Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / Core / XmlRawWriter.cs / 1305376 / XmlRawWriter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.IO; using System.Diagnostics; #if !SILVERLIGHT using System.Xml.XPath; #endif using System.Xml.Schema; using System.Collections; namespace System.Xml { ////// Implementations of XmlRawWriter are intended to be wrapped by the XmlWellFormedWriter. The /// well-formed writer performs many checks in behalf of the raw writer, and keeps state that the /// raw writer otherwise would have to keep. Therefore, the well-formed writer will call the /// XmlRawWriter using the following rules, in order to make raw writers easier to implement: /// /// 1. The well-formed writer keeps a stack of element names, and always calls /// WriteEndElement(string, string, string) instead of WriteEndElement(). /// 2. The well-formed writer tracks namespaces, and will pass himself in via the /// WellformedWriter property. It is used in the XmlRawWriter's implementation of IXmlNamespaceResolver. /// Thus, LookupPrefix does not have to be implemented. /// 3. The well-formed writer tracks write states, so the raw writer doesn't need to. /// 4. The well-formed writer will always call StartElementContent. /// 5. The well-formed writer will always call WriteNamespaceDeclaration for namespace nodes, /// rather than calling WriteStartAttribute(). If the writer is supporting namespace declarations in chunks /// (SupportsNamespaceDeclarationInChunks is true), the XmlWellFormedWriter will call WriteStartNamespaceDeclaration, /// then any method that can be used to write out a value of an attribute (WriteString, WriteChars, WriteRaw, WriteCharEntity...) /// and then WriteEndNamespaceDeclaration - instead of just a single WriteNamespaceDeclaration call. This feature will be /// supported by raw writers serializing to text that wish to preserve the attribute value escaping etc. /// 6. The well-formed writer guarantees a well-formed document, including correct call sequences, /// correct namespaces, and correct document rule enforcement. /// 7. All element and attribute names will be fully resolved and validated. Null will never be /// passed for any of the name parts. /// 8. The well-formed writer keeps track of xml:space and xml:lang. /// 9. The well-formed writer verifies NmToken, Name, and QName values and calls WriteString(). /// internal abstract class XmlRawWriter : XmlWriter { // // Fields // // base64 converter protected XmlRawWriterBase64Encoder base64Encoder; // namespace resolver protected IXmlNamespaceResolver resolver; // // XmlWriter implementation // // Raw writers do not have to track whether this is a well-formed document. public override void WriteStartDocument() { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } public override void WriteStartDocument(bool standalone) { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } public override void WriteEndDocument() { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } #if !SILVERLIGHT // This code is not being hit in Silverlight public override void WriteDocType(string name, string pubid, string sysid, string subset) { } #endif // Raw writers do not have to keep a stack of element names. public override void WriteEndElement() { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } // Raw writers do not have to keep a stack of element names. public override void WriteFullEndElement() { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } // By default, convert base64 value to string and call WriteString. public override void WriteBase64( byte[] buffer, int index, int count ) { if ( base64Encoder == null ) { base64Encoder = new XmlRawWriterBase64Encoder( this ); } // Encode will call WriteRaw to write out the encoded characters base64Encoder.Encode( buffer, index, count ); } // Raw writers do not have to keep track of namespaces. public override string LookupPrefix( string ns ) { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } // Raw writers do not have to keep track of write states. public override WriteState WriteState { get { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } } // Raw writers do not have to keep track of xml:space. public override XmlSpace XmlSpace { get { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } } // Raw writers do not have to keep track of xml:lang. public override string XmlLang { get { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } } // Raw writers do not have to verify NmToken values. public override void WriteNmToken( string name ) { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } // Raw writers do not have to verify Name values. public override void WriteName( string name ) { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } // Raw writers do not have to verify QName values. public override void WriteQualifiedName( string localName, string ns ) { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } #if !SILVERLIGHT // This code is not being hit in Silverlight // Forward call to WriteString(string). public override void WriteCData( string text ) { WriteString( text ); } // Forward call to WriteString(string). public