Components.cs

class Component
{
	private readonly IDictionary<string, object> _properties = new Dictionary<string, object>();

	public Component()
	{
	}

	public Component(IEnumerable<KeyValuePair<string, object>> properties)
	{
		_properties = new Dictionary<string, object>(properties);
	}
	
	public string Type
	{
		get { return this["_type"]; }
		protected set { this["_type"] = value; }
	}

	protected object this[string key]
	{
		get
		{
			return _properties[key];
		}

		set
		{
			AssertIsSimpleType(value);

			_properties[key] = value;
		}
	}

	public Component Clone()
	{
		var component = new Component(_properties);

		return component;
	}
	
	protected T GetItem<T>(string key)
	{
		var item = (T)this[key];

		return item;
	}

	private void AssertIsSimpleType(object item)
	{
		// Expand this later...
		var isSimpleType = item is string ||
			item is int ||
			item is long ||
			item is double ||
			item is Guid;

		if (!isSimpleType)
		{
			throw new InvalidTypeException();
		}
	}
}

class Position : Component
{
	public Position()
	{
		Type = "Position";
	}
	
	public double X
	{
		get { return GetItem<double>("X"); }
		set { this["X"] = value; }
	}

	public double Y
	{
		get { return GetItem<double>("Y"); }
		set { this["Y"] = value; }
	}

	public double Z
	{
		get { return GetItem<double>("Z"); }
		set { this["Z"] = value; }
	}
}