// // 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); } } }