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