Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / XmlUtils / System / Xml / Xsl / Runtime / XmlSequenceWriter.cs / 1 / XmlSequenceWriter.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// [....]
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Schema;
namespace System.Xml.Xsl.Runtime {
using Res = System.Xml.Utils.Res;
///
/// External XmlWriter Cached Sequence
/// ===================================================================================================
/// Multiple Trees Merged into Entity Multiple Trees
///
/// Attributes Error Floating
/// at top-level Attribute
///
/// Namespace Error Floating
/// at top-level Namespace
///
/// Elements, Text, PI Implicit Root Floating
/// Comments at top-level Nodes
///
/// Root at top-level Ignored Root
///
/// Atomic Values Whitespace-Separated Atomic Values
/// at top-level Text Node
///
/// Nodes By Reference Copied Preserve Identity
///
internal abstract class XmlSequenceWriter {
///
/// Start construction of a new Xml tree (document or fragment).
///
public abstract XmlRawWriter StartTree(XPathNodeType rootType, IXmlNamespaceResolver nsResolver, XmlNameTable nameTable);
///
/// End construction of a new Xml tree (document or fragment).
///
public abstract void EndTree();
///
/// Write a top-level item by reference.
///
public abstract void WriteItem(XPathItem item);
}
///
/// An implementation of XmlSequenceWriter that builds a cached XPath/XQuery sequence.
///
internal class XmlCachedSequenceWriter : XmlSequenceWriter {
private XmlQueryItemSequence seqTyped;
private XPathDocument doc;
private XmlRawWriter writer;
///
/// Constructor.
///
public XmlCachedSequenceWriter() {
this.seqTyped = new XmlQueryItemSequence();
}
///
/// Return the sequence after it has been fully constructed.
///
public XmlQueryItemSequence ResultSequence {
get { return this.seqTyped; }
}
///
/// Start construction of a new Xml tree (document or fragment).
///
public override XmlRawWriter StartTree(XPathNodeType rootType, IXmlNamespaceResolver nsResolver, XmlNameTable nameTable) {
// Build XPathDocument
// If rootType != XPathNodeType.Root, then build an XQuery fragment
this.doc = new XPathDocument(nameTable);
this.writer = doc.LoadFromWriter(XPathDocument.LoadFlags.AtomizeNames | (rootType == XPathNodeType.Root ? XPathDocument.LoadFlags.None : XPathDocument.LoadFlags.Fragment), string.Empty);
this.writer.NamespaceResolver = nsResolver;
return this.writer;
}
///
/// End construction of a new Xml tree (document or fragment).
///
public override void EndTree() {
// Add newly constructed document to sequence
this.writer.Close();
this.seqTyped.Add(this.doc.CreateNavigator());
}
///
/// Write a top-level item by reference.
///
public override void WriteItem(XPathItem item) {
// Preserve identity
this.seqTyped.AddClone(item);
}
}
///
/// An implementation of XmlSequenceWriter that converts an instance of the XQuery data model into a series
/// of calls to XmlRawWriter. The algorithm to do this is designed to be compatible with the rules in the
/// "XSLT 2.0 and XQuery 1.0 Serialization" spec. Here are the rules we use:
/// 1. An exception is thrown if the top-level sequence contains attribute or namespace nodes
/// 2. Each atomic value in the top-level sequence is converted to text, and XmlWriter.WriteString is called
/// 3. A call to XmlRawWriter.WriteWhitespace(" ") is made between adjacent atomic values at the top-level
/// 4. All items in the top-level sequence are merged together into a single result document.
///
internal class XmlMergeSequenceWriter : XmlSequenceWriter {
private XmlRawWriter xwrt;
private bool lastItemWasAtomic;
///
/// Constructor.
///
public XmlMergeSequenceWriter(XmlRawWriter xwrt) {
this.xwrt = xwrt;
this.lastItemWasAtomic = false;
}
///
/// Start construction of a new Xml tree (document or fragment).
///
public override XmlRawWriter StartTree(XPathNodeType rootType, IXmlNamespaceResolver nsResolver, XmlNameTable nameTable) {
if (rootType == XPathNodeType.Attribute || rootType == XPathNodeType.Namespace)
throw new XslTransformException(Res.XmlIl_TopLevelAttrNmsp, string.Empty);
// Provide a namespace resolver to the writer
this.xwrt.NamespaceResolver = nsResolver;
return this.xwrt;
}
///
/// End construction of a new Xml tree (document or fragment).
