settings helper

Author: EleonoraPetzold

Helper/Settings.cs

@@ -0,0 +1,132 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Xml;
+using System.Xml.Linq;
+using Vaiona.Utils.Cfg;
+
+namespace BExIS.Modules.EMM.UI.Helper
+{
+    static class Settings
+    {
+
+        private static String filePath = Path.Combine(AppConfiguration.GetModuleWorkspacePath("EMM"), "Emm.settings.xml");
+        private static Dictionary<string, object> settings = new Dictionary<string, object>();
+
+        /// <summary>
+        /// setup settings model
+        /// * load settings from settings.xml
+        /// </summary>
+        static Settings()
+        {
+            // intial loading of settings
+            reloadSettings();
+
+            // set up file watcher to listen for changes
+            using (FileSystemWatcher fw = new FileSystemWatcher())
+            {
+                fw.Path = Path.GetDirectoryName(filePath);
+                fw.Filter = Path.GetFileName(filePath);
+                fw.Changed += new FileSystemEventHandler(fw_Changed);
+                fw.EnableRaisingEvents = true;
+            }
+
+        }
+
+        /// <summary>
+        /// retrieve a value from the settings file
+        /// </summary>
+        /// <param name="key">the key for the parameter</param>
+        /// <returns>the respective value</returns>
+        public static object get(String key)
+        {
+            if (settings.ContainsKey(key))
+            {
+                return settings[key];
+            }
+            else
+            {
+                return null;
+            }
+        }
+
+        /// <summary>
+        /// add or change an entry in the settings
+        /// TODO persist changes in workflow file
+        /// </summary>
+        /// <param name="key"></param>
+        /// <param name="value"></param>
+        public static void set(String key, object value)
+        {
+            if (settings.ContainsKey(key))
+            {
+                settings[key] = value;
+            }
+            else
+            {
+                settings.Add(key, value);
+            }
+        }
+
+        /// <summary>
+        /// Handler to listen for changes in settings file
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private static void fw_Changed(object sender, FileSystemEventArgs e)
+        {
+            reloadSettings();
+        }
+
+        /// <summary>
+        /// load settings anew from settings.xml
+        /// </summary>
+        private static void reloadSettings()
+        {
+            // get XML data
+            XDocument xDoc = XDocument.Load(filePath);
+            XmlDocument xmlDoc = new XmlDocument();
+            xmlDoc.Load(xDoc.CreateReader());
+
+            // empty old settings list
+            settings.Clear();
+
+            // parse values
+            foreach (XmlNode node in xmlDoc.SelectNodes("//settings/entry"))
+            {
+                // shortcuts
+                var key = node.Attributes["key"] != null ? node.Attributes["key"].Value : null;
+                var value = node.Attributes["value"] != null ? node.Attributes["value"].Value : null;
+                var type = node.Attributes["type"] != null ? node.Attributes["type"].Value : null;
+
+                // only parse valid entries
+                if ((null == key) || (null == value))
+                {
+                    continue;
+                }
+
+                // convert types
+                switch (type)
+                {
+                    case "int":
+                        int intVal;
+                        if (Int32.TryParse(value, out intVal))
+                        {
+                            settings.Add(key, intVal);
+                        }
+                        else
+                        {
+                            settings.Add(key, value);
+                        }
+                        break;
+
+                    // default is string
+                    default:
+                        settings.Add(key, value);
+                        break;
+                }
+            }
+        }
+
+    }
+}