/// <summary>
/// The on insert.
/// </summary>
/// <param name="key">
/// The key.
/// </param>
/// <param name="value">
/// The value.
/// </param>
protected override void OnInsert([NotNull] object key, [NotNull] object value)
{
CodeContracts.ArgumentNotNull(key, "key");
CodeContracts.ArgumentNotNull(value, "value");
if (this.Dictionary.Keys.Count >= this.m_max)
{
// Purge an item from the cache
DoubleLinkedList.LinkItem tail = this.m_list.TailLink;
if (tail != null)
{
object purgeKey = this.m_linkToKey[tail];
if (purgeKey != null)
{
// Fire the event
if (this.OnPurgedFromCache != null && this.OnPurgedFromCache.GetInvocationList().Length > 0)
{
this.OnPurgedFromCache(purgeKey, tail.Item);
}
this.Remove(purgeKey);
}
}
}
}
/// <summary>
/// The add.
/// </summary>
/// <param name="key">
/// The key.
/// </param>
/// <param name="value">
/// The value.
/// </param>
public void Add([NotNull] object key, [NotNull] object value)
{
CodeContracts.ArgumentNotNull(key, "key");
CodeContracts.ArgumentNotNull(value, "value");
DoubleLinkedList.LinkItem link = this.m_list.Prepend(value);
this.Dictionary.Add(key, link);
// Keep a reverse index from the link to the key
this.m_linkToKey[link] = key;
}
/// <summary>
/// The this.
/// </summary>
/// <param name="key">
/// The key.
/// </param>
public object this[[NotNull] object key]
{
get
{
CodeContracts.ArgumentNotNull(key, "key");
var item = (DoubleLinkedList.LinkItem) this.Dictionary[key];
if (item == null)
{
return(null);
}
this.m_list.MoveToHead(item);
return(item.Item);
}
set
{
CodeContracts.ArgumentNotNull(key, "key");
CodeContracts.ArgumentNotNull(value, "value");
DoubleLinkedList.LinkItem link = null;
if (this.Dictionary.Contains(key))
{
link = (DoubleLinkedList.LinkItem) this.Dictionary[key];
link.Item = value;
this.m_list.MoveToHead(link);
this.Dictionary[key] = link;
// Keep a reverse index from the link to the key
this.m_linkToKey[link] = key;
}
else
{
this.Add(key, value);
}
}
}