Web Extension Stack, yaay!

WebSocketExtensionStack.cs

using System.Collections.Generic;

namespace LoungeChat.Server {
	
	public class WebSocketExtensionStack {

		private List<IWebSocketExtension> _extensionstack = null;
		private List<IWebSocketExtension> _acceptedextensionstack = new List<IWebSocketExtension>( );

		public WebSocketExtensionStack( IEnumerable<IWebSocketExtension> extensions ) {
			if ( extensions == null )
				_extensionstack = new List<IWebSocketExtension>();
			else
				_extensionstack = new List<IWebSocketExtension>( extensions );
		}

		public IList<IWebSocketExtension> Accept ( WebSocketUpgradeRequest request ) {
			_acceptedextensionstack.Clear( );
			IList<string> targetstack = request.Extensions;
			for ( int e = 0; e < _extensionstack.Count; ++e ) {
				var ext = _extensionstack[e];
				int targetindex = targetstack.IndexOf( ext.Name );
				if ( targetindex == -1 ) {
					if ( ext.Required )
						throw new WebSocketExtensionException( "Extension required by this WebSocket was not found in the WebSocketUpgradeRequest" );
					continue;
				}
				_acceptedextensionstack.Add( ext );
			}
				
			return _acceptedextensionstack;
		}

		public void Encode ( ref WebSocketFrameData data ) {
			for ( int e = 0; e < _acceptedextensionstack.Count; ++e ) {
				_acceptedextensionstack[ e ].Encode( ref data );
			}
		}

		public void Decode( ref WebSocketFrameData data ) {
			for ( int e = 0; e < _acceptedextensionstack.Count; ++e ) {
				_acceptedextensionstack[ e ].Decode( ref data );
			}
		}

	}
}