///
public override void EndTree() {
this.lastItemWasAtomic = false;
}
///
/// Write a top-level item by reference.
///
public override void WriteItem(XPathItem item) {
if (item.IsNode) {
XPathNavigator nav = item as XPathNavigator;
if (nav.NodeType == XPathNodeType.Attribute || nav.NodeType == XPathNodeType.Namespace)
throw new XslTransformException(Res.XmlIl_TopLevelAttrNmsp, string.Empty);
// Copy navigator to raw writer
CopyNode(nav);
this.lastItemWasAtomic = false;
}
else {
WriteString(item.Value);
}
}
///
/// Write the string value of a top-level atomic value.
///
private void WriteString(string value) {
if (this.lastItemWasAtomic) {
// Insert space character between adjacent atomic values
this.xwrt.WriteWhitespace(" ");
}
else {
this.lastItemWasAtomic = true;
}
this.xwrt.WriteString(value);
}
///
/// Copy the navigator subtree to the raw writer.
///
private void CopyNode(XPathNavigator nav) {
XPathNodeType nodeType;
int iLevel = 0;
while (true) {
if (CopyShallowNode(nav)) {
nodeType = nav.NodeType;
if (nodeType == XPathNodeType.Element) {
// Copy attributes
if (nav.MoveToFirstAttribute()) {
do {
CopyShallowNode(nav);
}
while (nav.MoveToNextAttribute());
nav.MoveToParent();
}
// Copy namespaces in document order (navigator returns them in reverse document order)
XPathNamespaceScope nsScope = (iLevel == 0) ? XPathNamespaceScope.ExcludeXml : XPathNamespaceScope.Local;
if (nav.MoveToFirstNamespace(nsScope)) {
CopyNamespaces(nav, nsScope);
nav.MoveToParent();
}
this.xwrt.StartElementContent();
}
// If children exist, move down to next level
if (nav.MoveToFirstChild()) {
iLevel++;
continue;
}
else {
// EndElement
if (nav.NodeType == XPathNodeType.Element)
this.xwrt.WriteEndElement(nav.Prefix, nav.LocalName, nav.NamespaceURI);
}
}
// No children
while (true) {
if (iLevel == 0) {
// The entire subtree has been copied
return;
}
if (nav.MoveToNext()) {
// Found a sibling, so break to outer loop
break;
}
// No siblings, so move up to previous level
iLevel--;
nav.MoveToParent();
// EndElement
if (nav.NodeType == XPathNodeType.Element)
this.xwrt.WriteFullEndElement(nav.Prefix, nav.LocalName, nav.NamespaceURI);
}
}
}
///
/// Begin shallow copy of the specified node to the writer. Returns true if the node might have content.
///
private bool CopyShallowNode(XPathNavigator nav) {
bool mayHaveChildren = false;
switch (nav.NodeType) {
case XPathNodeType.Element:
this.xwrt.WriteStartElement(nav.Prefix, nav.LocalName, nav.NamespaceURI);
mayHaveChildren = true;
break;
case XPathNodeType.Attribute:
this.xwrt.WriteStartAttribute(nav.Prefix, nav.LocalName, nav.NamespaceURI);
this.xwrt.WriteString(nav.Value);
this.xwrt.WriteEndAttribute();
break;
case XPathNodeType.Text:
this.xwrt.WriteString(nav.Value);
break;
case XPathNodeType.SignificantWhitespace:
case XPathNodeType.Whitespace:
this.xwrt.WriteWhitespace(nav.Value);
break;
case XPathNodeType.Root:
mayHaveChildren = true;
break;
case XPathNodeType.Comment:
this.xwrt.WriteComment(nav.Value);
break;
case XPathNodeType.ProcessingInstruction:
this.xwrt.WriteProcessingInstruction(nav.LocalName, nav.Value);
break;
case XPathNodeType.Namespace:
this.xwrt.WriteNamespaceDeclaration(nav.LocalName, nav.Value);
break;
default:
Debug.Assert(false);
break;
}
return mayHaveChildren;
}
///
/// Copy all or some (which depends on nsScope) of the namespaces on the navigator's current node to the
/// raw writer.
///
private void CopyNamespaces(XPathNavigator nav, XPathNamespaceScope nsScope) {
string prefix = nav.LocalName;
string ns = nav.Value;
if (nav.MoveToNextNamespace(nsScope)) {
CopyNamespaces(nav, nsScope);
}
this.xwrt.WriteNamespaceDeclaration(prefix, ns);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// [....]
