Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / Core / XmlEventCache.cs / 1 / XmlEventCache.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// [....]
//-----------------------------------------------------------------------------
namespace System.Xml {
using System;
using System.Diagnostics;
using System.Text;
using System.IO;
using System.Collections;
using System.Xml.Schema;
///
/// Caches sequence of XmlEvents so that they can be replayed later.
///
internal sealed class XmlEventCache : XmlRawWriter {
private ArrayList pages; // All event pages
private XmlEvent[] pageCurr; // Page that is currently being built
private int pageSize; // Number of events in pageCurr
private bool hasRootNode; // True if the cached document has a root node, false if it's a fragment
private string singleText; // If document consists of a single text node, cache it here rather than creating pages
private string baseUri; // Base Uri of document
private enum XmlEventType {
Unknown = 0,
DocType,
StartElem,
StartAttr,
EndAttr,
CData,
Comment,
PI,
Whitespace,
String,
Raw,
EntRef,
CharEnt,
SurrCharEnt,
Base64,
BinHex,
XmlDecl1,
XmlDecl2,
StartContent,
EndElem,
FullEndElem,
Nmsp,
EndBase64,
Close,
Flush,
Dispose,
}
#if DEBUG
private const int InitialPageSize = 4;
#else
private const int InitialPageSize = 32;
#endif
public XmlEventCache(string baseUri, bool hasRootNode) {
this.baseUri = baseUri;
this.hasRootNode = hasRootNode;
}
public void EndEvents() {
if (this.singleText == null)
AddEvent(XmlEventType.Unknown);
}
//-----------------------------------------------
// XmlEventCache methods
//-----------------------------------------------
///
/// Return Base Uri of the document.
///
public string BaseUri {
get { return this.baseUri; }
}
///
/// Return true if the cached document has a root node, false if it's a fragment.
///
public bool HasRootNode {
get { return this.hasRootNode; }
}
///
/// Replay all cached events to an XmlWriter.
///
public void EventsToWriter(XmlWriter writer) {
XmlEvent[] page;
int idxPage, idxEvent;
byte[] bytes;
char[] chars;
XmlRawWriter rawWriter;
// Special-case single text node at the top-level
if (this.singleText != null) {
writer.WriteString(this.singleText);
return;
}
rawWriter = writer as XmlRawWriter;
// Loop over set of pages
for (idxPage = 0; idxPage < this.pages.Count; idxPage++) {
page = this.pages[idxPage] as XmlEvent[];
// Loop over events in each page
for (idxEvent = 0; idxEvent < page.Length; idxEvent++) {
switch (page[idxEvent].EventType) {
case XmlEventType.Unknown:
// No more events
Debug.Assert(idxPage + 1 == this.pages.Count);
return;
case XmlEventType.DocType:
writer.WriteDocType(page[idxEvent].String1, page[idxEvent].String2, page[idxEvent].String3, (string) page[idxEvent].Object);
break;
case XmlEventType.StartElem:
writer.WriteStartElement(page[idxEvent].String1, page[idxEvent].String2, page[idxEvent].String3);
break;
case XmlEventType.StartAttr:
writer.WriteStartAttribute(page[idxEvent].String1, page[idxEvent].String2, page[idxEvent].String3);
break;
case XmlEventType.EndAttr:
writer.WriteEndAttribute();
break;
case XmlEventType.CData:
writer.WriteCData(page[idxEvent].String1);
break;
case XmlEventType.Comment:
writer.WriteComment(page[idxEvent].String1);
break;
case XmlEventType.PI:
writer.WriteProcessingInstruction(page[idxEvent].String1, page[idxEvent].String2);
break;
case XmlEventType.Whitespace:
writer.WriteWhitespace(page[idxEvent].String1);
break;
case XmlEventType.String:
writer.WriteString(page[idxEvent].String1);
break;
case XmlEventType.Raw:
writer.WriteRaw(page[idxEvent].String1);
break;
case XmlEventType.EntRef:
writer.WriteEntityRef(page[idxEvent].String1);
break;
case XmlEventType.CharEnt:
writer.WriteCharEntity((char) page[idxEvent].Object);
break;
case XmlEventType.SurrCharEnt:
chars = (char[]) page[idxEvent].Object;
writer.WriteSurrogateCharEntity(chars[0], chars[1]);
break;
case XmlEventType.Base64:
bytes = (byte[]) page[idxEvent].Object;
writer.WriteBase64(bytes, 0, bytes.Length);
break;
case XmlEventType.BinHex:
bytes = (byte[]) page[idxEvent].Object;
writer.WriteBinHex(bytes, 0, bytes.Length);
break;
case XmlEventType.XmlDecl1:
if (rawWriter != null)
rawWriter.WriteXmlDeclaration((XmlStandalone) page[idxEvent].Object);
break;
case XmlEventType.XmlDecl2:
if (rawWriter != null)
rawWriter.WriteXmlDeclaration(page[idxEvent].String1);
break;
case XmlEventType.StartContent:
if (rawWriter != null)
rawWriter.StartElementContent();
break;
case XmlEventType.EndElem:
if (rawWriter != null)
rawWriter.WriteEndElement(page[idxEvent].String1, page[idxEvent].String2, page[idxEvent].String3);
else
writer.WriteEndElement();
break;
case XmlEventType.FullEndElem:
if (rawWriter != null)
rawWriter.WriteFullEndElement(page[idxEvent].String1, page[idxEvent].String2, page[idxEvent].String3);
else
writer.WriteFullEndElement();
break;
case XmlEventType.Nmsp:
if (rawWriter != null)
rawWriter.WriteNamespaceDeclaration(page[idxEvent].String1, page[idxEvent].String2);
else
writer.WriteAttributeString("xmlns", page[idxEvent].String1, XmlReservedNs.NsXmlNs, page[idxEvent].String2);
break;
case XmlEventType.EndBase64:
if (rawWriter != null)
rawWriter.WriteEndBase64();
break;
case XmlEventType.Close:
writer.Close();
break;
case XmlEventType.Flush:
writer.Flush();
break;
case XmlEventType.Dispose:
((IDisposable)writer).Dispose();
break;
default:
Debug.Assert(false, "Unknown event: " + page[idxEvent].EventType);
break;
}
}
}
Debug.Assert(false, "Unknown event should be added to end of event sequence.");
}
///
/// Concatenate all element text and atomic value events and return the resulting string.
