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using System;
using System.Collections;
namespace Org.BouncyCastle.Utilities.Collections
{
public class LinkedDictionary
: IDictionary
{
internal readonly IDictionary hash = Platform.CreateHashtable();
internal readonly IList keys = Platform.CreateArrayList();
public LinkedDictionary()
{
}
public virtual void Add(object k, object v)
{
hash.Add(k, v);
keys.Add(k);
}
public virtual void Clear()
{
hash.Clear();
keys.Clear();
}
public virtual bool Contains(object k)
{
return hash.Contains(k);
}
public virtual void CopyTo(Array array, int index)
{
foreach (object k in keys)
{
array.SetValue(hash[k], index++);
}
}
public virtual int Count
{
get { return hash.Count; }
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public virtual IDictionaryEnumerator GetEnumerator()
{
return new LinkedDictionaryEnumerator(this);
}
public virtual void Remove(object k)
{
hash.Remove(k);
keys.Remove(k);
}
public virtual bool IsFixedSize
{
get { return false; }
}
public virtual bool IsReadOnly
{
get { return false; }
}
public virtual bool IsSynchronized
{
get { return false; }
}
public virtual object SyncRoot
{
get { return false; }
}
public virtual ICollection Keys
{
get { return Platform.CreateArrayList(keys); }
}
public virtual ICollection Values
{
// NB: Order has to be the same as for Keys property
get
{
IList values = Platform.CreateArrayList(keys.Count);
foreach (object k in keys)
{
values.Add(hash[k]);
}
return values;
}
}
public virtual object this[object k]
{
get
{
return hash[k];
}
set
{
if (!hash.Contains(k))
keys.Add(k);
hash[k] = value;
}
}
}
internal class LinkedDictionaryEnumerator : IDictionaryEnumerator
{
private readonly LinkedDictionary parent;
private int pos = -1;
internal LinkedDictionaryEnumerator(LinkedDictionary parent)
{
this.parent = parent;
}
public virtual object Current
{
get { return Entry; }
}
public virtual DictionaryEntry Entry
{
get
{
object k = CurrentKey;
return new DictionaryEntry(k, parent.hash[k]);
}
}
public virtual object Key
{
get
{
return CurrentKey;
}
}
public virtual bool MoveNext()
{
if (pos >= parent.keys.Count)
return false;
return ++pos < parent.keys.Count;
}
public virtual void Reset()
{
this.pos = -1;
}
public virtual object Value
{
get
{
return parent.hash[CurrentKey];
}
}
private object CurrentKey
{
get
{
if (pos < 0 || pos >= parent.keys.Count)
throw new InvalidOperationException();
return parent.keys[pos];
}
}
}
}
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