trail-into-darkness/Assets/Code/GameState/Entities/CharacterAttributesFactory.cs

using System;

namespace Nox.Game {
    public interface ICharacterAttributesFactory {
        EntityAttributes Create(EntityAttributes attributes);
    }

    public sealed class CharacterAttributesFactory : ICharacterAttributesFactory {
        private readonly CharacterRegistry characterRegistry;

        public CharacterAttributesFactory(CharacterRegistry characterRegistry) {
            this.characterRegistry = characterRegistry;
        }

        public EntityAttributes Create(EntityAttributes attributes) {
            if(attributes.might <= 0 || attributes.reflex <= 0 || attributes.knowledge <= 0 || attributes.perception <= 0) {
                throw new ArgumentOutOfRangeException( "attributes cannot be zero or negative.", new ArgumentException() );
            }

            return attributes;
        }
    }
}