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//
// System.ComponentModel.Design.Serialization.ContextStack.cs
//
// Author:
// Alejandro Sánchez Acosta (raciel@gnome.org)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
// Ivan N. Zlatev (contact@i-nz.net)
//
// (C) Alejandro Sánchez Acosta
// (C) 2003 Andreas Nahr
// (C) 2007 Ivan N. Zlatev
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
namespace System.ComponentModel.Design.Serialization
{
public sealed class ContextStack
{
private ArrayList _contextList;
public ContextStack ()
{
_contextList = new ArrayList ();
}
public object Current {
get {
int context_count = _contextList.Count;
if (context_count > 0)
return _contextList [context_count - 1];
return null;
}
}
public object this[Type type] {
get {
if (type == null)
throw new ArgumentNullException ("type");
for (int i = _contextList.Count - 1; i >= 0; i--) {
object context = _contextList [i];
if (type.IsInstanceOfType (context))
return context;
}
return null;
}
}
public object this[int level] {
get {
if (level < 0)
throw new ArgumentOutOfRangeException ("level");
int context_count = _contextList.Count;
if (context_count > 0 && context_count > level)
return _contextList [context_count - 1 - level];
return null;
}
}
public object Pop ()
{
object o = null;
int context_count = _contextList.Count;
if (context_count > 0) {
int lastItem = context_count - 1;
o = _contextList [lastItem];
_contextList.RemoveAt (lastItem);
}
return o;
}
public void Push (object context)
{
if (context == null)
throw new ArgumentNullException ("context");
_contextList.Add (context);
}
#if NET_2_0
public void Append (object context)
{
if (context == null)
throw new ArgumentNullException ("context");
_contextList.Insert (0, context);
}
#endif
}
}
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