mcs/class/System.Data/System.Data.Common/DbProviderFactoriesConfigurationHandler.cs

   1 //
   2 // System.Data.Common.DbProviderFactoriesConfigurationHandler.cs
   3 //
   4 // Author:
   5 //   Sureshkumar T (tsureshkumar@novell.com)
   6 //   Tim Coleman (tim@timcoleman.com)
   7 //
   8 // Copyright (C) Tim Coleman, 2003
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 #if NET_2_0
  35
  36 using System.IO;
  37 using System.Xml;
  38 using System.Globalization;
  39 using System.Configuration;
  40
  41 namespace System.Data.Common
  42 {
  43         public class DbProviderFactoriesConfigurationHandler : IConfigurationSectionHandler
  44         {
  45                 #region Constructors
  46
  47                 public DbProviderFactoriesConfigurationHandler ()
  48                 {
  49                 }
  50
  51                 #endregion // Constructors
  52
  53                 #region Methods
  54
  55                 public virtual object Create (object parent, object configContext, XmlNode section)
  56                 {
  57                         DataSet ds = new DataSet (DbProviderFactories.CONFIG_SECTION_NAME);
  58                         CreateDataTables (ds, section);
  59                         return ds;
  60                 }
  61
  62                 internal virtual void CreateDataTables (DataSet ds, XmlNode section)
  63                 {
  64                         DataTable dt = ds.Tables.Add (DbProviderFactories.CONFIG_SEC_TABLE_NAME);
  65                         DataColumn [] columns = new DataColumn [4];
  66                         columns [0] = new DataColumn ("Name", typeof (string));
  67                         columns [1] = new DataColumn ("Description", typeof (string));
  68                         columns [2] = new DataColumn ("InvariantName", typeof (string));
  69                         columns [3] = new DataColumn ("AssemblyQualifiedName", typeof (string));
  70                         dt.Columns.AddRange (columns);
  71                         dt.PrimaryKey = new DataColumn [] { columns [2] };
  72
  73                         foreach (XmlNode node in section.ChildNodes) {
  74                                 if (node.NodeType != XmlNodeType.Element)
  75                                         continue;
  76
  77                                 if (node.Name == DbProviderFactories.CONFIG_SEC_TABLE_NAME) {
  78                                         foreach (XmlNode factoryNode in node.ChildNodes) {
  79                                                 if (factoryNode.NodeType != XmlNodeType.Element)
  80                                                         continue;
  81
  82                                                 switch (factoryNode.Name) {
  83                                                 case "add":
  84                                                         AddRow (dt, factoryNode);
  85                                                         break;
  86                                                 case "clear":
  87                                                         dt.Rows.Clear ();
  88                                                         break;
  89                                                 case "remove":
  90                                                         RemoveRow (dt, factoryNode);
  91                                                         break;
  92                                                 default:
  93                                                         throw new ConfigurationErrorsException (
  94                                                                 "Unrecognized element.", factoryNode);
  95                                                 }
  96                                         }
  97                                 }
  98                         }
  99                 }
 100
 101                 string GetAttributeValue (XmlNode node, string name, bool required)
 102                 {
 103                         XmlAttribute attr = node.Attributes [name];
 104                         if (attr == null) {
 105                                 if (!required)
 106                                         return null;
 107                                 throw new ConfigurationErrorsException ("Required Attribute '"
 108                                         + name + "' is  missing!", node);
 109                         }
 110                         string value = attr.Value;
 111                         if (value == "")
 112                                 throw new ConfigurationException ("Attribute '" + name
 113                                         + "' cannot be empty!", node);
 114                         return value;
 115                 }
 116
 117                 void AddRow (DataTable dt, XmlNode addNode)
 118                 {
 119                         string name = GetAttributeValue (addNode, "name", true);
 120                         string description = GetAttributeValue (addNode, "description", true);
 121                         string invariant = GetAttributeValue (addNode, "invariant", true);
 122                         string type = GetAttributeValue (addNode, "type", true);
 123
 124                         // FIXME: throw ConfigurationErrorsException for unrecognized
 125                         // attributes. Consider "supports" valid although we're not using
 126                         // it
 127
 128                         DataRow row = dt.NewRow ();
 129                         row [0] = name;
 130                         row [1] = description;
 131                         row [2] = invariant;
 132                         row [3] = type;
 133
 134                         dt.Rows.Add (row);
 135                 }
 136
 137                 void RemoveRow (DataTable dt, XmlNode removeNode)
 138                 {
 139                         // FIXME: throw ConfigurationErrorsException for unrecognized
 140                         // attributes.
 141
 142                         string invariant = GetAttributeValue (removeNode, "invariant", true);
 143                         DataRow row = dt.Rows.Find (invariant);
 144                         if (row != null)
 145                                 row.Delete ();
 146                 }
 147
 148                 #endregion // Methods
 149         }
 150 }
 151
 152 #endif // NET_2_0