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Schema;
namespace System.Xml.Xsl.Runtime {
using Res = System.Xml.Utils.Res;
///
/// External XmlWriter Cached Sequence
/// ===================================================================================================
/// Multiple Trees Merged into Entity Multiple Trees
///
/// Attributes Error Floating
/// at top-level Attribute
///
/// Namespace Error Floating
/// at top-level Namespace
///
/// Elements, Text, PI Implicit Root Floating
/// Comments at top-level Nodes
///
/// Root at top-level Ignored Root
///
/// Atomic Values Whitespace-Separated Atomic Values
/// at top-level Text Node
///
/// Nodes By Reference Copied Preserve Identity
///
internal abstract class XmlSequenceWriter {
///
/// Start construction of a new Xml tree (document or fragment).
///
public abstract XmlRawWriter StartTree(XPathNodeType rootType, IXmlNamespaceResolver nsResolver, XmlNameTable nameTable);
///
/// End construction of a new Xml tree (document or fragment).
///
public abstract void EndTree();
///
/// Write a top-level item by reference.
///
public abstract void WriteItem(XPathItem item);
}
///
/// An implementation of XmlSequenceWriter that builds a cached XPath/XQuery sequence.
///
internal class XmlCachedSequenceWriter : XmlSequenceWriter {
private XmlQueryItemSequence seqTyped;
private XPathDocument doc;
private XmlRawWriter writer;
///
/// Constructor.
///
public XmlCachedSequenceWriter() {
this.seqTyped = new XmlQueryItemSequence();
}
///
/// Return the sequence after it has been fully constructed.
///
public XmlQueryItemSequence ResultSequence {
get { return this.seqTyped; }
}
///
/// Start construction of a new Xml tree (document or fragment).
///
public override XmlRawWriter StartTree(XPathNodeType rootType, IXmlNamespaceResolver nsResolver, XmlNameTable nameTable) {
// Build XPathDocument
// If rootType != XPathNodeType.Root, then build an XQuery fragment
this.doc = new XPathDocument(nameTable);
this.writer = doc.LoadFromWriter(XPathDocument.LoadFlags.AtomizeNames | (rootType == XPathNodeType.Root ? XPathDocument.LoadFlags.None : XPathDocument.LoadFlags.Fragment), string.Empty);
this.writer.NamespaceResolver = nsResolver;
return this.writer;
}
///
/// End construction of a new Xml tree (document or fragment).
///
public override void EndTree() {
// Add newly constructed document to sequence
this.writer.Close();
this.seqTyped.Add(this.doc.CreateNavigator());
}
///
/// Write a top-level item by reference.
///
public override void WriteItem(XPathItem item) {
// Preserve identity
this.seqTyped.AddClone(item);
}
}
///
/// An implementation of XmlSequenceWriter that converts an instance of the XQuery data model into a series
/// of calls to XmlRawWriter. The algorithm to do this is designed to be compatible with the rules in the
/// "XSLT 2.0 and XQuery 1.0 Serialization" spec. Here are the rules we use:
/// 1. An exception is thrown if the top-level sequence contains attribute or namespace nodes
/// 2. Each atomic value in the top-level sequence is converted to text, and XmlWriter.WriteString is called
/// 3. A call to XmlRawWriter.WriteWhitespace(" ") is made between adjacent atomic values at the top-level
/// 4. All items in the top-level sequence are merged together into a single result document.
///
internal class XmlMergeSequenceWriter : XmlSequenceWriter {
private XmlRawWriter xwrt;
private bool lastItemWasAtomic;
///
/// Constructor.
///
public XmlMergeSequenceWriter(XmlRawWriter xwrt) {
this.xwrt = xwrt;
this.lastItemWasAtomic = false;
}
///
/// Start construction of a new Xml tree (document or fragment).
///
public override XmlRawWriter StartTree(XPathNodeType rootType, IXmlNamespaceResolver nsResolver, XmlNameTable nameTable) {
if (rootType == XPathNodeType.Attribute || rootType == XPathNodeType.Namespace)
throw new XslTransformException(Res.XmlIl_TopLevelAttrNmsp, string.Empty);
// Provide a namespace resolver to the writer
this.xwrt.NamespaceResolver = nsResolver;
return this.xwrt;
}
///
/// End construction of a new Xml tree (document or fragment).
