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//
// System.ComponentModel.Design.Serialization.ContextStack.cs
//
// Author:
// Alejandro Sánchez Acosta (raciel@gnome.org)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//
// (C) Alejandro Sánchez Acosta
// (C) 2003 Andreas Nahr
//
//
// 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.Collections;
namespace System.ComponentModel.Design.Serialization
{
public sealed class ContextStack
{
private Stack stack;
public ContextStack ()
{
stack = new Stack ();
}
public object Current {
get {
try {
return stack.Peek ();
}
catch {
return null;
}
}
}
public object this[Type type] {
get {
foreach (object o in stack.ToArray())
if (o.GetType () == type)
return o;
return null;
}
}
public object this[int level] {
get {
if (level < 0)
throw new ArgumentException ("level has to be >= 0","level");
Array A = stack.ToArray();
if (level > (A.Length - 1))
return null;
return A.GetValue(level);
}
}
public object Pop ()
{
return stack.Pop ();
}
public void Push (object context)
{
stack.Push (context);
}
}
}
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