Inventory2/scripts/globals/NodeExtensions.cs

public static class NodeExtensions
{
	/// <summary>
	/// Similar to <see cref="Node.GetNodeOrNull{T}"/>, but throws a
	/// <see cref="InvalidOperationException"/> if the node at the given
	/// path does not exist, or a <see cref="InvalidCastException"/> if
	/// it is not of the correct type.
	/// </summary>
	public static T GetNodeOrThrow<T>(this Node self, NodePath path)
		where T : class
	{
		var result = self.GetNodeOrNull(path);
		if (result == null) throw new InvalidOperationException(
			$"Node at '{path}' not found");
		if (result is not T resultOfType) throw new InvalidCastException(
			$"Node at '{path}' is {result.GetType()}, expected {typeof(T)}");
		return resultOfType;
	}

	/// <summary>
	/// Finds the first parent of this node that is of
	/// type <paramref name="T"/> or null if not found.
	/// </summary>
	public static T FindParentOrNull<T>(this Node self)
		where T : class
	{
		while ((self = self.GetParent()) != null)
			if (self is T result) return result;
		return null;
	}

	/// <summary>
	/// Finds the first parent of this node that is of type <paramref name="T"/>
	/// or throws a <see cref="InvalidOperationException"/> if not found.
	/// </summary>
	public static T FindParentOrThrow<T>(this Node self)
			where T : class
		=> self.FindParentOrNull<T>() ?? throw new InvalidOperationException(
			$"No parent node of type {typeof(T)} found in hierarchy of '{self.GetPath()}'");

	/// <summary> Returns whether the current peer has authority over this node. </summary>
	public static bool IsAuthority(this Node self)
		=> self.Multiplayer.GetUniqueId() == self.GetMultiplayerAuthority();
}