Change channel type from string to simple enum

src/Examples/WpfFdc3/Fdc3/Channel.cs

@@ -26,7 +26,7 @@ public class Channel : IChannel
         private readonly Dictionary<string, IContext> _lastContexts = new Dictionary<string, IContext>();
         private IContext? _lastContext;
 
-        public Channel(string id, string type)
+        public Channel(string id, ChannelType type)
         {
             this.Id = id;
             this.Type = type;
@@ -35,7 +35,7 @@ public Channel(string id, string type)
 
         public string Id { get; }
 
-        public string Type { get; }
+        public ChannelType Type { get; }
 
         public IDisplayMetadata? DisplayMetadata => throw new System.NotImplementedException();
 

src/Examples/WpfFdc3/Fdc3/DesktopAgent.cs

@@ -28,7 +28,7 @@ internal class DesktopAgent : IDesktopAgent
 
         public DesktopAgent()
         {
-            _channels.Add(new Channel("global", "app"));
+            _channels.Add(new Channel("global", ChannelType.App));
         }
 
         public Task<IListener> AddContextListener<T>(string? contextType, ContextHandler<T> handler) where T : IContext
@@ -99,7 +99,7 @@ public Task<IChannel> GetOrCreateChannel(string channelId)
                 IChannel channel = _channels.First<IChannel>(channel => channel.Id == channelId);
                 if (channel == null)
                 {
-                    channel = new Channel(channelId, "app");
+                    channel = new Channel(channelId, ChannelType.App);
                     _channels.Add(channel);
                 }
 

src/Fdc3/ChannelType.cs

@@ -0,0 +1,23 @@
+/*
+ * Morgan Stanley makes this available to you under the Apache License,
+ * Version 2.0 (the "License"). You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * See the NOTICE file distributed with this work for additional information
+ * regarding copyright ownership. Unless required by applicable law or agreed
+ * to in writing, software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions
+ * and limitations under the License.
+ */
+
+namespace MorganStanley.Fdc3
+{
+    public enum ChannelType
+    {
+        User = 1,
+        App = 2,
+        Private = 3
+    }
+}

src/Fdc3/IChannel.cs

@@ -32,7 +32,7 @@ public interface IChannel: IIntentResult
         /// <summary>
         /// Uniquely defines each channel type.
         /// </summary>
-        string Type { get; }
+        ChannelType Type { get; }
 
         /// <summary>
         /// Channels may be visualized and selectable by users. DisplayMetadata may be used to provide hints on how to see them.

src/Tests/MorganStanley.Fdc3.Tests/IChannelTests.cs

@@ -36,7 +36,7 @@ private class MockChannel : IChannel
 
         public string Id => throw new NotImplementedException();
 
-        public string Type => throw new NotImplementedException();
+        public ChannelType Type => throw new NotImplementedException();
 
         public IDisplayMetadata? DisplayMetadata => throw new NotImplementedException();