mcs/class/System.Data/System.Data.Configuration.jvm/ObjectNameResolutionSectionHandler.cs

   1 using System.Collections;\r
   2 using System.Configuration;\r
   3 using System.Xml;\r
   4 \r
   5 namespace System.Data.Configuration {\r
   6         class ObjectNameResolutionSectionHandler : IConfigurationSectionHandler {\r
   7                 public virtual object Create (object parent, object configContext, XmlNode section) {\r
   8                         if (section.Attributes != null && section.Attributes.Count != 0)\r
   9                                 HandlersUtil.ThrowException ("Unrecognized attribute", section);\r
  10 \r
  11                         ObjectNameResolversCollection col = new ObjectNameResolversCollection(parent as ObjectNameResolversCollection);\r
  12 \r
  13                         XmlNodeList resolvers = section.ChildNodes;\r
  14                         foreach (XmlNode child in resolvers) {\r
  15                                 XmlNodeType ntype = child.NodeType;\r
  16                                 if (ntype == XmlNodeType.Whitespace || ntype == XmlNodeType.Comment)\r
  17                                         continue;\r
  18 \r
  19                                 if (ntype != XmlNodeType.Element)\r
  20                                         HandlersUtil.ThrowException ("Only elements allowed", child);\r
  21 \r
  22                                 string dbname = HandlersUtil.ExtractAttributeValue ("dbname", child,false,true);\r
  23                                 string match = HandlersUtil.ExtractAttributeValue ("match", child);\r
  24                                 string pri = HandlersUtil.ExtractAttributeValue ("priority", child);\r
  25 \r
  26                                 ObjectNameResolver resolver = new ObjectNameResolver(dbname, match, int.Parse(pri));\r
  27                                 col.Add(resolver);\r
  28                         }\r
  29 \r
  30                         col.Sort();\r
  31                         \r
  32                         return col;\r
  33                 }\r
  34         }\r
  35 \r
  36         internal sealed class HandlersUtil {\r
  37                 private HandlersUtil () {\r
  38                 }\r
  39 \r
  40                 static internal string ExtractAttributeValue (string attKey, XmlNode node) {\r
  41                         return ExtractAttributeValue (attKey, node, false);\r
  42                 }\r
  43                         \r
  44                 static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional) {\r
  45                         return ExtractAttributeValue (attKey, node, optional, false);\r
  46                 }\r
  47                 \r
  48                 static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional,\r
  49                         bool allowEmpty) {\r
  50                         if (node.Attributes == null) {\r
  51                                 if (optional)\r
  52                                         return null;\r
  53 \r
  54                                 ThrowException ("Required attribute not found: " + attKey, node);\r
  55                         }\r
  56 \r
  57                         XmlNode att = node.Attributes.RemoveNamedItem (attKey);\r
  58                         if (att == null) {\r
  59                                 if (optional)\r
  60                                         return null;\r
  61                                 ThrowException ("Required attribute not found: " + attKey, node);\r
  62                         }\r
  63 \r
  64                         string value = att.Value;\r
  65                         if (!allowEmpty && value == String.Empty) {\r
  66                                 string opt = optional ? "Optional" : "Required";\r
  67                                 ThrowException (opt + " attribute is empty: " + attKey, node);\r
  68                         }\r
  69 \r
  70                         return value;\r
  71                 }\r
  72 \r
  73                 static internal void ThrowException (string msg, XmlNode node) {\r
  74                         if (node != null && node.Name != String.Empty)\r
  75                                 msg = msg + " (node name: " + node.Name + ") ";\r
  76                         throw new ConfigurationException (msg, node);\r
  77                 }\r
  78         }\r
  79 }