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//
// System.Data.Configuration.ObjectNameResolutionSectionHandler.cs
//
// Authors:
// Konstantin Triger <kostat@mainsoft.com>
//
// (C) 2005 Mainsoft Corporation (http://www.mainsoft.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.
//
using System.Collections;
using System.Configuration;
using System.Xml;
namespace System.Data.Configuration {
class ObjectNameResolutionSectionHandler : IConfigurationSectionHandler {
public virtual object Create (object parent, object configContext, XmlNode section) {
if (section.Attributes != null && section.Attributes.Count != 0)
HandlersUtil.ThrowException ("Unrecognized attribute", section);
ObjectNameResolversCollection col = new ObjectNameResolversCollection(parent as ObjectNameResolversCollection);
XmlNodeList resolvers = section.ChildNodes;
foreach (XmlNode child in resolvers) {
XmlNodeType ntype = child.NodeType;
if (ntype == XmlNodeType.Whitespace || ntype == XmlNodeType.Comment)
continue;
if (ntype != XmlNodeType.Element)
HandlersUtil.ThrowException ("Only elements allowed", child);
string dbname = HandlersUtil.ExtractAttributeValue ("dbname", child,false,true);
string match = HandlersUtil.ExtractAttributeValue ("match", child);
string pri = HandlersUtil.ExtractAttributeValue ("priority", child);
ObjectNameResolver resolver = new ObjectNameResolver(dbname, match, int.Parse(pri));
col.Add(resolver);
}
col.Sort();
return col;
}
}
internal sealed class HandlersUtil {
private HandlersUtil () {
}
static internal string ExtractAttributeValue (string attKey, XmlNode node) {
return ExtractAttributeValue (attKey, node, false);
}
static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional) {
return ExtractAttributeValue (attKey, node, optional, false);
}
static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional,
bool allowEmpty) {
if (node.Attributes == null) {
if (optional)
return null;
ThrowException ("Required attribute not found: " + attKey, node);
}
XmlNode att = node.Attributes.RemoveNamedItem (attKey);
if (att == null) {
if (optional)
return null;
ThrowException ("Required attribute not found: " + attKey, node);
}
string value = att.Value;
if (!allowEmpty && value == String.Empty) {
string opt = optional ? "Optional" : "Required";
ThrowException (opt + " attribute is empty: " + attKey, node);
}
return value;
}
static internal void ThrowException (string msg, XmlNode node) {
if (node != null && node.Name != String.Empty)
msg = msg + " (node name: " + node.Name + ") ";
throw new ConfigurationException (msg, node);
}
}
}
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