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