mcs/class/referencesource/System.Data.SqlXml/System/Xml/Xsl/XsltOld/CopyNamespacesAction.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="CopyNamespacesAction.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 //------------------------------------------------------------------------------
   7
   8 namespace System.Xml.Xsl.XsltOld {
   9     using Res = System.Xml.Utils.Res;
  10     using System;
  11     using System.Diagnostics;
  12     using System.Xml;
  13     using System.Xml.XPath;
  14
  15     internal sealed class CopyNamespacesAction : Action {
  16         private const int BeginEvent    = 2;
  17         private const int TextEvent     = 3;
  18         private const int EndEvent      = 4;
  19         private const int Advance       = 5;
  20
  21         private static CopyNamespacesAction s_Action = new CopyNamespacesAction();
  22
  23         internal static CopyNamespacesAction GetAction() {
  24             Debug.Assert(s_Action != null);
  25             return s_Action;
  26         }
  27
  28         internal override void Execute(Processor processor, ActionFrame frame) {
  29             Debug.Assert(processor != null && frame != null);
  30
  31             while (processor.CanContinue) {
  32                 switch (frame.State) {
  33                 case Initialized:
  34                     if (frame.Node.MoveToFirstNamespace(XPathNamespaceScope.ExcludeXml) == false) {
  35                         frame.Finished();
  36                         break;
  37                     }
  38
  39                     frame.State   = BeginEvent;
  40                     goto case BeginEvent;
  41
  42                 case BeginEvent:
  43                     Debug.Assert(frame.State == BeginEvent);
  44                     Debug.Assert(frame.Node.NodeType == XPathNodeType.Namespace);
  45
  46                     if (processor.BeginEvent(XPathNodeType.Namespace, null, frame.Node.LocalName, frame.Node.Value, false) == false) {
  47                         // This one wasn't output
  48                         break;
  49                     }
  50                     frame.State = EndEvent;
  51                     continue;
  52
  53                 case EndEvent:
  54                     Debug.Assert(frame.State == EndEvent);
  55                     Debug.Assert(frame.Node.NodeType == XPathNodeType.Namespace);
  56
  57                     if (processor.EndEvent(XPathNodeType.Namespace) == false) {
  58                         // This one wasn't output
  59                         break;
  60                     }
  61                     frame.State = Advance;
  62                     continue;
  63
  64                 case Advance:
  65                     Debug.Assert(frame.State == Advance);
  66                     Debug.Assert(frame.Node.NodeType == XPathNodeType.Namespace);
  67
  68                     if (frame.Node.MoveToNextNamespace(XPathNamespaceScope.ExcludeXml)) {
  69                         frame.State = BeginEvent;
  70                         continue;
  71                     }
  72                     else {
  73                         frame.Node.MoveToParent();
  74                         frame.Finished();
  75                         break;
  76                     }
  77                 }
  78                 break;
  79             }// while
  80         }
  81     }
  82 }