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//-----------------------------------------------------------------------
// <copyright file="DictionaryXmlReader.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOAuth.Messaging {
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
/// <summary>
/// An XmlReader-looking object that actually reads from a dictionary.
/// </summary>
internal class DictionaryXmlReader {
/// <summary>
/// Creates an XmlReader that reads data out of a dictionary instead of XML.
/// </summary>
/// <param name="rootElement">The name of the root XML element.</param>
/// <param name="fields">The dictionary to read data from.</param>
/// <returns>The XmlReader that will read the data out of the given dictionary.</returns>
internal static XmlReader Create(XName rootElement, IDictionary<string, string> fields) {
if (rootElement == null) {
throw new ArgumentNullException("rootElement");
}
if (fields == null) {
throw new ArgumentNullException("fields");
}
return CreateRoundtripReader(rootElement, fields);
}
/// <summary>
/// Creates an <see cref="XmlReader"/> that will read values out of a dictionary.
/// </summary>
/// <param name="rootElement">The surrounding root XML element to generate.</param>
/// <param name="fields">The dictionary to list values from.</param>
/// <returns>The generated <see cref="XmlReader"/>.</returns>
private static XmlReader CreateRoundtripReader(XName rootElement, IDictionary<string, string> fields) {
if (rootElement == null) {
throw new ArgumentNullException("rootElement");
}
MemoryStream stream = new MemoryStream();
XmlWriter writer = XmlWriter.Create(stream);
SerializeDictionaryToXml(writer, rootElement, fields);
writer.Flush();
stream.Seek(0, SeekOrigin.Begin);
// For debugging purposes.
StreamReader sr = new StreamReader(stream);
Trace.WriteLine(sr.ReadToEnd());
stream.Seek(0, SeekOrigin.Begin);
return XmlReader.Create(stream);
}
/// <summary>
/// Writes out the values in a dictionary as XML.
/// </summary>
/// <param name="writer">The <see cref="XmlWriter"/> to write out the XML to.</param>
/// <param name="rootElement">The name of the root element to use to surround the dictionary values.</param>
/// <param name="fields">The dictionary with values to serialize.</param>
private static void SerializeDictionaryToXml(XmlWriter writer, XName rootElement, IDictionary<string, string> fields) {
if (writer == null) {
throw new ArgumentNullException("writer");
}
if (rootElement == null) {
throw new ArgumentNullException("rootElement");
}
if (fields == null) {
throw new ArgumentNullException("fields");
}
writer.WriteStartElement(rootElement.LocalName, rootElement.NamespaceName);
// The elements must be serialized in alphabetical order so the DataContractSerializer will see them.
foreach (var pair in fields.OrderBy(pair => pair.Key, StringComparer.Ordinal)) {
writer.WriteStartElement(pair.Key, rootElement.NamespaceName);
writer.WriteValue(pair.Value);
writer.WriteEndElement();
}
writer.WriteEndElement();
}
}
}
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