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

   1 //------------------------------------------------------------------------------
   2 // <copyright file="CopyOfAction.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     using MS.Internal.Xml.XPath;
  15
  16     internal class CopyOfAction : CompiledAction {
  17         private const int ResultStored  = 2;
  18         private const int NodeSetCopied = 3;
  19
  20         private int    selectKey   = Compiler.InvalidQueryKey;
  21
  22         internal override void Compile(Compiler compiler) {
  23             CompileAttributes(compiler);
  24             CheckRequiredAttribute(compiler, selectKey != Compiler.InvalidQueryKey, "select");
  25             CheckEmpty(compiler);
  26         }
  27
  28         internal override bool CompileAttribute(Compiler compiler) {
  29             string name   = compiler.Input.LocalName;
  30             string value  = compiler.Input.Value;
  31             if (Ref.Equal(name, compiler.Atoms.Select)) {
  32                 this.selectKey = compiler.AddQuery(value);
  33             }
  34             else {
  35                 return false;
  36             }
  37
  38             return true;
  39         }
  40
  41         internal override void Execute(Processor processor, ActionFrame frame) {
  42             Debug.Assert(processor != null && frame != null);
  43
  44             switch (frame.State) {
  45             case Initialized:
  46                 Debug.Assert(frame.NodeSet != null);
  47                 Query query = processor.GetValueQuery(this.selectKey);
  48                 object result = query.Evaluate(frame.NodeSet);
  49
  50                 if (result is XPathNodeIterator) {
  51                     // we cash this query because otherwise current() works incorrectly. Bug#382166.
  52                     // To be perfect we should use frame.NewNodeSet here
  53                     processor.PushActionFrame(CopyNodeSetAction.GetAction(), new XPathArrayIterator(query));
  54                     frame.State = NodeSetCopied;
  55                     break;
  56                 }
  57
  58                 XPathNavigator nav = result as XPathNavigator;
  59                 if (nav != null) {
  60                     processor.PushActionFrame(CopyNodeSetAction.GetAction(), new XPathSingletonIterator(nav));
  61                     frame.State = NodeSetCopied;
  62                     break;
  63                 }
  64
  65                 string value = XmlConvert.ToXPathString(result);
  66                 if (processor.TextEvent(value)) {
  67                     frame.Finished();
  68                 } else {
  69                     frame.StoredOutput = value;
  70                     frame.State        = ResultStored;
  71                 }
  72                 break;
  73
  74             case ResultStored:
  75                 Debug.Assert(frame.StoredOutput != null);
  76                 processor.TextEvent(frame.StoredOutput);
  77                 frame.Finished();
  78                 break;
  79
  80             case NodeSetCopied:
  81                 Debug.Assert(frame.State == NodeSetCopied);
  82                 frame.Finished();
  83                 break;
  84             }
  85         }
  86     }
  87 }