package org.djutils.serialization.serializers;
   
   import org.djunits.unit.Unit;
   import org.djunits.unit.scale.IdentityScale;
   import org.djunits.value.ValueRuntimeException;
   import org.djunits.value.storage.StorageType;
   import org.djunits.value.vdouble.matrix.base.DoubleMatrix;
   import org.djunits.value.vdouble.matrix.base.DoubleMatrixInterface;
   import org.djunits.value.vdouble.matrix.data.DoubleMatrixData;
  import org.djunits.value.vdouble.scalar.base.DoubleScalarInterface;
  import org.djunits.value.vdouble.vector.base.DoubleVectorInterface;
  import org.djutils.serialization.EndianUtil;
  import org.djutils.serialization.FieldTypes;
  import org.djutils.serialization.SerializationException;
  
  /**
   * (De)serializes a DJUNITS DoubleMatrix.
   * <p>
   * Copyright (c) 2019-2022 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 <S> the scalar type
   * @param <V> the vector type
   * @param <M> the matrix type
   */
  public class DoubleMatrixSerializer<U extends Unit<U>, S extends DoubleScalarInterface<U, S>,
          V extends DoubleVectorInterface<U, S, V>, M extends DoubleMatrixInterface<U, S, V, M>>
          extends ArrayOrMatrixWithUnitSerializer<U, M>
  {
      /** */
      public DoubleMatrixSerializer()
      {
          super(FieldTypes.DOUBLE_64_UNIT_MATRIX, "Djunits_DoubleMatrix", 2);
      }
  
      /** {@inheritDoc} */
      @Override
      public int size(final M adm) throws SerializationException
      {
          try
          {
              return 4 + 4 + 2 + 8 * adm.rows() * adm.cols();
          }
          catch (ValueRuntimeException e)
          {
              throw new SerializationException(e);
          }
      }
  
      /** {@inheritDoc} */
      @Override
      public void serialize(final M adm, final byte[] buffer, final Pointer pointer, final EndianUtil endianUtil)
              throws SerializationException
      {
          try
          {
              endianUtil.encodeInt(adm.rows(), buffer, pointer.getAndIncrement(4));
              endianUtil.encodeInt(adm.cols(), buffer, pointer.getAndIncrement(4));
              encodeUnit(adm.getDisplayUnit(), buffer, pointer, endianUtil);
              for (int i = 0; i < adm.rows(); i++)
              {
                  for (int j = 0; j < adm.cols(); j++)
                  {
                      endianUtil.encodeDouble(adm.get(i, j).getSI(), buffer, pointer.getAndIncrement(8));
                  }
              }
          }
          catch (ValueRuntimeException e)
          {
              throw new SerializationException(e);
          }
      }
  
      /** {@inheritDoc} */
      @Override
      public M deSerialize(final byte[] buffer, final Pointer pointer, final EndianUtil endianUtil) throws SerializationException
      {
          try
          {
              int height = endianUtil.decodeInt(buffer, pointer.getAndIncrement(4));
              int width = endianUtil.decodeInt(buffer, pointer.getAndIncrement(4));
              Unit<? extends Unit<?>> unit = getUnit(buffer, pointer, endianUtil);
              double[][] array = new double[height][width];
              for (int i = 0; i < height; i++)
              {
                  for (int j = 0; j < width; j++)
                  {
                      array[i][j] = endianUtil.decodeDouble(buffer, pointer.getAndIncrement(8));
                  }
              }
              DoubleMatrixData fvd = DoubleMatrixData.instantiate(array, IdentityScale.SCALE, StorageType.DENSE);
              return DoubleMatrix.instantiateAnonymous(fvd, unit);
          }
          catch (ValueRuntimeException exception)
          {
              throw new SerializationException(exception);
          }
     }
 
 }