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//
// System.Collections.Specialized.HybridDictionary.cs
//
// Author:
// Lawrence Pit (loz@cable.a2000.nl)
//
using System;
using System.Collections;
namespace System.Collections.Specialized {
[Serializable]
public class HybridDictionary : IDictionary, ICollection, IEnumerable {
private const int switchAfter = 10;
private ListDictionary list;
private Hashtable hashtable;
private bool caseInsensitive = false;
// Constructors
public HybridDictionary() : this (0, false) { }
public HybridDictionary (bool caseInsensitive) : this (0, caseInsensitive) { }
public HybridDictionary (int initialSize) : this (initialSize, false) { }
public HybridDictionary(int initialSize, bool caseInsensitive)
{
this.caseInsensitive = caseInsensitive;
if (initialSize <= switchAfter)
if (caseInsensitive)
list = new ListDictionary (CaseInsensitiveComparer.Default);
else
list = new ListDictionary ();
else
if (caseInsensitive)
hashtable = new Hashtable (initialSize,
CaseInsensitiveHashCodeProvider.Default,
CaseInsensitiveComparer.Default);
else
hashtable = new Hashtable (initialSize);
}
// Properties
public int Count {
get {
if (list != null)
return list.Count;
return hashtable.Count;
}
}
public bool IsFixedSize {
get { return false; }
}
public bool IsReadOnly {
get { return false; }
}
public bool IsSynchronized {
get { return false; }
}
public object this [object key] {
get {
if (key == null)
throw new ArgumentNullException("key");
if (list != null)
return list [key];
return hashtable [key];
}
set {
if (list != null)
if (list.Count >= switchAfter)
Switch ();
else {
list [key] = value;
return;
}
hashtable [key] = value;
}
}
public ICollection Keys {
get {
if (list != null)
return list.Keys;
return hashtable.Keys;
}
}
public object SyncRoot {
get { return this; }
}
public ICollection Values {
get {
if (list != null)
return list.Values;
return hashtable.Values;
}
}
// Methods
public void Add (object key, object value)
{
if (list != null)
if (list.Count >= switchAfter)
Switch ();
else {
list.Add (key, value);
return;
}
hashtable.Add (key, value);
}
public void Clear ()
{
if (caseInsensitive)
list = new ListDictionary (CaseInsensitiveComparer.Default);
else
list = new ListDictionary ();
hashtable = null;
}
public bool Contains (object key)
{
if (list != null)
return list.Contains (key);
return hashtable.Contains (key);
}
public void CopyTo (Array array, int index)
{
if (list != null)
list.CopyTo (array, index);
else
hashtable.CopyTo (array, index);
}
public IDictionaryEnumerator GetEnumerator ()
{
if (list != null)
return list.GetEnumerator ();
return hashtable.GetEnumerator ();
}
IEnumerator IEnumerable.GetEnumerator ()
{
return GetEnumerator ();
}
public void Remove (object key)
{
if (list != null)
list.Remove (key);
hashtable.Remove (key);
}
private void Switch ()
{
if (caseInsensitive)
hashtable = new Hashtable (switchAfter + 1,
CaseInsensitiveHashCodeProvider.Default,
CaseInsensitiveComparer.Default);
else
hashtable = new Hashtable (switchAfter + 1);
IDictionaryEnumerator e = list.GetEnumerator ();
while (e.MoveNext ())
hashtable.Add (e.Key, e.Value);
list = null;
}
}
}
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