///
public string EventsToString() {
StringBuilder bldr;
XmlEvent[] page;
int idxPage, idxEvent;
bool inAttr;
// Special-case single text node at the top-level
if (this.singleText != null)
return this.singleText;
bldr = new StringBuilder();
// Loop over set of pages
inAttr = false;
for (idxPage = 0; idxPage < this.pages.Count; idxPage++) {
page = this.pages[idxPage] as XmlEvent[];
// Loop over events in each page
for (idxEvent = 0; idxEvent < page.Length; idxEvent++) {
switch (page[idxEvent].EventType) {
case XmlEventType.Unknown:
// No more events
Debug.Assert(idxPage + 1 == this.pages.Count);
return bldr.ToString();
case XmlEventType.String:
case XmlEventType.Whitespace:
case XmlEventType.Raw:
case XmlEventType.CData:
// Append text
if (!inAttr)
bldr.Append(page[idxEvent].String1);
break;
case XmlEventType.StartAttr:
// Don't append text or atomic values if they appear within attributes
inAttr = true;
break;
case XmlEventType.EndAttr:
// No longer in an attribute
inAttr = false;
break;
}
}
}
Debug.Assert(false, "Unknown event should be added to end of event sequence.");
return string.Empty;
}
//-----------------------------------------------
// XmlWriter interface
//-----------------------------------------------
public override XmlWriterSettings Settings {
get { return null; }
}
public override void WriteDocType(string name, string pubid, string sysid, string subset) {
AddEvent(XmlEventType.DocType, name, pubid, sysid, subset);
}
public override void WriteStartElement(string prefix, string localName, string ns) {
AddEvent(XmlEventType.StartElem, prefix, localName, ns);
}
public override void WriteStartAttribute(string prefix, string localName, string ns) {
AddEvent(XmlEventType.StartAttr, prefix, localName, ns);
}
public override void WriteEndAttribute() {
AddEvent(XmlEventType.EndAttr);
}
public override void WriteCData(string text) {
AddEvent(XmlEventType.CData, text);
}
public override void WriteComment(string text) {
AddEvent(XmlEventType.Comment, text);
}
public override void WriteProcessingInstruction(string name, string text) {
AddEvent(XmlEventType.PI, name, text);
}
public override void WriteWhitespace(string ws) {
AddEvent(XmlEventType.Whitespace, ws);
}
public override void WriteString(string text) {
// Special-case single text node at the top level
if (this.pages == null) {
if (this.singleText == null)
this.singleText = text;
else
this.singleText += text;
}
else {
AddEvent(XmlEventType.String, text);
}
}
public override void WriteChars(char[] buffer, int index, int count) {
WriteString(new string(buffer, index, count));
}
public override void WriteRaw(char[] buffer, int index, int count) {
WriteRaw(new string(buffer, index, count));
}
public override void WriteRaw(string data) {
AddEvent(XmlEventType.Raw, data);
}
public override void WriteEntityRef(string name) {
AddEvent(XmlEventType.EntRef, name);
}
public override void WriteCharEntity(char ch) {
AddEvent(XmlEventType.CharEnt, (object) ch);
}
public override void WriteSurrogateCharEntity(char lowChar, char highChar) {
// Save high and low characters
char[] chars = {lowChar, highChar};
AddEvent(XmlEventType.SurrCharEnt, (object) chars);
}
public override void WriteBase64(byte[] buffer, int index, int count) {
AddEvent(XmlEventType.Base64, (object) ToBytes(buffer, index, count));
}
public override void WriteBinHex(byte[] buffer, int index, int count) {
AddEvent(XmlEventType.BinHex, (object) ToBytes(buffer, index, count));
}
public override void Close() {
AddEvent(XmlEventType.Close);
}
public override void Flush() {
AddEvent(XmlEventType.Flush);
}
///
/// All other WriteValue methods are implemented by XmlWriter to delegate to WriteValue(object) or WriteValue(string), so
/// only these two methods need to be implemented.
