Initial check-in

MediaBrowser.Controller/Xml/XmlExtensions.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Globalization;
+using System.Xml;
+
+namespace MediaBrowser.Controller.Xml
+{
+    public static class XmlExtensions
+    {
+        public static int SafeGetInt32(this XmlNode node)
+        {
+            return SafeGetInt32(node, 0);
+        }
+
+        public static int SafeGetInt32(this XmlNode node, int defaultInt)
+        {
+            if (node != null && node.InnerText.Length > 0)
+            {
+                int rval;
+                if (Int32.TryParse(node.InnerText, out rval))
+                {
+                    return rval;
+                }
+
+            }
+            return defaultInt;
+        }
+
+        private static CultureInfo _usCulture = new CultureInfo("en-US");
+
+        public static float SafeGetSingle(this XmlNode rvalNode, float minValue, float maxValue)
+        {
+            if (rvalNode.InnerText.Length > 0)
+            {
+                float rval;
+                // float.TryParse is local aware, so it can be probamatic, force us culture
+                if (float.TryParse(rvalNode.InnerText, NumberStyles.AllowDecimalPoint, _usCulture, out rval))
+                {
+                    if (rval >= minValue && rval <= maxValue)
+                    {
+                        return rval;
+                    }
+                }
+
+            }
+            return minValue;
+        }
+        
+        public static float SafeGetSingle(this XmlNode doc, string path, float minValue, float maxValue)
+        {
+            XmlNode rvalNode = doc.SelectSingleNode(path);
+            if (rvalNode != null)
+            {
+                rvalNode.SafeGetSingle(minValue, maxValue);
+
+            }
+            return minValue;
+        }
+
+
+        public static string SafeGetString(this XmlNode node)
+        {
+            return SafeGetString(node, null);
+        }
+
+        public static string SafeGetString(this XmlNode node, string defaultValue)
+        {
+            if (node != null && node.InnerText.Length > 0)
+            {
+                return node.InnerText;
+            }
+            return defaultValue;
+        }
+    }
+}