
          // no fields to write
      }
  }
  