--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+mpm/PersistentState.m	Tue Sep 18 11:41:39 2018 +0200
@@ -0,0 +1,28 @@
+classdef PersistentState < handle
+    properties
+        filepath
+        subpaths
+    end
+
+    methods
+        function obj = PersistentState(filepath)
+            obj.filepath = filepath;
+
+            try
+                % Read state from file
+                s = load(filepath);
+                obj.subpaths = s.subpaths;
+            catch
+                % If reading the file failed, create an empty state
+                obj.subpaths = containers.Map();
+            end
+        end
+
+        function s = saveState(obj)
+            s = struct();
+            s.subpaths = obj.subpaths;
+
+            save(obj.filepath, '-struct', 's');
+        end
+    end
+end