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//-----------------------------------------------------------------------
// <copyright file="MessageDescription.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOAuth.Messaging.Reflection {
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Reflection;
/// <summary>
/// A mapping between serialized key names and <see cref="MessagePart"/> instances describing
/// those key/values pairs.
/// </summary>
internal class MessageDescription {
/// <summary>
/// A dictionary of reflected message types and the generated reflection information.
/// </summary>
private static Dictionary<Type, MessageDescription> reflectedMessageTypes = new Dictionary<Type, MessageDescription>();
/// <summary>
/// The type of message this instance was generated from.
/// </summary>
private Type messageType;
/// <summary>
/// A mapping between the serialized key names and their
/// describing <see cref="MessagePart"/> instances.
/// </summary>
private Dictionary<string, MessagePart> mapping;
/// <summary>
/// Initializes a new instance of the <see cref="MessageDescription"/> class.
/// </summary>
/// <param name="messageType">The type of message to reflect over.</param>
private MessageDescription(Type messageType) {
Debug.Assert(messageType != null, "messageType == null");
if (!typeof(IProtocolMessage).IsAssignableFrom(messageType)) {
throw new ArgumentException(string.Format(
CultureInfo.CurrentCulture,
MessagingStrings.UnexpectedType,
typeof(IProtocolMessage),
messageType));
}
this.messageType = messageType;
this.ReflectMessageType();
}
/// <summary>
/// Gets the mapping between the serialized key names and their describing
/// <see cref="MessagePart"/> instances.
/// </summary>
internal IDictionary<string, MessagePart> Mapping {
get { return this.mapping; }
}
/// <summary>
/// Gets a <see cref="MessageDescription"/> instance prepared for the
/// given message type.
/// </summary>
/// <param name="messageType">A type that implements <see cref="IProtocolMessage"/>.</param>
/// <returns>A <see cref="MessageDescription"/> instance.</returns>
internal static MessageDescription Get(Type messageType) {
if (messageType == null) {
throw new ArgumentNullException("messageType");
}
MessageDescription result;
if (!reflectedMessageTypes.TryGetValue(messageType, out result)) {
lock (reflectedMessageTypes) {
if (!reflectedMessageTypes.TryGetValue(messageType, out result)) {
reflectedMessageTypes[messageType] = result = new MessageDescription(messageType);
}
}
}
return result;
}
/// <summary>
/// Reflects over some <see cref="IProtocolMessage"/>-implementing type
/// and prepares to serialize/deserialize instances of that type.
/// </summary>
internal void ReflectMessageType() {
this.mapping = new Dictionary<string, MessagePart>();
Type currentType = this.messageType;
do {
foreach (MemberInfo member in currentType.GetMembers(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly)) {
if (member is PropertyInfo || member is FieldInfo) {
MessagePartAttribute partAttribute = member.GetCustomAttributes(typeof(MessagePartAttribute), true).OfType<MessagePartAttribute>().FirstOrDefault();
if (partAttribute != null) {
MessagePart part = new MessagePart(member, partAttribute);
this.mapping.Add(part.Name, part);
}
}
}
currentType = currentType.BaseType;
} while (currentType != null);
}
/// <summary>
/// Verifies that a given set of keys include all the required parameters
/// for this message type or throws an exception.
/// </summary>
/// <param name="keys">The names of all parameters included in a message.</param>
/// <exception cref="ProtocolException">Thrown when required parts of a message are not in <paramref name="keys"/></exception>
internal void EnsureRequiredMessagePartsArePresent(IEnumerable<string> keys) {
var missingKeys = (from part in Mapping.Values
where part.IsRequired && !keys.Contains(part.Name)
select part.Name).ToArray();
if (missingKeys.Length > 0) {
throw new ProtocolException(
string.Format(
CultureInfo.CurrentCulture,
MessagingStrings.RequiredParametersMissing,
this.messageType.FullName,
string.Join(", ", missingKeys)));
}
}
}
}
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