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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
namespace OpenSim.Framework
{
/// <summary>
/// Undo stack. Deletes entries beyond a certain capacity
/// </summary>
/// <typeparam name="T"></typeparam>
[Serializable]
public class UndoStack<T>
{
private List<T> m_undolist;
private int m_max;
public UndoStack(int capacity)
{
m_undolist = new List<T>();
m_max = capacity;
}
public bool IsFull
{
get { return m_undolist.Count >= m_max; }
}
public int Capacity
{
get { return m_max; }
}
public int Count
{
get
{
return m_undolist.Count;
}
}
public void Push(T item)
{
if (IsFull)
{
m_undolist.RemoveAt(0);
}
m_undolist.Add(item);
}
public T Pop()
{
if (m_undolist.Count > 0)
{
int ind = m_undolist.Count - 1;
T item = m_undolist[ind];
m_undolist.RemoveAt(ind);
return item;
}
else
throw new InvalidOperationException("Cannot pop from empty stack");
}
public T Peek()
{
if (m_undolist.Count > 0)
{
return m_undolist[m_undolist.Count - 1];
}
else
{
return default(T);
}
}
public void Clear()
{
m_undolist.Clear();
}
}
}
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