override void WriteCharEntity( char ch ) { WriteString( new string( new char[] {ch} ) ); } // Forward call to WriteString(string). public override void WriteSurrogateCharEntity( char lowChar, char highChar ) { WriteString( new string( new char[] {lowChar, highChar} ) ); } // Forward call to WriteString(string). public override void WriteWhitespace( string ws ) { WriteString( ws ); } // Forward call to WriteString(string). public override void WriteChars( char[] buffer, int index, int count ) { WriteString( new string( buffer, index, count ) ); } // Forward call to WriteString(string). public override void WriteRaw(char[] buffer, int index, int count) { WriteString( new string( buffer, index, count ) ); } // Forward call to WriteString(string). public override void WriteRaw(string data) { WriteString( data ); } #endif // Override in order to handle Xml simple typed values and to pass resolver for QName values public override void WriteValue(object value) { if ( value == null ) { throw new ArgumentNullException( "value" ); } #if SILVERLIGHT // WriteString(XmlUntypedStringConverter.Instance.ToString( value, resolver ) ); #else WriteString(XmlUntypedConverter.Untyped.ToString( value, resolver ) ); #endif } // Override in order to handle Xml simple typed values and to pass resolver for QName values public override void WriteValue( string value ) { WriteString( value ); } // Copying to XmlRawWriter is not currently supported. public override void WriteAttributes( XmlReader reader, bool defattr ) { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } public override void WriteNode( XmlReader reader, bool defattr ) { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } #if !SILVERLIGHT // Removing dependency on XPathNavigator public override void WriteNode( System.Xml.XPath.XPathNavigator navigator, bool defattr ) { throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); } #endif // // XmlRawWriter methods and properties // // Get and set the namespace resolver that's used by this RawWriter to resolve prefixes. internal virtual IXmlNamespaceResolver NamespaceResolver { get { return resolver; } set { resolver = value; } } // Write the xml declaration. This must be the first call. #if !SILVERLIGHT // This code is not being hit in Silverlight internal virtual void WriteXmlDeclaration( XmlStandalone standalone ) { } internal virtual void WriteXmlDeclaration( string xmldecl ) { } #else internal abstract void WriteXmlDeclaration(XmlStandalone standalone); internal abstract void WriteXmlDeclaration(string xmldecl); #endif // Called after an element's attributes have been enumerated, but before any children have been // enumerated. This method must always be called, even for empty elements. internal abstract void StartElementContent(); // Called before a root element is written (before the WriteStartElement call) // the conformanceLevel specifies the current conformance level the writer is operating with. internal virtual void OnRootElement(ConformanceLevel conformanceLevel) { } // WriteEndElement() and WriteFullEndElement() overloads, in which caller gives the full name of the // element, so that raw writers do not need to keep a stack of element names. This method should // always be called instead of WriteEndElement() or WriteFullEndElement() without parameters. internal abstract void WriteEndElement( string prefix, string localName, string ns ); #if !SILVERLIGHT // This code is not being hit in Silverlight internal virtual void WriteFullEndElement( string prefix, string localName, string ns ) { WriteEndElement( prefix, localName, ns ); } #else internal abstract void WriteFullEndElement(string prefix, string localName, string ns); #endif internal virtual void WriteQualifiedName( string prefix, string localName, string ns ) { if ( prefix.Length != 0 ) { WriteString( prefix ); WriteString( ":" ); } WriteString( localName ); } // This method must be called instead of WriteStartAttribute() for namespaces. internal abstract void WriteNamespaceDeclaration( string prefix, string ns ); // When true, the XmlWellFormedWriter will call: // 1) WriteStartNamespaceDeclaration // 2) any method that can be used to write out a value of an attribute: WriteString, WriteChars, WriteRaw, WriteCharEntity... // 3) WriteEndNamespaceDeclaration // instead of just a single WriteNamespaceDeclaration call. // // This feature will be supported by raw writers serializing to text that wish to preserve the attribute value escaping and entities. internal virtual bool SupportsNamespaceDeclarationInChunks { get { return false; } } internal virtual void WriteStartNamespaceDeclaration(string prefix) { throw new NotSupportedException(); } internal virtual void WriteEndNamespaceDeclaration() { throw new NotSupportedException(); } // This is called when the remainder of a base64 value should be output. internal virtual void WriteEndBase64() { // The Flush will call WriteRaw to write out the rest of the encoded characters base64Encoder.Flush(); } internal virtual void Close( WriteState currentState ) { Close(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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