XmlValidatingReaderImpl.cs source code in C# .NET

                        
Code:
                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / Xml / System / Xml / Core / XmlValidatingReaderImpl.cs / 1 / XmlValidatingReaderImpl.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
using System; 
using System.IO;
using System.Text; 
using System.Xml.Schema;
using System.Collections;
using System.Diagnostics;
using System.Globalization; 
using System.Security.Policy;
using System.Collections.Generic; 
using System.Security.Permissions; 

namespace System.Xml 
{
    internal sealed class XmlValidatingReaderImpl : XmlReader, IXmlLineInfo, IXmlNamespaceResolver {
//
// Private helper types 
//
        // ParsingFunction = what should the reader do when the next Read() is called 
        enum ParsingFunction { 
            Read = 0,
            Init, 
            ParseDtdFromContext,
            ResolveEntityInternally,
            InReadBinaryContent,
            ReaderClosed, 
            Error,
            None, 
        } 

// 
// Fields
//
        // core text reader
        XmlReader               coreReader; 
        XmlTextReaderImpl       coreReaderImpl;
        IXmlNamespaceResolver   coreReaderNSResolver; 
 
        // validation
        ValidationType      validationType; 
        BaseValidator       validator;

#pragma warning disable 618
        XmlSchemaCollection schemaCollection; 
#pragma warning restore 618
        bool                processIdentityConstraints; 
 
        // parsing function (state)
        ParsingFunction     parsingFunction = ParsingFunction.Init; 

        // event handlers
        ValidationEventHandler internalEventHandler;
        ValidationEventHandler eventHandler; 

        // misc 
        XmlParserContext    parserContext; 

        // helper for Read[Element]ContentAs{Base64,BinHex} methods 
        ReadContentAsBinaryHelper  readBinaryHelper;

        // Outer XmlReader exposed to the user - either XmlValidatingReader or XmlValidatingReaderImpl (when created via XmlReader.Create).
        // Virtual methods called from within XmlValidatingReaderImpl must be called on the outer reader so in case the user overrides 
        // some of the XmlValidatingReader methods we will call the overriden version.
        XmlReader       outerReader; 
 
//
// Constructors 
//
        // Initializes a new instance of XmlValidatingReaderImpl class with the specified XmlReader.
        // This constructor is used when creating XmlValidatingReaderImpl for V1 XmlValidatingReader
        internal XmlValidatingReaderImpl( XmlReader reader ) { 
            outerReader = this;
            coreReader = reader; 
            coreReaderNSResolver = reader as IXmlNamespaceResolver; 
            coreReaderImpl = reader as XmlTextReaderImpl;
            if ( coreReaderImpl == null ) { 
                XmlTextReader tr = reader as XmlTextReader;
                if ( tr != null ) {
                    coreReaderImpl = tr.Impl;
                } 
            }
            if ( coreReaderImpl == null ) { 
                throw new ArgumentException( Res.GetString( Res.Arg_ExpectingXmlTextReader ), "reader" ); 
            }
            coreReaderImpl.EntityHandling = EntityHandling.ExpandEntities; 
            coreReaderImpl.XmlValidatingReaderCompatibilityMode = true;
            this.processIdentityConstraints = true;

#pragma warning disable 618 
            schemaCollection = new XmlSchemaCollection( coreReader.NameTable );
            schemaCollection.XmlResolver = GetResolver(); 
 
            internalEventHandler = new ValidationEventHandler( InternalValidationCallback );
            eventHandler = internalEventHandler; 
            coreReaderImpl.ValidationEventHandler = internalEventHandler;

            validationType = ValidationType.Auto;
            SetupValidation( ValidationType.Auto ); 
#pragma warning restore 618
 
        } 

        // Initializes a new instance of XmlValidatingReaderImpl class for parsing fragments with the specified string, fragment type and parser context 
        // This constructor is used when creating XmlValidatingReaderImpl for V1 XmlValidatingReader
        internal XmlValidatingReaderImpl( string xmlFragment, XmlNodeType fragType, XmlParserContext context )
            : this( new XmlTextReader( xmlFragment, fragType, context ) )
        { 
            if ( coreReader.BaseURI.Length > 0 ) {
                validator.BaseUri = GetResolver().ResolveUri( null, coreReader.BaseURI ); 
            } 

            if ( context != null ) { 
                parsingFunction = ParsingFunction.ParseDtdFromContext;
                parserContext = context;
            }
        } 

