package org.djutils.serialization.serializers;
   
   import org.djunits.unit.Unit;
   import org.djutils.serialization.DisplayType;
   import org.djutils.serialization.EndianUtil;
   import org.djutils.serialization.SerializationUnits;
   
   /**
    * Abstract class to (de)serializes a DJUNITS value.
   * <p>
   * Copyright (c) 2019-2025 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://djunits.org/docs/license.html">DJUNITS License</a>.
   * </p>
   * @author <a href="https://www.tudelft.nl/averbraeck" target="_blank">Alexander Verbraeck</a>
   * @param <U> the unit type
   * @param <T> the object type
   */
  public abstract class ObjectWithUnitSerializer<U extends Unit<U>, T> extends ObjectSerializer<T>
  {
      /**
       * Construct a new ObjectWithUnitSerializer.
       * @param type the field type (returned by the <code>fieldType</code> method)
       * @param dataClassName returned by the dataClassName method
       */
      public ObjectWithUnitSerializer(final byte type, final String dataClassName)
      {
          super(type, dataClassName);
      }
  
      /**
       * Code a unit.
       * @param unit the unit to code in the byte array
       * @param message the byte array
       * @param pointer the start pointer in the byte array
       * @param endianUtil encoder to use for multi-byte values
       */
      protected void encodeUnit(final U unit, final byte[] message, final Pointer pointer, final EndianUtil endianUtil)
      {
          SerializationUnits unitType = SerializationUnits.getUnitType(unit);
          message[pointer.getAndIncrement(1)] = unitType.getCode();
          DisplayType displayType = DisplayType.getDisplayType(unit);
          message[pointer.getAndIncrement(1)] = displayType.getByteCode();
      }
  
      /**
       * Retrieve and decode a DJUNITS unit.
       * @param buffer the encoded data
       * @param pointer position in the encoded data where the unit is to be decoded from
       * @param endianUtil decoder for multi-byte values
       * @return Unit
       */
      @SuppressWarnings("unchecked")
      protected U getUnit(final byte[] buffer, final Pointer pointer, final EndianUtil endianUtil)
      {
          SerializationUnits unitType = SerializationUnits.getUnitType(buffer[pointer.getAndIncrement(1)]);
          DisplayType displayType = DisplayType.getDisplayType(unitType, 0 + buffer[pointer.getAndIncrement(1)]);
          return (U) displayType.getDjunitsType();
      }
  
      @Override
      public boolean hasUnit()
      {
          return true;
      }
  
  }