Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / tx / System / Transactions / Trace / TraceXPathNavigator.cs / 1305376 / TraceXPathNavigator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Very basic performance-oriented XmlWriter implementation. No validation/encoding is made. // Namespaces are not supported // Minimal formatting support //----------------------------------------------------------------------------- namespace System.Transactions.Diagnostics { using System; using System.Collections.Generic; using System.Globalization; using System.IO; using System.Text; using System.Xml.XPath; using System.Xml; class TraceXPathNavigator : XPathNavigator { ElementNode root = null; ElementNode current = null; bool closed = false; XPathNodeType state = XPathNodeType.Element; class ElementNode { internal ElementNode(string name, string prefix, string xmlns, ElementNode parent) { this.name = name; this.prefix = prefix; this.xmlns = xmlns; this.parent = parent; } internal string name; internal string xmlns; internal string prefix; internal ListchildNodes = new List (); internal ElementNode parent; internal List attributes = new List (); internal TextNode text; internal bool movedToText = false; internal ElementNode MoveToNext() { ElementNode retval = null; if ((this.elementIndex + 1) < this.childNodes.Count) { ++this.elementIndex; retval = this.childNodes[this.elementIndex]; } return retval; } internal bool MoveToFirstAttribute() { this.attributeIndex = 0; return this.attributes.Count > 0; } internal bool MoveToNextAttribute() { bool retval = false; if ((this.attributeIndex + 1) < this.attributes.Count) { ++this.attributeIndex; retval = true; } return retval; } internal void Reset() { this.attributeIndex = 0; this.elementIndex = 0; foreach (ElementNode node in this.childNodes) { node.Reset(); } } internal AttributeNode CurrentAttribute { get { return this.attributes[this.attributeIndex]; } } int attributeIndex = 0; int elementIndex = 0; } class AttributeNode { internal AttributeNode(string name, string prefix, string xmlns, string value) { this.name = name; this.prefix = prefix; this.xmlns = xmlns; this.nodeValue = value; } internal string name; internal string xmlns; internal string prefix; internal string nodeValue; } class TextNode { internal TextNode(string value) { this.nodeValue = value; } internal string nodeValue; } internal void AddElement(string prefix, string name, string xmlns) { ElementNode node = new ElementNode(name, prefix, xmlns, this.current); if (this.closed) { throw new InvalidOperationException(SR.GetString(SR.CannotAddToClosedDocument)); } else { if (this.current == null) { this.root = node; this.current = this.root; } else if (!this.closed) { this.current.childNodes.Add(node); this.current = node; } } } internal void AddText(string value) { if (this.closed) { throw new InvalidOperationException(SR.GetString(SR.CannotAddToClosedDocument)); } if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } else if (this.current.text != null) { throw new InvalidOperationException(SR.GetString(SR.TextNodeAlreadyPopulated)); } else { this.current.text = new TextNode(value); } } internal void AddAttribute(string name, string value, string xmlns, string prefix) { if (this.closed) { throw new InvalidOperationException(SR.GetString(SR.CannotAddToClosedDocument)); } if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } AttributeNode node = new AttributeNode(name, prefix, xmlns, value); this.current.attributes.Add(node); } internal void CloseElement() { if (this.closed) { throw new InvalidOperationException(SR.GetString(SR.DocumentAlreadyClosed)); } else { this.current = this.current.parent; if (this.current == null) { this.closed = true; } } } public override string BaseURI { get { return null; } } public override XPathNavigator Clone() { return this; } public override bool IsEmptyElement { get { bool retval = true; if (this.current != null) { retval = this.current.text != null || this.current.childNodes.Count > 0; } return retval; } } public override bool IsSamePosition(XPathNavigator other) { throw new NotSupportedException(); } public override string LocalName { get { return this.Name; } } public override bool MoveTo(XPathNavigator other) { throw new NotSupportedException(); } public override bool MoveToFirstAttribute() { if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } bool retval = this.current.MoveToFirstAttribute(); if (retval) { this.state = XPathNodeType.Attribute; } return retval; } public override bool MoveToFirstChild() { if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } bool retval = false; if (this.current.childNodes.Count > 0) { this.current = this.current.childNodes[0]; this.state = XPathNodeType.Element; retval = true; } else if (this.current.childNodes.Count == 0 && this.current.text != null) { this.state = XPathNodeType.Text; this.current.movedToText = true; retval = true; } return retval; } public override bool MoveToFirstNamespace(XPathNamespaceScope namespaceScope) { return false; } public override bool MoveToId(string id) { throw new NotSupportedException(); } public override bool MoveToNext() { if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } bool retval = false; if (this.state != XPathNodeType.Text) { ElementNode parent = this.current.parent; if (parent != null) { ElementNode temp = parent.MoveToNext(); if (temp == null && parent.text != null && !parent.movedToText) { this.state = XPathNodeType.Text; parent.movedToText = true; retval = true; } else if (temp != null) { this.state = XPathNodeType.Element; retval = true; this.current = temp; } } } return retval; } public override bool MoveToNextAttribute() { if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } bool retval = this.current.MoveToNextAttribute(); if (retval) { this.state = XPathNodeType.Attribute; } return retval; } public override bool MoveToNextNamespace(XPathNamespaceScope namespaceScope) { return false; } public override bool MoveToParent() { if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } bool retval = false; switch (this.state) { case XPathNodeType.Element: if (this.current.parent != null) { this.current = this.current.parent; this.state = XPathNodeType.Element; retval = true; } break; case XPathNodeType.Attribute: this.state = XPathNodeType.Element; retval = true; break; case XPathNodeType.Text: this.state = XPathNodeType.Element; retval = true; break; case XPathNodeType.Namespace: this.state = XPathNodeType.Element; retval = true; break; } return retval; } public override bool MoveToPrevious() { throw new NotSupportedException(); } public override void MoveToRoot() { this.current = this.root; this.state = XPathNodeType.Element; this.root.Reset(); } public override string Name { get { if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } string retval = null; switch (this.state) { case XPathNodeType.Element: retval = this.current.name; break; case XPathNodeType.Attribute: retval = this.current.CurrentAttribute.name; break; } return retval; } } public override System.Xml.XmlNameTable NameTable { get { return null; } } public override string NamespaceURI { get { return null; } } public override XPathNodeType NodeType { get { return this.state; } } public override string Prefix { get { if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } string retval = null; switch (this.state) { case XPathNodeType.Element: retval = this.current.prefix; break; case XPathNodeType.Attribute: retval = this.current.CurrentAttribute.prefix; break; case XPathNodeType.Namespace: retval = this.current.prefix; break; } return retval; } } public override string Value { get { if (this.current == null) { throw new InvalidOperationException(SR.GetString(SR.OperationInvalidOnAnEmptyDocument)); } string retval = null; switch (this.state) { case XPathNodeType.Text: retval = this.current.text.nodeValue; break; case XPathNodeType.Attribute: retval = this.current.CurrentAttribute.nodeValue; break; case XPathNodeType.Namespace: retval = this.current.xmlns; break; } return retval; } } public override string ToString() { this.MoveToRoot(); StringBuilder sb = new StringBuilder(); XmlTextWriter writer = new XmlTextWriter(new StringWriter(sb, CultureInfo.CurrentCulture)); writer.WriteNode(this, false); return sb.ToString(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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