Recommendation.kt

@Aggregate
class Recommendation(val id: UUID = UUID.randomUUID(), val criteria: Criteria, talks: Set<Talk>) {

    val talks: Set<Talk>

    init {
        checkCriteriaTalkFormatsCorrespondToTheTalksOne(talks)
        this.talks = talks.toSet()
    }

    private fun checkCriteriaTalkFormatsCorrespondToTheTalksOne(talks: Set<Talk>) {
        if (talks.any { !criteria.hasTalkFormat(it.format) }) {
            throw IllegalArgumentException("Criteria talk formats doesn't correspond to the format of the recommended talks")
        }
    }
}