Import YamlDotNet.

Assets/YamlDotNet/Serialization/Utilities/SerializerState.cs

@@ -0,0 +1,67 @@
+// This file is part of YamlDotNet - A .NET library for YAML.
+// Copyright (c) Antoine Aubry and contributors
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+// of the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace YamlDotNet.Serialization.Utilities
+{
+    /// <summary>
+    /// A generic container that is preserved during the entire deserialization process.
+    /// Any disposable object added to this collection will be disposed when this object is disposed.
+    /// </summary>
+    public sealed class SerializerState : IDisposable
+    {
+        private readonly IDictionary<Type, object> items = new Dictionary<Type, object>();
+
+        public T Get<T>()
+            where T : class, new()
+        {
+            if (!items.TryGetValue(typeof(T), out var value))
+            {
+                value = new T();
+                items.Add(typeof(T), value);
+            }
+            return (T)value;
+        }
+
+        /// <summary>
+        /// Invokes <see cref="IPostDeserializationCallback.OnDeserialization" /> on all
+        /// objects added to this collection that implement <see cref="IPostDeserializationCallback" />.
+        /// </summary>
+        public void OnDeserialization()
+        {
+            foreach (var callback in items.Values.OfType<IPostDeserializationCallback>())
+            {
+                callback.OnDeserialization();
+            }
+        }
+
+        public void Dispose()
+        {
+            foreach (var disposable in items.Values.OfType<IDisposable>())
+            {
+                disposable.Dispose();
+            }
+        }
+    }
+}