mcs/class/referencesource/System.Xml/System/Xml/XPath/Internal/XPathArrayIterator.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="XPathArrayIterator.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 //------------------------------------------------------------------------------
   7
   8 using System;
   9 using System.Collections;
  10 using System.Diagnostics;
  11 using System.Text;
  12 using System.Xml;
  13 using System.Xml.XPath;
  14
  15 namespace MS.Internal.Xml.XPath {
  16
  17     [DebuggerDisplay("Position={CurrentPosition}, Current={debuggerDisplayProxy, nq}")]
  18     internal class XPathArrayIterator : ResetableIterator {
  19         protected IList     list;
  20         protected int       index;
  21
  22         public XPathArrayIterator(IList list) {
  23             this.list = list;
  24         }
  25
  26         public XPathArrayIterator(XPathArrayIterator it) {
  27             this.list = it.list;
  28             this.index = it.index;
  29         }
  30
  31         public XPathArrayIterator(XPathNodeIterator nodeIterator) {
  32             this.list = new ArrayList();
  33             while (nodeIterator.MoveNext()) {
  34                 this.list.Add(nodeIterator.Current.Clone());
  35             }
  36         }
  37
  38         public IList AsList {
  39             get { return this.list; }
  40         }
  41
  42         public override XPathNodeIterator Clone() {
  43             return new XPathArrayIterator(this);
  44         }
  45
  46         public override XPathNavigator Current {
  47             get {
  48                 Debug.Assert(index <= list.Count);
  49
  50                 if (index < 1) {
  51                     throw new InvalidOperationException(Res.GetString(Res.Sch_EnumNotStarted, string.Empty));
  52                 }
  53                 return (XPathNavigator) list[index - 1];
  54             }
  55         }
  56
  57         public override int CurrentPosition { get { return index; } }
  58         public override int Count           { get { return list.Count; } }
  59
  60         public override bool MoveNext() {
  61             Debug.Assert(index <= list.Count);
  62             if (index == list.Count) {
  63                 return false;
  64             }
  65             index++;
  66             return true;
  67         }
  68
  69         public override void Reset() {
  70             index = 0;
  71         }
  72
  73         public override IEnumerator GetEnumerator() {
  74             return list.GetEnumerator();
  75         }
  76
  77         private object debuggerDisplayProxy { get { return index < 1 ? null : (object)new XPathNavigator.DebuggerDisplayProxy(Current); } }
  78     }
  79 }