/// <summary>
/// Initializes a new instance of the <see cref="ServiceResolveContext"/> of the
/// specified <paramref name="parentContext"/>.
/// </summary>
/// <remarks>The depth automatically increases.</remarks>
/// <param name="parentContext">the parent context to take the data from</param>
/// <param name="constructionMode"></param>
/// <param name="serviceType">the type of the new service being resolved</param>
/// <exception cref="ArgumentNullException">
/// thrown if the specified <paramref name="parentContext"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentNullException">
/// thrown if the specified <paramref name="serviceType"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="InvalidOperationException">
/// thrown if the maximum service resolve depth was exceeded.
/// </exception>
public ServiceResolveContext(ServiceResolveContext parentContext, ServiceConstructionMode constructionMode,
Type serviceType)
{
if (parentContext is null)
{
throw new ArgumentNullException(nameof(parentContext));
}
ParentType = parentContext.ServiceType;
Resolver = parentContext.Resolver;
Register = parentContext.Register;
ServiceType = serviceType;
ConstructionMode = GetServiceConstructionMode(constructionMode, parentContext.Resolver, parentContext);
// increase resolve depth and check if it was exceeded
if ((Depth = parentContext.Depth + 1) >= parentContext.Resolver.MaximumDepth)
{
throw new InvalidOperationException($"The maximum service resolve depth ({Depth}) was exceeded.");
}
#if DEBUG
TraceBuilder = parentContext.TraceBuilder;
#endif // DEBUG
}
private static ServiceConstructionMode GetServiceConstructionMode(ServiceConstructionMode mode,
IServiceResolver resolver, ServiceResolveContext parentContext = null)
{
// check if the mode is parent and the parent context is available
if (mode == ServiceConstructionMode.Parent && parentContext != null)
{
return(parentContext.ConstructionMode);
}
// check if not the default mode is used
if (mode != ServiceConstructionMode.Default)
{
// use selected mode
return(mode);
}
// use default construction mode
return(resolver.ServiceConstructionMode);
}