From 17fdde66d94155fc62a034fa6658995bef6fd6e5 Mon Sep 17 00:00:00 2001
From: Jason Smith <jason.smith@xamarin.com>
Date: Tue, 22 Mar 2016 13:02:25 -0700
Subject: Initial import

---
 Xamarin.Forms.Platform.Android/Deserializer.cs | 89 ++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 Xamarin.Forms.Platform.Android/Deserializer.cs

(limited to 'Xamarin.Forms.Platform.Android/Deserializer.cs')

diff --git a/Xamarin.Forms.Platform.Android/Deserializer.cs b/Xamarin.Forms.Platform.Android/Deserializer.cs
new file mode 100644
index 00000000..4c62ad1a
--- /dev/null
+++ b/Xamarin.Forms.Platform.Android/Deserializer.cs
@@ -0,0 +1,89 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO.IsolatedStorage;
+using System.Runtime.Serialization;
+using System.Threading.Tasks;
+using System.Xml;
+
+namespace Xamarin.Forms.Platform.Android
+{
+	internal class Deserializer : IDeserializer
+	{
+		const string PropertyStoreFile = "PropertyStore.forms";
+
+		public Task<IDictionary<string, object>> DeserializePropertiesAsync()
+		{
+			// Deserialize property dictionary to local storage
+			// Make sure to use Internal
+			return Task.Run(() =>
+			{
+				using(IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
+				using(IsolatedStorageFileStream stream = store.OpenFile(PropertyStoreFile, System.IO.FileMode.OpenOrCreate))
+				using(XmlDictionaryReader reader = XmlDictionaryReader.CreateBinaryReader(stream, XmlDictionaryReaderQuotas.Max))
+				{
+					if (stream.Length == 0)
+						return null;
+
+					try
+					{
+						var dcs = new DataContractSerializer(typeof(Dictionary<string, object>));
+						return (IDictionary<string, object>)dcs.ReadObject(reader);
+					}
+					catch (Exception e)
+					{
+						Debug.WriteLine("Could not deserialize properties: " + e.Message);
+						Log.Warning("Xamarin.Forms PropertyStore", $"Exception while reading Application properties: {e}");
+					}
+				}
+
+				return null;
+			});
+		}
+
+		public Task SerializePropertiesAsync(IDictionary<string, object> properties)
+		{
+			properties = new Dictionary<string, object>(properties);
+			// Serialize property dictionary to local storage
+			// Make sure to use Internal
+			return Task.Run(() =>
+			{
+				var success = false;
+				using(IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
+				using(IsolatedStorageFileStream stream = store.OpenFile(PropertyStoreFile + ".tmp", System.IO.FileMode.OpenOrCreate))
+				using(XmlDictionaryWriter writer = XmlDictionaryWriter.CreateBinaryWriter(stream))
+				{
+					try
+					{
+						var dcs = new DataContractSerializer(typeof(Dictionary<string, object>));
+						dcs.WriteObject(writer, properties);
+						writer.Flush();
+						success = true;
+					}
+					catch (Exception e)
+					{
+						Debug.WriteLine("Could not serialize properties: " + e.Message);
+						Log.Warning("Xamarin.Forms PropertyStore", $"Exception while writing Application properties: {e}");
+					}
+				}
+
+				if (!success)
+					return;
+				using(IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
+				{
+					try
+					{
+						if (store.FileExists(PropertyStoreFile))
+							store.DeleteFile(PropertyStoreFile);
+						store.MoveFile(PropertyStoreFile + ".tmp", PropertyStoreFile);
+					}
+					catch (Exception e)
+					{
+						Debug.WriteLine("Could not move new serialized property file over old: " + e.Message);
+						Log.Warning("Xamarin.Forms PropertyStore", $"Exception while writing Application properties: {e}");
+					}
+				}
+			});
+		}
+	}
+}
\ No newline at end of file
-- 
cgit v1.2.3