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//------------------------------------------------------------------------------
// <copyright file="DictionarySectionHandler.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Configuration {
using System.Collections;
using System.Collections.Specialized;
using System.Xml;
using System.Globalization;
/// <devdoc>
/// Simple dictionary config factory
/// config is a dictionary mapping key->value
///
/// <add key="name" value="text"> sets key=text
/// <remove key="name"> removes the definition of key
/// <clear> removes all definitions
///
/// </devdoc>
public class DictionarySectionHandler : IConfigurationSectionHandler {
/// <devdoc>
/// Given a partially composed config object (possibly null)
/// and some input from the config system, return a
/// further partially composed config object
/// </devdoc>
public virtual object Create(Object parent, Object context, XmlNode section) {
Hashtable res;
// start res off as a shallow clone of the parent
if (parent == null)
res = new Hashtable(StringComparer.OrdinalIgnoreCase);
else
res = (Hashtable)((Hashtable)parent).Clone();
// process XML
HandlerBase.CheckForUnrecognizedAttributes(section);
foreach (XmlNode child in section.ChildNodes) {
// skip whitespace and comments, throws if non-element
if (HandlerBase.IsIgnorableAlsoCheckForNonElement(child))
continue;
// handle <add>, <remove>, <clear> tags
if (child.Name == "add") {
HandlerBase.CheckForChildNodes(child);
String key = HandlerBase.RemoveRequiredAttribute(child, KeyAttributeName);
String value;
if (ValueRequired)
value = HandlerBase.RemoveRequiredAttribute(child, ValueAttributeName);
else
value = HandlerBase.RemoveAttribute(child, ValueAttributeName);
HandlerBase.CheckForUnrecognizedAttributes(child);
if (value == null)
value = "";
res[key] = value;
}
else if (child.Name == "remove") {
HandlerBase.CheckForChildNodes(child);
String key = HandlerBase.RemoveRequiredAttribute(child, KeyAttributeName);
HandlerBase.CheckForUnrecognizedAttributes(child);
res.Remove(key);
}
else if (child.Name.Equals("clear")) {
HandlerBase.CheckForChildNodes(child);
HandlerBase.CheckForUnrecognizedAttributes(child);
res.Clear();
}
else {
HandlerBase.ThrowUnrecognizedElement(child);
}
}
return res;
}
/// <devdoc>
/// Make the name of the key attribute configurable by derived classes.
/// </devdoc>
protected virtual string KeyAttributeName {
get { return "key";}
}
/// <devdoc>
/// Make the name of the value attribute configurable by derived classes.
/// </devdoc>
protected virtual string ValueAttributeName {
get { return "value";}
}
//
internal virtual bool ValueRequired {
get { return false; }
}
}
}
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