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/*************************************************************************************
Extended WPF Toolkit
Copyright (C) 2007-2013 Xceed Software Inc.
This program is provided to you under the terms of the Microsoft Public
License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license
For more features, controls, and fast professional support,
pick up the Plus Edition at http://xceed.com/wpf_toolkit
Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
***********************************************************************************/
using System;
using System.Collections.Generic;
namespace Xceed.Wpf.AvalonDock.Controls
{
internal class WeakDictionary<K, V> where K : class
{
#region Members
private List<WeakReference> _keys = new List<WeakReference>();
private List<V> _values = new List<V>();
#endregion
#region constructors
public WeakDictionary()
{
}
#endregion
#region Public Methods
public V this[ K key ]
{
get
{
V valueToReturn;
if( !GetValue( key, out valueToReturn ) )
throw new ArgumentException();
return valueToReturn;
}
set
{
SetValue( key, value );
}
}
public bool ContainsKey( K key )
{
CollectGarbage();
return -1 != _keys.FindIndex( k => k.GetValueOrDefault<K>() == key );
}
public void SetValue( K key, V value )
{
CollectGarbage();
int vIndex = _keys.FindIndex( k => k.GetValueOrDefault<K>() == key );
if( vIndex > -1 )
_values[ vIndex ] = value;
else
{
_values.Add( value );
_keys.Add( new WeakReference( key ) );
}
}
public bool GetValue( K key, out V value )
{
CollectGarbage();
int vIndex = _keys.FindIndex( k => k.GetValueOrDefault<K>() == key );
value = default( V );
if( vIndex == -1 )
return false;
value = _values[ vIndex ];
return true;
}
#endregion
#region Private Methods
private void CollectGarbage()
{
int vIndex = 0;
do
{
vIndex = _keys.FindIndex( vIndex, k => !k.IsAlive );
if( vIndex >= 0 )
{
_keys.RemoveAt( vIndex );
_values.RemoveAt( vIndex );
}
}
while( vIndex >= 0 );
}
#endregion
}
}
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