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//-----------------------------------------------------------------------
// <copyright file="MessageDictionary.cs" company="Andrew Arnott">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOAuth.Messaging.Reflection {
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
/// <summary>
/// Wraps an <see cref="IProtocolMessage"/> instance in a dictionary that
/// provides access to both well-defined message properties and "extra"
/// name/value pairs that have no properties associated with them.
/// </summary>
internal class MessageDictionary : IDictionary<string, string> {
private IProtocolMessage message;
private MessageDescription description;
internal MessageDictionary(IProtocolMessage message) {
if (message == null) {
throw new ArgumentNullException("message");
}
this.message = message;
this.description = MessageDescription.Get(message.GetType());
}
#region IDictionary<string,string> Members
public void Add(string key, string value) {
if (value == null) {
throw new ArgumentNullException("value");
}
MessagePart part;
if (this.description.Mapping.TryGetValue(key, out part)) {
if (part.IsNondefaultValueSet(this.message)) {
throw new ArgumentException(MessagingStrings.KeyAlreadyExists);
}
part.SetValue(this.message, value);
} else {
this.message.ExtraData.Add(key, value);
}
}
public bool ContainsKey(string key) {
return this.message.ExtraData.ContainsKey(key) ||
(this.description.Mapping.ContainsKey(key) && this.description.Mapping[key].GetValue(this.message) != null);
}
public ICollection<string> Keys {
get {
List<string> keys = new List<string>(this.message.ExtraData.Count + this.description.Mapping.Count);
foreach (var pair in this.description.Mapping) {
// Don't include keys with null values, but default values for structs is ok
if (pair.Value.GetValue(this.message) != null) {
keys.Add(pair.Key);
}
}
foreach (string key in this.message.ExtraData.Keys) {
keys.Add(key);
}
return keys.AsReadOnly();
}
}
public bool Remove(string key) {
if (this.message.ExtraData.Remove(key)) {
return true;
} else {
MessagePart part;
if (this.description.Mapping.TryGetValue(key, out part)) {
if (part.GetValue(this.message) != null) {
part.SetValue(this.message, null);
return true;
}
}
return false;
}
}
public bool TryGetValue(string key, out string value) {
MessagePart part;
if (this.description.Mapping.TryGetValue(key, out part)) {
value = part.GetValue(this.message);
return true;
}
return this.message.ExtraData.TryGetValue(key, out value);
}
public ICollection<string> Values {
get {
List<string> values = new List<string>(this.message.ExtraData.Count + this.description.Mapping.Count);
foreach (MessagePart part in this.description.Mapping.Values) {
if (part.GetValue(this.message) != null) {
values.Add(part.GetValue(this.message));
}
}
foreach (string value in this.message.ExtraData.Values) {
Debug.Assert(value != null, "Null values should never be allowed in the extra data dictionary.");
values.Add(value);
}
return values.AsReadOnly();
}
}
public string this[string key] {
get {
MessagePart part;
if (this.description.Mapping.TryGetValue(key, out part)) {
// Never throw KeyNotFoundException for declared properties.
return part.GetValue(this.message);
} else {
return this.message.ExtraData[key];
}
}
set {
MessagePart part;
if (this.description.Mapping.TryGetValue(key, out part)) {
part.SetValue(this.message, value);
} else {
if (value == null) {
this.message.ExtraData.Remove(key);
} else {
this.message.ExtraData[key] = value;
}
}
}
}
#endregion
#region ICollection<KeyValuePair<string,string>> Members
public void Add(KeyValuePair<string, string> item) {
this.Add(item.Key, item.Value);
}
public void Clear() {
foreach (string key in this.Keys) {
this.Remove(key);
}
}
public bool Contains(KeyValuePair<string, string> item) {
MessagePart part;
if (this.description.Mapping.TryGetValue(item.Key, out part)) {
return string.Equals(part.GetValue(this.message), item.Value, StringComparison.Ordinal);
} else {
return this.message.ExtraData.Contains(item);
}
}
void ICollection<KeyValuePair<string, string>>.CopyTo(KeyValuePair<string, string>[] array, int arrayIndex) {
foreach (var pair in (IDictionary<string, string>)this) {
array[arrayIndex++] = pair;
}
}
public int Count {
get { return this.Keys.Count; }
}
bool ICollection<KeyValuePair<string, string>>.IsReadOnly {
get { return false; }
}
public bool Remove(KeyValuePair<string, string> item) {
// We use contains because that checks that the value is equal as well.
if (((ICollection<KeyValuePair<string, string>>)this).Contains(item)) {
((IDictionary<string, string>)this).Remove(item.Key);
return true;
}
return false;
}
#endregion
#region IEnumerable<KeyValuePair<string,string>> Members
public IEnumerator<KeyValuePair<string, string>> GetEnumerator() {
foreach (string key in Keys) {
yield return new KeyValuePair<string, string>(key, this[key]);
}
}
#endregion
#region IEnumerable Members
IEnumerator System.Collections.IEnumerable.GetEnumerator() {
return ((IEnumerable<KeyValuePair<string, string>>)this).GetEnumerator();
}
#endregion
}
}
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