KotlinValueObject Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/context/properties/bind/ValueObjectBinder.java lines 266–314

	private static final class KotlinValueObject<T> extends ValueObject<T> {

		private static final Annotation[] ANNOTATION_ARRAY = new Annotation[0];

		private final List<ConstructorParameter> constructorParameters;

		private KotlinValueObject(Constructor<T> primaryConstructor, KFunction<T> kotlinConstructor,
				ResolvableType type) {
			super(primaryConstructor);
			this.constructorParameters = parseConstructorParameters(kotlinConstructor, type);
		}

		private List<ConstructorParameter> parseConstructorParameters(KFunction<T> kotlinConstructor,
				ResolvableType type) {
			List<KParameter> parameters = kotlinConstructor.getParameters();
			List<ConstructorParameter> result = new ArrayList<>(parameters.size());
			for (KParameter parameter : parameters) {
				String name = getParameterName(parameter);
				ResolvableType parameterType = ResolvableType
					.forType(ReflectJvmMapping.getJavaType(parameter.getType()), type);
				Annotation[] annotations = parameter.getAnnotations().toArray(ANNOTATION_ARRAY);
				Assert.state(name != null, "'name' must not be null");
				result.add(new ConstructorParameter(name, parameterType, annotations));
			}
			return Collections.unmodifiableList(result);
		}

		private @Nullable String getParameterName(KParameter parameter) {
			return MergedAnnotations.from(parameter, parameter.getAnnotations().toArray(ANNOTATION_ARRAY))
				.get(Name.class)
				.getValue(MergedAnnotation.VALUE, String.class)
				.orElseGet(parameter::getName);
		}

		@Override
		List<ConstructorParameter> getConstructorParameters() {
			return this.constructorParameters;
		}

		static <T> @Nullable ValueObject<T> get(Constructor<T> bindConstructor, ResolvableType type,
				ParameterNameDiscoverer parameterNameDiscoverer) {
			KFunction<T> kotlinConstructor = ReflectJvmMapping.getKotlinFunction(bindConstructor);
			if (kotlinConstructor != null) {
				return new KotlinValueObject<>(bindConstructor, kotlinConstructor, type);
			}
			return DefaultValueObject.get(bindConstructor, type, parameterNameDiscoverer);
		}

	}