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//-----------------------------------------------------------------------
// <copyright file="OpenIdExtensionFactoryAggregator.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.Extensions {
using System.Collections.Generic;
using DotNetOpenAuth.Messaging;
using DotNetOpenAuth.OpenId.ChannelElements;
using DotNetOpenAuth.OpenId.Messages;
/// <summary>
/// An OpenID extension factory that only delegates extension
/// instantiation requests to other factories.
/// </summary>
internal class OpenIdExtensionFactoryAggregator : IOpenIdExtensionFactory {
/// <summary>
/// The list of factories this factory delegates to.
/// </summary>
private List<IOpenIdExtensionFactory> factories = new List<IOpenIdExtensionFactory>(2);
/// <summary>
/// Initializes a new instance of the <see cref="OpenIdExtensionFactoryAggregator"/> class.
/// </summary>
internal OpenIdExtensionFactoryAggregator() {
}
/// <summary>
/// Gets the extension factories that this aggregating factory delegates to.
/// </summary>
/// <value>A list of factories. May be empty, but never null.</value>
internal IList<IOpenIdExtensionFactory> Factories {
get { return this.factories; }
}
#region IOpenIdExtensionFactory Members
/// <summary>
/// Creates a new instance of some extension based on the received extension parameters.
/// </summary>
/// <param name="typeUri">The type URI of the extension.</param>
/// <param name="data">The parameters associated specifically with this extension.</param>
/// <param name="baseMessage">The OpenID message carrying this extension.</param>
/// <param name="isProviderRole">A value indicating whether this extension is being received at the OpenID Provider.</param>
/// <returns>
/// An instance of <see cref="IOpenIdMessageExtension"/> if the factory recognizes
/// the extension described in the input parameters; <c>null</c> otherwise.
/// </returns>
/// <remarks>
/// This factory method need only initialize properties in the instantiated extension object
/// that are not bound using <see cref="MessagePartAttribute"/>.
/// </remarks>
public IOpenIdMessageExtension Create(string typeUri, IDictionary<string, string> data, IProtocolMessageWithExtensions baseMessage, bool isProviderRole) {
foreach (var factory in this.factories) {
IOpenIdMessageExtension result = factory.Create(typeUri, data, baseMessage, isProviderRole);
if (result != null) {
return result;
}
}
return null;
}
#endregion
/// <summary>
/// Loads the default factory and additional ones given by the configuration.
/// </summary>
/// <returns>A new instance of <see cref="OpenIdExtensionFactoryAggregator"/>.</returns>
internal static OpenIdExtensionFactoryAggregator LoadFromConfiguration() {
var factoriesElement = DotNetOpenAuth.Configuration.OpenIdElement.Configuration.ExtensionFactories;
var aggregator = new OpenIdExtensionFactoryAggregator();
aggregator.Factories.Add(new StandardOpenIdExtensionFactory());
aggregator.factories.AddRange(factoriesElement.CreateInstances(false, null));
return aggregator;
}
}
}
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