/// <summary>
/// Branches the request pipeline based on the async result of the given predicate.
/// </summary>
/// <param name="app"></param>
/// <param name="predicate">Invoked asynchronously with the request environment to determine if the branch should be taken</param>
/// <param name="configuration">Configures a branch to take</param>
/// <returns></returns>
public static IAppBuilder MapWhenAsync(this IAppBuilder app, PredicateAsync predicate, Action<IAppBuilder> configuration)
{
if (app == null)
{
throw new ArgumentNullException("app");
}
if (predicate == null)
{
throw new ArgumentNullException("predicate");
}
if (configuration == null)
{
throw new ArgumentNullException("configuration");
}
// put middleware in pipeline before creating branch
var options = new MapWhenOptions { PredicateAsync = predicate };
IAppBuilder result = app.Use<MapWhenMiddleware>(options);
// create branch and assign to options
IAppBuilder branch = app.New();
configuration(branch);
options.Branch = (AppFunc)branch.Build(typeof(AppFunc));
return result;
}
/// <summary>
/// Initializes a new instance of the <see cref="MapWhenMiddleware"/> class
/// </summary>
/// <param name="next">The normal application pipeline</param>
/// <param name="options"></param>
public MapWhenMiddleware(AppFunc next, MapWhenOptions options)
{
if (next == null)
{
throw new ArgumentNullException("next");
}
if (options == null)
{
throw new ArgumentNullException("options");
}
_next = next;
_options = options;
}
/// <summary>
/// Initializes a new instance of the <see cref="MapWhenMiddleware"/> class
/// </summary>
/// <param name="next">The normal application pipeline</param>
/// <param name="options"></param>
public MapWhenMiddleware(OwinMiddleware next, MapWhenOptions options)
: base(next)
{
if (next == null)
{
throw new ArgumentNullException("next");
}
if (options == null)
{
throw new ArgumentNullException("options");
}
_options = options;
}
/// <summary>
/// Initializes a new instance of the <see cref="MapWhenMiddleware"/> class
/// </summary>
/// <param name="next">The normal application pipeline</param>
/// <param name="options"></param>
public MapWhenMiddleware(AppFunc next, MapWhenOptions options)
{
if (next == null)
{
throw new ArgumentNullException("next");
}
if (options == null)
{
throw new ArgumentNullException("options");
}
_next = next;
_options = options;
}