@NotNull
public Instantiator<?> findInstantiator(@NotNull Type type, @NotNull NamedTypeList types) {
// First check if we have an immediate conversion registered. If so, we'll just use that.
if (types.size() == 1) {
TypeConversion conversion = findConversionFromDbValue(types.getType(0), type).orElse(null);
if (conversion != null) return args -> conversion.convert(args.getSingleValue());
}
Class<?> cl = rawType(type);
Instantiator<?> instantiator = findExplicitInstantiatorFor(cl, types).orElse(null);
if (instantiator != null) return instantiator;
if (!isPublic(cl.getModifiers()))
throw new InstantiationFailureException(
type
+ " can't be instantiated reflectively because it is not public or missing a @DalesbredConstructor-annotation");
return candidateConstructorsSortedByDescendingParameterCount(cl)
.map(ctor -> implicitInstantiatorFrom(ctor, types).orElse(null))
.filter(Objects::nonNull)
.findFirst()
.orElseThrow(
() ->
new InstantiationFailureException(
"could not find a way to instantiate " + type + " with parameters " + types));
}
@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);
}
@NotNull
private static Optional<TypeConversion> findEnumConversion(@NotNull Type target) {
if (isEnum(target)) {
@SuppressWarnings("rawtypes")
Class<? extends Enum> cl = rawType(target).asSubclass(Enum.class);
return Optional.ofNullable(
TypeConversion.fromNonNullFunction(value -> Enum.valueOf(cl, value.toString())));
}
return Optional.empty();
}
/**
* 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();
}