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