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

   1 //------------------------------------------------------------------------------
   2 // <copyright file="CopyNodeSetAction.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">[....]</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 CopyNodeSetAction : Action {
  16         private const int BeginEvent    = 2;
  17         private const int Contents      = 3;
  18         private const int Namespaces    = 4;
  19         private const int Attributes    = 5;
  20         private const int Subtree       = 6;
  21         private const int EndEvent      = 7;
  22
  23         private static CopyNodeSetAction s_Action = new CopyNodeSetAction();
  24
  25         internal static CopyNodeSetAction GetAction() {
  26             Debug.Assert(s_Action != null);
  27             return s_Action;
  28         }
  29
  30         internal override void Execute(Processor processor, ActionFrame frame) {
  31             Debug.Assert(processor != null && frame != null);
  32             while (processor.CanContinue) {
  33                 switch (frame.State) {
  34                 case Initialized:
  35                     if (frame.NextNode(processor)) {
  36                         frame.State = BeginEvent;
  37                         goto case BeginEvent;
  38                     }
  39                     else {
  40                         frame.Finished();
  41                         break;
  42                     }
  43                 case BeginEvent:
  44                     Debug.Assert(frame.State == BeginEvent);
  45
  46                     if (SendBeginEvent(processor, frame.Node) == false) {
  47                         // This one wasn't output
  48                         break;
  49                     }
  50                     frame.State = Contents;
  51                     continue;
  52
  53                 case Contents:
  54                     Debug.Assert(frame.State == Contents);
  55                     XPathNodeType nodeType = frame.Node.NodeType;
  56
  57                     if (nodeType == XPathNodeType.Element || nodeType == XPathNodeType.Root) {
  58                         processor.PushActionFrame(CopyNamespacesAction.GetAction(), frame.NodeSet);
  59                         frame.State = Namespaces;
  60                         break;
  61                     }
  62
  63                     if (SendTextEvent(processor, frame.Node) == false) {
  64                         // This one wasn't output
  65                         break;
  66                     }
  67                     frame.State = EndEvent;
  68                     continue;
  69
  70                 case Namespaces:
  71                     processor.PushActionFrame(CopyAttributesAction.GetAction(), frame.NodeSet);
  72                     frame.State = Attributes;
  73                     break;
  74
  75                 case Attributes:
  76                     if (frame.Node.HasChildren) {
  77                         processor.PushActionFrame(GetAction(), frame.Node.SelectChildren(XPathNodeType.All));
  78                         frame.State = Subtree;
  79                         break;
  80                     }
  81                     frame.State = EndEvent;
  82                     goto case EndEvent;
  83
  84                 case Subtree:
  85                     //frame.Node.MoveToParent();
  86                     frame.State = EndEvent;
  87                     continue;
  88
  89                 case EndEvent:
  90                     Debug.Assert(frame.State == EndEvent);
  91
  92                     if (SendEndEvent(processor, frame.Node) == false) {
  93                         // This one wasn't output
  94                         break;
  95                     }
  96
  97                     frame.State = Initialized;
  98                     continue;
  99                 }
 100
 101                 break;
 102             }
 103         }
 104
 105         private static bool SendBeginEvent(Processor processor, XPathNavigator node) {
 106             return processor.CopyBeginEvent(node, node.IsEmptyElement);
 107         }
 108
 109         private static bool SendTextEvent(Processor processor, XPathNavigator node) {
 110             return processor.CopyTextEvent(node);
 111         }
 112
 113         private static bool SendEndEvent(Processor processor, XPathNavigator node) {
 114             return processor.CopyEndEvent(node);
 115         }
 116     }
 117 }