Value class Roll not best solution for mapping. Why not a sealed class with data objects?

[wolfscowl]

Feature Description

If you want to map the role of a message for the presentation layer, for example, this is not possible with an exact mapping using the value class. Because a role could also theoretically be Role("Tom"). But the only accepted values of OpenAi are all contained in the class. You always need an unnecessary else branch, which then throws an exception or you introduce an unknown role in the presentantion layer for mapping in else branch.

@JvmInline
@Serializable
public value class Role(public val role: String) {
    public companion object {
        public val System: Role = Role("system")
        public val User: Role = Role("user")
        public val Assistant: Role = Role("assistant")
        public val Function: Role = Role("function")
        public val Tool: Role = Role("tool")
    }
}

Problem it Solves

Message(
  role = when(chatMessage.role) {
                  ChatRole.System -> Message.Role.System
                  ChatRole.Assistant -> Message.Role.Assistant
                  ChatRole.User -> Message.Role.User
                  ChatRole.Tool -> Message.Role.Tool
                  ChatRole.Function -> Message.Role.Function
                  else -> throw IllegalArgumentException("OpenAI Mapper: Unknown Role ${chatMessage.role} in" +  currentFileName())
                },
  ...
)

Proposed Solution

sealed class Role(val role: String) {
    data object System: Role("system")
    data object Assistant: Role("assistant")
    data object User: Role("user")
    data object Tool: Role("tool")
    data object Function: Role("function")
}

Additional Context

If anyone has a better solution on how to solve the problem, I would be very grateful.