port from perforce

intromat/NodeNetwork/ValidationResult.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NodeNetwork
+{
+    /// <summary>
+    /// A class that represents a generic validation result.
+    /// </summary>
+    public abstract class ValidationResult
+    {
+        /// <summary>
+        /// True if the subject is valid
+        /// </summary>
+        public bool IsValid { get; }
+
+        /// <summary>
+        /// A viewmodel of the message that is to be displayed explaining this validation result.
+        /// </summary>
+        public object MessageViewModel { get; }
+
+        protected ValidationResult(bool isValid, object messageViewModel)
+        {
+            this.IsValid = isValid;
+            this.MessageViewModel = messageViewModel;
+        }
+    }
+
+    /// <summary>
+    /// A validation of the node network.
+    /// </summary>
+    public class NetworkValidationResult : ValidationResult
+    {
+        /// <summary>
+        /// If false, the network is in a state where trying to parse it (by walking from node to node) can cause problems.
+        /// For example, this property is false if the network contains loops since parsing it could then result in infinite loops.
+        /// </summary>
+        public bool NetworkIsTraversable { get; }
+
+        public NetworkValidationResult(bool isValid, bool isTraversable, object messageViewModel) : base(isValid, messageViewModel)
+        {
+            NetworkIsTraversable = isTraversable;
+        }
+    }
+
+    /// <summary>
+    /// A validation of a connection between nodes.
+    /// </summary>
+    public class ConnectionValidationResult : ValidationResult
+    {
+        public ConnectionValidationResult(bool isValid, object messageViewModel) : base(isValid, messageViewModel)
+        {
+        }
+    }
+}