///
public override void EndTree() {
this.lastItemWasAtomic = false;
}
///
/// Write a top-level item by reference.
///
public override void WriteItem(XPathItem item) {
if (item.IsNode) {
XPathNavigator nav = item as XPathNavigator;
if (nav.NodeType == XPathNodeType.Attribute || nav.NodeType == XPathNodeType.Namespace)
throw new XslTransformException(Res.XmlIl_TopLevelAttrNmsp, string.Empty);
// Copy navigator to raw writer
CopyNode(nav);
this.lastItemWasAtomic = false;
}
else {
WriteString(item.Value);
}
}
///
/// Write the string value of a top-level atomic value.
///
private void WriteString(string value) {
if (this.lastItemWasAtomic) {
// Insert space character between adjacent atomic values
this.xwrt.WriteWhitespace(" ");
}
else {
this.lastItemWasAtomic = true;
}
this.xwrt.WriteString(value);
}
///
/// Copy the navigator subtree to the raw writer.
///
private void CopyNode(XPathNavigator nav) {
XPathNodeType nodeType;
int iLevel = 0;
while (true) {
if (CopyShallowNode(nav)) {
nodeType = nav.NodeType;
if (nodeType == XPathNodeType.Element) {
// Copy attributes
if (nav.MoveToFirstAttribute()) {
do {
CopyShallowNode(nav);
}
while (nav.MoveToNextAttribute());
nav.MoveToParent();
}
// Copy namespaces in document order (navigator returns them in reverse document order)
XPathNamespaceScope nsScope = (iLevel == 0) ? XPathNamespaceScope.ExcludeXml : XPathNamespaceScope.Local;
if (nav.MoveToFirstNamespace(nsScope)) {
CopyNamespaces(nav, nsScope);
nav.MoveToParent();
}
this.xwrt.StartElementContent();
}
// If children exist, move down to next level
if (nav.MoveToFirstChild()) {
iLevel++;
continue;
}
else {
// EndElement
if (nav.NodeType == XPathNodeType.Element)
this.xwrt.WriteEndElement(nav.Prefix, nav.LocalName, nav.NamespaceURI);
}
}
// No children
while (true) {
if (iLevel == 0) {
// The entire subtree has been copied
return;
}
if (nav.MoveToNext()) {
// Found a sibling, so break to outer loop
break;
}
// No siblings, so move up to previous level
iLevel--;
nav.MoveToParent();
// EndElement
if (nav.NodeType == XPathNodeType.Element)
this.xwrt.WriteFullEndElement(nav.Prefix, nav.LocalName, nav.NamespaceURI);
}
}
}
///
/// Begin shallow copy of the specified node to the writer. Returns true if the node might have content.
///
private bool CopyShallowNode(XPathNavigator nav) {
bool mayHaveChildren = false;
switch (nav.NodeType) {
case XPathNodeType.Element:
this.xwrt.WriteStartElement(nav.Prefix, nav.LocalName, nav.NamespaceURI);
mayHaveChildren = true;
break;
case XPathNodeType.Attribute:
this.xwrt.WriteStartAttribute(nav.Prefix, nav.LocalName, nav.NamespaceURI);
this.xwrt.WriteString(nav.Value);
this.xwrt.WriteEndAttribute();
break;
case XPathNodeType.Text:
this.xwrt.WriteString(nav.Value);
break;
case XPathNodeType.SignificantWhitespace:
case XPathNodeType.Whitespace:
this.xwrt.WriteWhitespace(nav.Value);
break;
case XPathNodeType.Root:
mayHaveChildren = true;
break;
case XPathNodeType.Comment:
this.xwrt.WriteComment(nav.Value);
break;
case XPathNodeType.ProcessingInstruction:
this.xwrt.WriteProcessingInstruction(nav.LocalName, nav.Value);
break;
case XPathNodeType.Namespace:
this.xwrt.WriteNamespaceDeclaration(nav.LocalName, nav.Value);
break;
default:
Debug.Assert(false);
break;
}
return mayHaveChildren;
}
///
/// Copy all or some (which depends on nsScope) of the namespaces on the navigator's current node to the
/// raw writer.
///
private void CopyNamespaces(XPathNavigator nav, XPathNamespaceScope nsScope) {
string prefix = nav.LocalName;
string ns = nav.Value;
if (nav.MoveToNextNamespace(nsScope)) {
CopyNamespaces(nav, nsScope);
}
this.xwrt.WriteNamespaceDeclaration(prefix, ns);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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