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//
// System.Data.Common.DbProviderFactoriesConfigurationHandler.cs
//
// Author:
// Sureshkumar T (tsureshkumar@novell.com)
// Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2003
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.IO;
using System.Xml;
using System.Globalization;
using System.Configuration;
namespace System.Data.Common
{
public class DbProviderFactoriesConfigurationHandler : IConfigurationSectionHandler
{
#region Constructors
public DbProviderFactoriesConfigurationHandler ()
{
}
#endregion // Constructors
#region Methods
public virtual object Create (object parent, object configContext, XmlNode section)
{
DataSet ds = parent as DataSet ?? CreateDataSet ();
FillDataTables (ds, section);
return ds;
}
DataSet CreateDataSet ()
{
DataSet ds = new DataSet (DbProviderFactories.CONFIG_SECTION_NAME);
DataTable dt = ds.Tables.Add (DbProviderFactories.CONFIG_SEC_TABLE_NAME);
DataColumn [] columns = new DataColumn [4];
columns [0] = new DataColumn ("Name", typeof (string));
columns [1] = new DataColumn ("Description", typeof (string));
columns [2] = new DataColumn ("InvariantName", typeof (string));
columns [3] = new DataColumn ("AssemblyQualifiedName", typeof (string));
dt.Columns.AddRange (columns);
dt.PrimaryKey = new DataColumn [] { columns [2] };
return ds;
}
void FillDataTables (DataSet ds, XmlNode section)
{
DataTable dt = ds.Tables [0];
foreach (XmlNode node in section.ChildNodes) {
if (node.NodeType != XmlNodeType.Element)
continue;
if (node.Name == DbProviderFactories.CONFIG_SEC_TABLE_NAME) {
foreach (XmlNode factoryNode in node.ChildNodes) {
if (factoryNode.NodeType != XmlNodeType.Element)
continue;
switch (factoryNode.Name) {
case "add":
AddRow (dt, factoryNode);
break;
case "clear":
dt.Rows.Clear ();
break;
case "remove":
RemoveRow (dt, factoryNode);
break;
default:
throw new ConfigurationErrorsException (
"Unrecognized element.", factoryNode);
}
}
}
}
}
string GetAttributeValue (XmlNode node, string name, bool required)
{
XmlAttribute attr = node.Attributes [name];
if (attr == null) {
if (!required)
return null;
throw new ConfigurationErrorsException ("Required Attribute '"
+ name + "' is missing!", node);
}
string value = attr.Value;
if (value == "")
throw new ConfigurationException ("Attribute '" + name
+ "' cannot be empty!", node);
return value;
}
void AddRow (DataTable dt, XmlNode addNode)
{
string name = GetAttributeValue (addNode, "name", true);
string description = GetAttributeValue (addNode, "description", true);
string invariant = GetAttributeValue (addNode, "invariant", true);
string type = GetAttributeValue (addNode, "type", true);
// FIXME: throw ConfigurationErrorsException for unrecognized
// attributes. Consider "supports" valid although we're not using
// it
DataRow row = dt.NewRow ();
row [0] = name;
row [1] = description;
row [2] = invariant;
row [3] = type;
dt.Rows.Add (row);
}
void RemoveRow (DataTable dt, XmlNode removeNode)
{
// FIXME: throw ConfigurationErrorsException for unrecognized
// attributes.
string invariant = GetAttributeValue (removeNode, "invariant", true);
DataRow row = dt.Rows.Find (invariant);
if (row != null)
row.Delete ();
}
#endregion // Methods
}
}
#endif // NET_2_0
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