/// <summary>
/// Registers an instance of <see cref="Searcher"/> or <see cref="PostProcessor"/>
/// without settings, using its type name.
/// </summary>
/// <param name="context">The search context to alter.</param>
/// <param name="serviceName">Name of the service to register (case insensitive).</param>
/// <param name="settings">The optional settings instance for the service.</param>
/// <typeparam name="T">A type that inherits from <see cref="SearchContext"/>
/// or <see cref="PostProcessor"/>.</typeparam>
/// <returns>A <see cref="SearchContext"/> with the given service added.</returns>
public static SearchContext With(this SearchContext context, string serviceName,
object settings = null)
{
if (serviceName == null)
{
throw new ArgumentNullException(nameof(serviceName), $"{nameof(serviceName)} cannot be null");
}
if (serviceName.Trim() == string.Empty)
{
throw new ArgumentException($"{nameof(serviceName)} cannot be empty or contain only space", nameof(serviceName));
}
var type = context.GetType().GetTypeInfo().Assembly.GetTypes().Where(
@this => @this.Name.Equals(serviceName, StringComparison.OrdinalIgnoreCase))
.SingleOrDefault();
if (type == null)
{
throw new NotSupportedException($"{serviceName} service not found");
}
if (!type.IsSearcher() && !type.IsPostProcessor())
{
throw new NotSupportedException(
$"T must inherit from {nameof(Searcher)} or {nameof(PostProcessor)}");
}
var service = Activator.CreateInstance(type, settings);
return(new SearchContext(
context.Services.Add(service).Cast <Service>(),
new ContextSettings {
MaximumResults = context.Settings.MaximumResults
}));
}
/// <summary>Registers an instance of <c>Searcher</c> or <c>PostProcessor</c> without settings,
/// using its type name.</summary>
public static SearchContext With(this SearchContext context, string serviceName,
object settings = null)
{
Guard.AgainstNull(nameof(context), context);
Guard.AgainstNull(nameof(serviceName), serviceName);
Guard.AgainstEmptyWhiteSpace(nameof(serviceName), serviceName);
var type = context.GetType().GetTypeInfo().Assembly.GetTypes().Where(
@this => @this.Name.Equals(serviceName, StringComparison.OrdinalIgnoreCase))
.SingleOrDefault();
if (type == null)
{
throw new NotSupportedException($"{serviceName} service not found");
}
var service = Activator.CreateInstance(type, settings);
Guard.AgainstSubclassExcept <Service>(nameof(serviceName), service);
return(new SearchContext(
context.Services.Add(service),
context.Settings.Clone()));
}