Adding more features to restore operation (#420)

* Adding more features to restore operations and added tests

src/Microsoft.SqlTools.ServiceLayer/Utility/GeneralRequestDetails.cs

@@ -0,0 +1,69 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Microsoft.SqlTools.Utility;
+
+namespace Microsoft.SqlTools.ServiceLayer.Utility
+{
+    public class GeneralRequestDetails
+    {
+        public GeneralRequestDetails()
+        {
+            Options = new Dictionary<string, object>();
+        }
+
+        protected T GetOptionValue<T>(string name)
+        {
+            T result = default(T);
+            if (Options != null && Options.ContainsKey(name))
+            {
+                object value = Options[name];
+                try
+                {
+                    if (value != null && (typeof(T) != value.GetType()))
+                    {
+                        if (typeof(T) == typeof(int) || typeof(T) == typeof(int?))
+                        {
+                            value = Convert.ToInt32(value);
+                        }
+                        else if (typeof(T) == typeof(bool) || typeof(T) == typeof(bool?))
+                        {
+                            value = Convert.ToBoolean(value);
+                        }
+                    }
+                    result = value != null ? (T)value : default(T);
+                }
+                catch
+                {
+                    result = default(T);
+                    Logger.Write(LogLevel.Warning, string.Format(CultureInfo.InvariantCulture,
+                        "Cannot convert option value {0}:{1} to {2}", name, value ?? "", typeof(T)));
+                }
+            }
+            return result;
+        }
+
+        protected void SetOptionValue<T>(string name, T value)
+        {
+            Options = Options ?? new Dictionary<string, object>();
+            if (Options.ContainsKey(name))
+            {
+                Options[name] = value;
+            }
+            else
+            {
+                Options.Add(name, value);
+            }
+        }
+
+        /// <summary>
+        /// Gets or Sets the options
+        /// </summary>
+        public Dictionary<string, object> Options { get; set; }
+    }
+}