From: Alexis Laferrière <alexis.laf@xymus.net>
Date: Thu, 11 Feb 2016 20:24:44 +0000 (-0500)
Subject: lib/ios: implement data_store using NSUserDefaults
X-Git-Url: http://nitlanguage.org

lib/ios: implement data_store using NSUserDefaults

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
---

diff --git a/lib/app/data_store.nit b/lib/app/data_store.nit
index 5c59036..4db4b22 100644
--- a/lib/app/data_store.nit
+++ b/lib/app/data_store.nit
@@ -26,6 +26,7 @@ import serialization
 # TODO: move on the platform once qualified names are understand in the condition
 import linux::data_store is conditional(linux)
 import android::data_store is conditional(android)
+import ios::data_store is conditional(ios)
 
 redef class App
 	# Services to store and load data
diff --git a/lib/ios/data_store.nit b/lib/ios/data_store.nit
new file mode 100644
index 0000000..6d1579d
--- /dev/null
+++ b/lib/ios/data_store.nit
@@ -0,0 +1,60 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Implements `app::data_store` using `NSUserDefaults`
+module data_store
+
+import app::data_store
+import cocoa::foundation
+private import json::serialization
+
+redef class App
+	redef var data_store = new UserDefaultView
+end
+
+private class UserDefaultView
+	super DataStore
+
+	# The `NSUserDefaults` used to implement `DataStore`
+	var user_defaults = new NSUserDefaults.standard_user_defaults is lazy
+
+	redef fun [](key)
+	do
+		var nsstr = user_defaults.string_for_key(key.to_nsstring)
+
+		if nsstr.address_is_null then return null
+
+		# TODO report errors
+		var deserializer = new JsonDeserializer(nsstr.to_s)
+		return deserializer.deserialize
+	end
+
+	redef fun []=(key, value)
+	do
+		var nsobject: NSString
+
+		if value == null then
+			nsobject = new NSString.nil
+		else
+			var serialized_string = new StringWriter
+			var serializer = new JsonSerializer(serialized_string)
+			serializer.serialize(value)
+
+			# TODO report errors
+			nsobject = serialized_string.to_s.to_nsstring
+		end
+
+		user_defaults.set_object(nsobject, key.to_nsstring)
+	end
+end