override fun mapToKotlinObject()

in graphql-dgs/src/main/kotlin/com/netflix/graphql/dgs/internal/DefaultInputObjectMapper.kt [91:122]

28 lines of code
6 McCabe index (conditional complexity)


    override fun <T : Any> mapToKotlinObject(
        inputMap: Map<String, *>,
        targetClass: KClass<T>,
    ): T {
        val constructor =
            targetClass.primaryConstructor
                ?: throw DgsInvalidInputArgumentException("No primary constructor found for class $targetClass")

        val parameters = constructor.parameters
        val parametersByName = CollectionUtils.newLinkedHashMap<KParameter, Any?>(parameters.size)

        for (parameter in parameters) {
            if (parameter.name !in inputMap) {
                if (parameter.isOptional) {
                    continue
                } else if (parameter.type.isMarkedNullable) {
                    parametersByName[parameter] = null
                    continue
                }
                throw DgsInvalidInputArgumentException("No value specified for required parameter ${parameter.name} of class $targetClass")
            }

            val input = inputMap[parameter.name]
            parametersByName[parameter] = maybeConvert(input, parameter.type)
        }

        return try {
            constructor.callBy(parametersByName)
        } catch (ex: Exception) {
            throw DgsInvalidInputArgumentException("Provided input arguments do not match arguments of data class `$targetClass`", ex)
        }
    }