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DJUTILS serialization of data structures
package org.djutils.serialization.serializers;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
import org.djunits.unit.SIUnit;
import org.djunits.unit.Unit;
import org.djunits.unit.scale.IdentityScale;
import org.djunits.unit.util.UnitRuntimeException;
import org.djunits.value.ValueRuntimeException;
import org.djunits.value.storage.StorageType;
import org.djunits.value.vdouble.scalar.base.DoubleScalar;
import org.djunits.value.vdouble.vector.SIVector;
import org.djunits.value.vdouble.vector.base.DoubleVector;
import org.djunits.value.vdouble.vector.data.DoubleVectorData;
import org.djutils.serialization.EndianUtil;
import org.djutils.serialization.FieldTypes;
import org.djutils.serialization.SerializationException;
/**
* (De)serializes a DJUNITS DoubleVector.
*
* Copyright (c) 2019-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
* BSD-style license. See DJUNITS License.
*
* @author Alexander Verbraeck
* @param the unit type
* @param the scalar type
* @param the vector type
*/
public class DoubleVectorSerializer, S extends DoubleScalar, V extends DoubleVector>
extends ArrayOrMatrixWithUnitSerializer
{
/** The cache to make the lookup of the constructor for a Vevtor belonging to a unit faster. */
private static final Map, Constructor>> CACHE = new HashMap<>();
/** */
public DoubleVectorSerializer()
{
super(FieldTypes.DOUBLE_64_UNIT_ARRAY, "Djunits_DoubleVector", 1);
}
@Override
public int size(final V adv) throws SerializationException
{
try
{
return 4 + 2 + 8 * adv.size();
}
catch (ValueRuntimeException e)
{
throw new SerializationException(e);
}
}
@Override
public void serialize(final V adv, final byte[] buffer, final Pointer pointer, final EndianUtil endianUtil)
throws SerializationException
{
try
{
endianUtil.encodeInt(adv.size(), buffer, pointer.getAndIncrement(4));
encodeUnit(adv.getDisplayUnit(), buffer, pointer, endianUtil);
for (int i = 0; i < adv.size(); i++)
{
endianUtil.encodeDouble(adv.get(i).getSI(), buffer, pointer.getAndIncrement(8));
}
}
catch (ValueRuntimeException e)
{
throw new SerializationException(e);
}
}
@Override
public V deSerialize(final byte[] buffer, final Pointer pointer, final EndianUtil endianUtil) throws SerializationException
{
int size = endianUtil.decodeInt(buffer, pointer.getAndIncrement(4));
Unit> unit = getUnit(buffer, pointer, endianUtil);
double[] array = new double[size];
for (int i = 0; i < size; i++)
{
array[i] = endianUtil.decodeDouble(buffer, pointer.getAndIncrement(8));
}
try
{
DoubleVectorData fvd = DoubleVectorData.instantiate(array, IdentityScale.SCALE, StorageType.DENSE);
return instantiateAnonymous(fvd, unit);
}
catch (ValueRuntimeException exception)
{
throw new SerializationException(exception);
}
}
/**
* Instantiate the DoubleVector based on its unit. Loose check for types on the compiler. This allows the unit to be
* specified as a Unit<?> type.
* Note that it is possible to make mistakes with anonymous units.
* @param data DoubleVectorData; the values
* @param unit Unit<?>; the unit in which the value is expressed
* @return V; an instantiated DoubleVector with the provided displayUunit
* @param the unit type
* @param the scalar type
* @param the vector type
*/
@SuppressWarnings("unchecked")
public static , S extends DoubleScalar,
V extends DoubleVector> V instantiateAnonymous(final DoubleVectorData data, final Unit unit)
{
try
{
Constructor> vectorConstructor = CACHE.get(unit);
if (vectorConstructor == null)
{
if (!unit.getClass().getSimpleName().endsWith("Unit"))
{
throw new ClassNotFoundException("Unit " + unit.getClass().getSimpleName()
+ " name does noet end with 'Unit'. Cannot find corresponding scalar");
}
Class> vectorClass;
if (unit instanceof SIUnit)
{
vectorClass = SIVector.class;
}
else
{
vectorClass = (Class>) Class.forName("org.djunits.value.vdouble.vector."
+ unit.getClass().getSimpleName().replace("Unit", "") + "Vector");
}
vectorConstructor = vectorClass.getDeclaredConstructor(DoubleVectorData.class, unit.getClass());
CACHE.put(unit, vectorConstructor);
}
return (V) vectorConstructor.newInstance(data, unit);
}
catch (ClassNotFoundException | NoSuchMethodException | SecurityException | InstantiationException
| IllegalAccessException | IllegalArgumentException | InvocationTargetException exception)
{
throw new UnitRuntimeException(
"Cannot instantiate DoubleVector of unit " + unit.toString() + ". Reason: " + exception.getMessage());
}
}
}