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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
namespace Newtonsoft.Json.Linq
{
internal class JPropertyKeyedCollection : Collection<JToken>
{
private static readonly IEqualityComparer<string> Comparer = StringComparer.Ordinal;
private Dictionary<string, JToken> _dictionary;
private void AddKey(string key, JToken item)
{
EnsureDictionary();
_dictionary[key] = item;
}
protected void ChangeItemKey(JToken item, string newKey)
{
if (!ContainsItem(item))
throw new ArgumentException("The specified item does not exist in this KeyedCollection.");
string keyForItem = GetKeyForItem(item);
if (!Comparer.Equals(keyForItem, newKey))
{
if (newKey != null)
AddKey(newKey, item);
if (keyForItem != null)
RemoveKey(keyForItem);
}
}
protected override void ClearItems()
{
base.ClearItems();
if (_dictionary != null)
_dictionary.Clear();
}
public bool Contains(string key)
{
if (key == null)
throw new ArgumentNullException("key");
if (_dictionary != null)
return _dictionary.ContainsKey(key);
return false;
}
private bool ContainsItem(JToken item)
{
if (_dictionary == null)
return false;
string key = GetKeyForItem(item);
JToken value;
return _dictionary.TryGetValue(key, out value);
}
private void EnsureDictionary()
{
if (_dictionary == null)
_dictionary = new Dictionary<string, JToken>(Comparer);
}
private string GetKeyForItem(JToken item)
{
return ((JProperty)item).Name;
}
protected override void InsertItem(int index, JToken item)
{
AddKey(GetKeyForItem(item), item);
base.InsertItem(index, item);
}
public bool Remove(string key)
{
if (key == null)
throw new ArgumentNullException("key");
if (_dictionary != null)
return _dictionary.ContainsKey(key) && Remove(_dictionary[key]);
return false;
}
protected override void RemoveItem(int index)
{
string keyForItem = GetKeyForItem(Items[index]);
RemoveKey(keyForItem);
base.RemoveItem(index);
}
private void RemoveKey(string key)
{
if (_dictionary != null)
_dictionary.Remove(key);
}
protected override void SetItem(int index, JToken item)
{
string keyForItem = GetKeyForItem(item);
string keyAtIndex = GetKeyForItem(Items[index]);
if (Comparer.Equals(keyAtIndex, keyForItem))
{
if (_dictionary != null)
_dictionary[keyForItem] = item;
}
else
{
AddKey(keyForItem, item);
if (keyAtIndex != null)
RemoveKey(keyAtIndex);
}
base.SetItem(index, item);
}
public JToken this[string key]
{
get
{
if (key == null)
throw new ArgumentNullException("key");
if (_dictionary != null)
return _dictionary[key];
throw new KeyNotFoundException();
}
}
public bool TryGetValue(string key, out JToken value)
{
if (_dictionary == null)
{
value = null;
return false;
}
return _dictionary.TryGetValue(key, out value);
}
public ICollection<string> Keys
{
get
{
EnsureDictionary();
return _dictionary.Keys;
}
}
public ICollection<JToken> Values
{
get
{
EnsureDictionary();
return _dictionary.Values;
}
}
}
}
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