///
public override void WriteValue(object value) {
WriteString(XmlUntypedConverter.Untyped.ToString(value, this.resolver));
}
public override void WriteValue(string value) {
WriteString(value);
}
protected override void Dispose(bool disposing) {
try {
AddEvent(XmlEventType.Dispose);
}
finally {
base.Dispose(disposing);
}
}
//-----------------------------------------------
// XmlRawWriter interface
//-----------------------------------------------
internal override void WriteXmlDeclaration(XmlStandalone standalone) {
AddEvent(XmlEventType.XmlDecl1, (object) standalone);
}
internal override void WriteXmlDeclaration(string xmldecl) {
AddEvent(XmlEventType.XmlDecl2, xmldecl);
}
internal override void StartElementContent() {
AddEvent(XmlEventType.StartContent);
}
internal override void WriteEndElement(string prefix, string localName, string ns) {
AddEvent(XmlEventType.EndElem, prefix, localName, ns);
}
internal override void WriteFullEndElement(string prefix, string localName, string ns) {
AddEvent(XmlEventType.FullEndElem, prefix, localName, ns);
}
internal override void WriteNamespaceDeclaration(string prefix, string ns) {
AddEvent(XmlEventType.Nmsp, prefix, ns);
}
internal override void WriteEndBase64() {
AddEvent(XmlEventType.EndBase64);
}
//-----------------------------------------------
// Helper methods
//-----------------------------------------------
private void AddEvent(XmlEventType eventType) {
int idx = NewEvent();
this.pageCurr[idx].InitEvent(eventType);
}
private void AddEvent(XmlEventType eventType, string s1) {
int idx = NewEvent();
this.pageCurr[idx].InitEvent(eventType, s1);
}
private void AddEvent(XmlEventType eventType, string s1, string s2) {
int idx = NewEvent();
this.pageCurr[idx].InitEvent(eventType, s1, s2);
}
private void AddEvent(XmlEventType eventType, string s1, string s2, string s3) {
int idx = NewEvent();
this.pageCurr[idx].InitEvent(eventType, s1, s2, s3);
}
private void AddEvent(XmlEventType eventType, string s1, string s2, string s3, object o) {
int idx = NewEvent();
this.pageCurr[idx].InitEvent(eventType, s1, s2, s3, o);
}
private void AddEvent(XmlEventType eventType, object o) {
int idx = NewEvent();
this.pageCurr[idx].InitEvent(eventType, o);
}
private int NewEvent() {
if (this.pages == null) {
this.pages = new ArrayList();
this.pageCurr = new XmlEvent[InitialPageSize];
this.pages.Add(this.pageCurr);
if (this.singleText != null) {
this.pageCurr[0].InitEvent(XmlEventType.String, this.singleText);
this.pageSize++;
this.singleText = null;
}
}
else if (this.pageSize >= this.pageCurr.Length) {
// Create new page
this.pageCurr = new XmlEvent[this.pageSize * 2];
this.pages.Add(this.pageCurr);
this.pageSize = 0;
}
return this.pageSize++;
}
///
/// Create a standalone buffer that doesn't need an index or count passed along with it.
///
private static byte[] ToBytes(byte[] buffer, int index, int count) {
if (index != 0 || count != buffer.Length) {
if (buffer.Length - index > count)
count = buffer.Length - index;
byte[] bufferNew = new byte[count];
Array.Copy(buffer, index, bufferNew, 0, count);
return bufferNew;
}
return buffer;
}
///
/// Caches information for XML events like BeginElement, String, and EndAttribute so that they can be replayed later.
///
private struct XmlEvent {
private XmlEventType eventType;
private string s1;
private string s2;
private string s3;
private object o;
public void InitEvent(XmlEventType eventType) {
this.eventType = eventType;
}
public void InitEvent(XmlEventType eventType, string s1) {
this.eventType = eventType;
this.s1 = s1;
}
public void InitEvent(XmlEventType eventType, string s1, string s2) {
this.eventType = eventType;
this.s1 = s1;
this.s2 = s2;
}
public void InitEvent(XmlEventType eventType, string s1, string s2, string s3) {
this.eventType = eventType;
this.s1 = s1;
this.s2 = s2;
this.s3 = s3;
}
public void InitEvent(XmlEventType eventType, string s1, string s2, string s3, object o) {
this.eventType = eventType;
this.s1 = s1;
this.s2 = s2;
this.s3 = s3;
this.o = o;
}
public void InitEvent(XmlEventType eventType, object o) {
this.eventType = eventType;
this.o = o;
}
public XmlEventType EventType {
get { return this.eventType; }
}
public string String1 {
get { return this.s1; }
}
public string String2 {
get { return this.s2; }
}
public string String3 {
get { return this.s3; }
}
public object Object {
get { return this.o; }
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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