move files out of common

MediaBrowser.Common.Implementations/Configuration/ConfigurationHelper.cs

@@ -0,0 +1,59 @@
+using MediaBrowser.Model.Serialization;
+using System;
+using System.IO;
+using System.Linq;
+
+namespace MediaBrowser.Common.Implementations.Configuration
+{
+    /// <summary>
+    /// Class ConfigurationHelper
+    /// </summary>
+    public static class ConfigurationHelper
+    {
+        /// <summary>
+        /// Reads an xml configuration file from the file system
+        /// It will immediately re-serialize and save if new serialization data is available due to property changes
+        /// </summary>
+        /// <param name="type">The type.</param>
+        /// <param name="path">The path.</param>
+        /// <param name="xmlSerializer">The XML serializer.</param>
+        /// <returns>System.Object.</returns>
+        public static object GetXmlConfiguration(Type type, string path, IXmlSerializer xmlSerializer)
+        {
+            object configuration;
+
+            byte[] buffer = null;
+
+            // Use try/catch to avoid the extra file system lookup using File.Exists
+            try
+            {
+                buffer = File.ReadAllBytes(path);
+
+                configuration = xmlSerializer.DeserializeFromBytes(type, buffer);
+            }
+            catch (Exception)
+            {
+                configuration = Activator.CreateInstance(type);
+            }
+
+            using (var stream = new MemoryStream())
+            {
+                xmlSerializer.SerializeToStream(configuration, stream);
+
+                // Take the object we just got and serialize it back to bytes
+                var newBytes = stream.ToArray();
+
+                // If the file didn't exist before, or if something has changed, re-save
+                if (buffer == null || !buffer.SequenceEqual(newBytes))
+                {
+                    Directory.CreateDirectory(Path.GetDirectoryName(path));
+
+                    // Save it after load in case we got new items
+                    File.WriteAllBytes(path, newBytes);
+                }
+
+                return configuration;
+            }
+        }
+    }
+}