@Nullable
public Object valueToDatabase(@Nullable Object value) {
if (value == null) return null;
TypeConversion conversion =
typeConversionRegistry.findConversionToDb(value.getClass()).orElse(null);
if (conversion != null) return conversion.convert(value);
else if (value instanceof Enum<?>) return dialect.valueToDatabase(((Enum<?>) value).name());
else return dialect.valueToDatabase(value);
}
/**
* Returns conversion for converting value of source to target, or returns null if there's no such
* conversion.
*/
@NotNull
private Optional<TypeConversion> findConversionFromDbValue(
@NotNull Type source, @NotNull Type target) {
if (isAssignable(target, source)) return Optional.of(TypeConversion.identity());
Optional<TypeConversion> directConversion =
typeConversionRegistry.findConversionFromDbValue(source, target);
if (directConversion.isPresent()) return directConversion;
Optional<TypeConversion> arrayConversion = findArrayConversion(source, target);
if (arrayConversion.isPresent()) return arrayConversion;
Optional<TypeConversion> optionalConversion = findOptionalConversion(source, target);
if (optionalConversion.isPresent()) return optionalConversion;
Optional<TypeConversion> enumConversion = findEnumConversion(target);
if (enumConversion.isPresent()) return enumConversion;
return Optional.empty();
}