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using System;
using System.Collections;
using System.Collections.Generic;
namespace UNEB.Utility
{
/// <summary>
/// A simple stack with a limited capacity.
/// In order to make more room, the first element (not the top) in the stack is removed.
/// </summary>
/// <typeparam name="T"></typeparam>
public class FiniteStack<T> : IEnumerable<T>
{
private LinkedList<T> _container;
private int _capacity;
/// <summary>
/// Called when the stack runs out of space and removes
/// the first item (bottom of stack) to make room.
/// </summary>
public event Action<T> OnRemoveBottomItem;
public FiniteStack(int capacity)
{
_container = new LinkedList<T>();
_capacity = capacity;
}
public void Push(T value)
{
_container.AddLast(value);
// Out of room, remove the first element in the stack.
if (_container.Count == _capacity) {
T first = _container.First.Value;
_container.RemoveFirst();
if (OnRemoveBottomItem != null)
OnRemoveBottomItem(first);
}
}
public T Peek()
{
return _container.Last.Value;
}
public T Pop()
{
var lastVal = _container.Last.Value;
_container.RemoveLast();
return lastVal;
}
public void Clear()
{
_container.Clear();
}
public int Count
{
get { return _container.Count; }
}
public IEnumerator<T> GetEnumerator()
{
return _container.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return _container.GetEnumerator();
}
}
}
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