EntrySerializer(String fieldId, Type type, BinarySerializerRepository serializerRepository) {
this.entryId = fieldId;
this.type = type;
this.metaData = ObjectUtil.checkNotNull(serializerRepository.getMetaData(type.getMetaDataId()));
this.serializerRepository = serializerRepository;
}
private void serialize(
final @CheckForNull Type declaredType,
@CheckForNull MetaData declaredMetaData,
@CheckForNull GenericValue value,
final ByteWriter destination) {
boolean optional = (declaredType == null || declaredType.isOptional());
boolean polymorphic =
(declaredMetaData == null || declaredMetaData.getMetaType().isPolymorphic());
if (value == null) {
if (!optional) {
throw new SerializerException("Non-optional entry '" + entryId + "' found to be null!");
}
if (polymorphic) {
serializerRepository
.getEntityIdSerializer()
.serialize(BootStrap.ID_NULL_REFERENCE, destination);
} else {
destination.putVarInt(0); // TODO optimize
}
return;
}
if (polymorphic) {
if (declaredMetaData == null || declaredMetaData.getMetaType() != MetaType.ENTITY) {
// Polymorphic type: Write actual type or 'null'-type.
serializerRepository
.getEntityIdSerializer()
.serialize(value.getActualMetaDataId(), destination);
}
} else {
// Non-polymorphic type: Do not write actual type.
if (optional) {
// As we do not serialize the type if the declared type is not
// polymorphic we need to serialize whether it is present or
// not.
destination.putVarInt(1); // TODO optimize
}
}
// TODO check that type matches declared type
// TODO replace ValueVisitor by switch over MetaType for symmetry with
// deserialize?
// Or replace MetaData with subclasses (probably better).
value.accept(
new ValueVisitor() {
@Override
public void visit(PrimitiveValue primitive) {
BinarySerializer<Object> serializer =
serializerRepository.getPrimitiveSerializer(primitive.getActualMetaDataId());
serializer.serialize(primitive.getValue(), destination);
}
@Override
public void visit(ValueObjectValue valueObject) {
BinarySerializer<ObjectInfo> serializer =
serializerRepository.getBinarySerializer(valueObject.getActualMetaDataId());
serializer.serialize(valueObject.getValue(), destination);
}
@Override
public void visit(EntityIdValue entityReference) {
serializerRepository
.getEntityIdSerializer()
.serialize(entityReference.getEntityId(), destination);
}
@Override
public void visit(CollectionValue collection) {
// Write element MetaDataId.
serializerRepository
.getEntityIdSerializer()
.serialize(collection.getValueMetaDataId(), destination);
// Write element count.
destination.putVarInt(collection.getCount());
// Write custom collection implementation data.
BinarySerializer<ObjectInfo> serializer =
serializerRepository.getBinarySerializer(collection.getActualMetaDataId());
serializer.serialize(collection.getCollectionInfo(), destination);
// Write all elements.
for (GenericValue element : collection.getValues()) {
Type elementType = (declaredType == null) ? null : declaredType.getElementType();
MetaData metaData =
(elementType == null)
? null
: serializerRepository.getMetaData(elementType.getMetaDataId());
if (element == GenericValue.nullValue()) {
element = null;
}
serialize(elementType, metaData, element, destination);
}
}
@Override
public void visit(NullValue nullValue) {
throw new IllegalArgumentException("Cannot deserialize NullValue!");
}
});
}
@CheckForNull
private GenericValue deserializeValue(
ByteReader source, @CheckForNull Type declaredType, @CheckForNull MetaData declaredMetaData) {
boolean optional = (declaredType == null || declaredType.isOptional());
MetaData actualMetaData = null;
if (declaredMetaData == null || declaredMetaData.getMetaType().isPolymorphic()) {
if ((declaredMetaData != null) && (declaredMetaData.getMetaType() == MetaType.ENTITY)) {
actualMetaData = BootStrap.ENTITY_ID;
} else {
// Polymorphic type: Read actual type or 'null'-type.
EntityId actualTypeId = serializerRepository.getEntityIdSerializer().deserialize(source);
if (!BootStrap.ID_NULL_REFERENCE.equals(actualTypeId)) {
actualMetaData = serializerRepository.getMetaData(actualTypeId);
}
}
} else {
// Non-polymorphic type: Do not read actual type.
if (!optional || source.getVarInt() != 0) {
actualMetaData = declaredMetaData;
}
}
if (actualMetaData == null) {
if (!optional) {
throw new SerializerException("Non-optional entry found to be null!");
}
return null;
}
switch (actualMetaData.getMetaType()) {
case ENTITY:
{
EntityId entityId = serializerRepository.getEntityIdSerializer().deserialize(source);
return BootStrap.ID_NULL_REFERENCE.equals(entityId) ? null : new EntityIdValue(entityId);
}
case PRIMITIVE:
{
Primitive primitive = Primitive.byEntityId(actualMetaData.getEntityId());
BinarySerializer<?> serializer =
serializerRepository.getPrimitiveSerializer(actualMetaData.getEntityId());
return new PrimitiveValue(primitive, serializer.deserialize(source));
}
case VALUE_OBJECT:
{
BinarySerializer<ObjectInfo> serializer =
serializerRepository.getBinarySerializer(actualMetaData.getEntityId());
return new ValueObjectValue(serializer.deserialize(source));
}
case COLLECTION:
{
// Read element MetaDataId.
EntityId elementMetaDataId =
serializerRepository.getEntityIdSerializer().deserialize(source);
// Read element count.
int count = MathUtil.longToInt(source.getVarInt());
// Read custom collection implementation data.
BinarySerializer<ObjectInfo> serializer =
serializerRepository.getBinarySerializer(actualMetaData.getEntityId());
ObjectInfo collectionInfo = serializer.deserialize(source);
// Read all elements.
ImmutableArrayList.Builder<GenericValue> builder = ImmutableArrayList.newBuilder(count);
for (int i = 0; i < count; ++i) {
Type elementType = (declaredType == null) ? null : declaredType.getElementType();
MetaData metaData =
(elementType == null)
? null
: serializerRepository.getMetaData(elementType.getMetaDataId());
GenericValue value = deserializeValue(source, elementType, metaData);
builder.add((value == null) ? GenericValue.nullValue() : value);
}
return new CollectionValue(collectionInfo, elementMetaDataId, builder.build());
}
default:
throw new IllegalStateException("Unknown MetaType " + actualMetaData.getMetaType());
}
}