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         public class DbProviderFactoriesConfigurationHandler : IConfigurationSectionHandler
  43         {
  44                 #region Constructors
  45
  46                 public DbProviderFactoriesConfigurationHandler ()
  47                 {
  48                 }
  49
  50                 #endregion // Constructors
  51
  52                 #region Methods
  53
  54                 public virtual object Create (object parent, object configContext, XmlNode section)
  55                 {
  56                         DataSet ds = new DataSet ("DbProviderFactories");
  57                         CreateDataTables (ds, section);
  58                         return ds;
  59                 }
  60
  61                 internal virtual void CreateDataTables (DataSet ds, XmlNode section)
  62                 {
  63                         DataTable dt = ds.Tables.Add ("DbProviderFactories");
  64                         DataColumn [] columns = new DataColumn [5];
  65                         columns [0] = new DataColumn ("Name", typeof (string));
  66                         columns [1] = new DataColumn ("Description", typeof (string));
  67                         columns [2] = new DataColumn ("InvariantName", typeof (string));
  68                         columns [3] = new DataColumn ("AssemblyQualifiedName", typeof (string));
  69                         columns [4] = new DataColumn ("SupportedClasses", typeof (int));
  70                         dt.Columns.AddRange (columns);
  71                         dt.PrimaryKey = new DataColumn [] {columns [2]};
  72
  73                         foreach (XmlNode node in section.SelectNodes (".//DbProviderFactories")) {
  74                                 AddRows (dt, node);
  75                                 RemoveRows (dt, node);
  76                        }
  77                 }
  78
  79                 internal string GetAttributeValue (XmlNode node, string name, bool required)
  80                 {
  81                         XmlAttribute attr = node.Attributes[name];
  82                         if (attr == null) {
  83                                 if (!required)
  84                                         return null;
  85                                 throw new ConfigurationErrorsException ("Required Attribute '" + name +
  86                                                                   "' is  missing!", node);
  87                         }
  88                         string value = attr.Value;
  89                         if (value == "")
  90                                 throw new ConfigurationException ("Attribute '" + name + "' cannot be empty!",
  91                                                                   node);
  92                         return value;
  93                 }
  94
  95                 internal virtual void AddRows (DataTable dt, XmlNode factoriesNode)
  96                 {
  97                         foreach (XmlNode addNode in factoriesNode.SelectNodes (".//add")) {
  98                                 if (addNode.NodeType != XmlNodeType.Element)
  99                                         continue;
 100
 101                                 string name = "";
 102                                 string description = "";
 103                                 string invariant = "";
 104                                 string type = "";
 105                                 string supportedClasses = "";
 106                                 int support = 0;
 107
 108                                 name            = GetAttributeValue (addNode, "name", true);
 109                                 description     = GetAttributeValue (addNode, "description", true);
 110                                 invariant       = GetAttributeValue (addNode, "invariant", true);
 111                                 type            = GetAttributeValue (addNode, "type", true);
 112                                 supportedClasses = GetAttributeValue (addNode, "support", false);
 113                                 if (supportedClasses != null)
 114                                         support = int.Parse (supportedClasses, NumberStyles.HexNumber);
 115
 116                                 DataRow row = dt.NewRow ();
 117                                 row [0] = name;
 118                                 row [1] = description;
 119                                 row [2] = invariant;
 120                                 row [3] = type;
 121                                 if (supportedClasses != null)
 122                                         row [4] = support;
 123
 124                                 dt.Rows.Add (row);
 125                         }
 126                 }
 127
 128                 internal virtual void RemoveRows (DataTable dt, XmlNode removeNode)
 129                 {
 130                         foreach (XmlNode node in removeNode.SelectNodes (".//remove")) {
 131                                 if (node.NodeType != XmlNodeType.Element)
 132                                         continue;
 133
 134                                 string invariant = GetAttributeValue (node, "invariant", true);
 135                                 DataRow row = dt.Rows.Find (invariant);
 136                                 if (row != null)
 137                                         row.Delete ();
 138                         }
 139                 }
 140
 141
 142                 #endregion // Methods
 143         }
 144 }
 145
 146 #endif // NET_2_0