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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.IdentityModel
{
using System.Xml;
using System.Collections.Generic;
class IdentityModelDictionary : IXmlDictionary
{
static public readonly IdentityModelDictionary Version1 = new IdentityModelDictionary(new IdentityModelStringsVersion1());
IdentityModelStrings strings;
int count;
XmlDictionaryString[] dictionaryStrings;
Dictionary<string, int> dictionary;
XmlDictionaryString[] versionedDictionaryStrings;
public IdentityModelDictionary(IdentityModelStrings strings)
{
this.strings = strings;
this.count = strings.Count;
}
static public IdentityModelDictionary CurrentVersion
{
get
{
return Version1;
}
}
public XmlDictionaryString CreateString(string value, int key)
{
return new XmlDictionaryString(this, value, key);
}
public bool TryLookup(string key, out XmlDictionaryString value)
{
if (key == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("key"));
if (this.dictionary == null)
{
Dictionary<string, int> dictionary = new Dictionary<string, int>(count);
for (int i = 0; i < count; i++)
dictionary.Add(strings[i], i);
this.dictionary = dictionary;
}
int id;
if (this.dictionary.TryGetValue(key, out id))
return TryLookup(id, out value);
value = null;
return false;
}
public bool TryLookup(int key, out XmlDictionaryString value)
{
if (key < 0 || key >= count)
{
value = null;
return false;
}
if (dictionaryStrings == null)
dictionaryStrings = new XmlDictionaryString[count];
XmlDictionaryString s = dictionaryStrings[key];
if (s == null)
{
s = CreateString(strings[key], key);
dictionaryStrings[key] = s;
}
value = s;
return true;
}
public bool TryLookup(XmlDictionaryString key, out XmlDictionaryString value)
{
if (key == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("key"));
if (key.Dictionary == this)
{
value = key;
return true;
}
if (key.Dictionary == CurrentVersion)
{
if (versionedDictionaryStrings == null)
versionedDictionaryStrings = new XmlDictionaryString[CurrentVersion.count];
XmlDictionaryString s = versionedDictionaryStrings[key.Key];
if (s == null)
{
if (!TryLookup(key.Value, out s))
{
value = null;
return false;
}
versionedDictionaryStrings[key.Key] = s;
}
value = s;
return true;
}
value = null;
return false;
}
}
}
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