        // Initializes a new instance of XmlValidatingReaderImpl class for parsing fragments with the specified stream, fragment type and parser context 
        // This constructor is used when creating XmlValidatingReaderImpl for V1 XmlValidatingReader 
        internal XmlValidatingReaderImpl( Stream xmlFragment, XmlNodeType fragType, XmlParserContext context )
            : this( new XmlTextReader( xmlFragment, fragType, context ) ) 
        {
            if ( coreReader.BaseURI.Length > 0 ) {
                validator.BaseUri = GetResolver().ResolveUri( null, coreReader.BaseURI );
            } 

            if ( context != null ) { 
                parsingFunction = ParsingFunction.ParseDtdFromContext; 
                parserContext = context;
            } 
        }

        // Initializes a new instance of XmlValidatingReaderImpl class with the specified arguments.
        // This constructor is used when creating XmlValidatingReaderImpl reader via "XmlReader.Create(..)" 
        internal XmlValidatingReaderImpl( XmlReader reader, ValidationEventHandler settingsEventHandler, bool processIdentityConstraints) {
            outerReader = this; 
            coreReader = reader; 
            coreReaderImpl = reader as XmlTextReaderImpl;
            if ( coreReaderImpl == null ) { 
                XmlTextReader tr = reader as XmlTextReader;
                if ( tr != null ) {
                    coreReaderImpl = tr.Impl;
                } 
            }
            if ( coreReaderImpl == null ) { 
                throw new ArgumentException( Res.GetString( Res.Arg_ExpectingXmlTextReader ), "reader" ); 
            }
            coreReaderImpl.XmlValidatingReaderCompatibilityMode = true; 
            coreReaderNSResolver = reader as IXmlNamespaceResolver;
            this.processIdentityConstraints = processIdentityConstraints;

#pragma warning disable 618 

            schemaCollection = new XmlSchemaCollection( coreReader.NameTable ); 
 
#pragma warning restore 618
 
            schemaCollection.XmlResolver = GetResolver();

            if (settingsEventHandler == null) {
                internalEventHandler = new ValidationEventHandler( InternalValidationCallback ); 
                eventHandler = internalEventHandler;
                coreReaderImpl.ValidationEventHandler = internalEventHandler; 
            } 
            else {
                eventHandler = settingsEventHandler; 
                coreReaderImpl.ValidationEventHandler = settingsEventHandler;
            }

            validationType = ValidationType.DTD; 
            SetupValidation( ValidationType.DTD );
        } 
 
//
// XmlReader members 
//
        // Returns the current settings of the reader
        public override XmlReaderSettings Settings {
            get { 
                XmlReaderSettings settings;
                if ( coreReaderImpl.V1Compat ) { 
                    settings = null; 
                }
                else { 
                    settings = coreReader.Settings;
                }
                if ( settings != null ) {
                    settings = settings.Clone(); 
                }
                else { 
                    settings = new XmlReaderSettings(); 
                }
                settings.ValidationType = ValidationType.DTD; 
                if (!processIdentityConstraints) {
                    settings.ValidationFlags &= ~XmlSchemaValidationFlags.ProcessIdentityConstraints;
                }
                settings.ReadOnly = true; 
                return settings;
            } 
        } 

        // Returns the type of the current node. 
        public override XmlNodeType NodeType {
            get {
                return coreReader.NodeType;
            } 
        }
 
        // Returns the name of the current node, including prefix. 
        public override string Name {
            get { 
                return coreReader.Name;
            }
        }
 
        // Returns local name of the current node (without prefix)
        public override string LocalName { 
            get { 
                return coreReader.LocalName;
            } 
        }

        // Returns namespace name of the current node.
        public override string NamespaceURI { 
            get {
                return coreReader.NamespaceURI; 
            } 
        }
 
        // Returns prefix associated with the current node.
        public override string Prefix {
            get {
                return coreReader.Prefix; 
            }
        } 
 
        // Returns true if the current node can have Value property != string.Empty.
        public override bool HasValue { 
            get {
                return coreReader.HasValue;
            }
        } 

        // Returns the text value of the current node. 
        public override string Value { 
            get {
                return coreReader.Value; 
            }
        }

        // