/// <summary>
/// Private implementation that removes the ambient scope known to be the current one.
/// Must only be called with the current, non-null scope.
/// </summary>
private static void RemoveAmbientScope(AmbientScope <TConcreteScope> ambientScope)
{
System.Diagnostics.Debug.Assert(ambientScope != null);
System.Diagnostics.Debug.Assert(ambientScope == CurrentAmbientScope.Value);
ReplaceAmbientScope(ambientScope, ambientScope.PhysicalParentScope);
}
/// <summary>
/// <para>
/// Replaces the current ambient scope by the given new ambient scope or null.
/// </para>
/// <para>
/// Throws if the current ambient scope is incorrect or the new ambient scope is already the current scope.
/// </para>
/// </summary>
/// <param name="currentScope">The scope that is currently the ambient scope. Must be correct. May be null.</param>
/// <param name="newAmbientScope">The scope that is to be set as the ambient scope. May be null.</param>
protected static void ReplaceAmbientScope(AmbientScope <TConcreteScope> currentScope, AmbientScope <TConcreteScope>?newAmbientScope)
{
if (!ReferenceEquals(currentScope, CurrentAmbientScope.Value))
{
throw new InvalidOperationException("The supposed current scope was not the current ambient scope. Always dispose or deactivate in reverse order of creation.");
}
SetAmbientScope(newAmbientScope);
}
/// <summary>
/// Makes the given scope the ambient one.
/// Throws if it already is.
/// </summary>
/// <param name="newAmbientScope">The scope that is to be set as the ambient scope. May be null.</param>
protected static void SetAmbientScope(AmbientScope <TConcreteScope>?newAmbientScope)
{
if (newAmbientScope is null)
{
CurrentAmbientScope.Value = null;
return;
}
if (ReferenceEquals(newAmbientScope, CurrentAmbientScope.Value))
{
throw new InvalidOperationException("The given scope was already the current ambient scope.");
}
CurrentAmbientScope.Value = (TConcreteScope)newAmbientScope;
}
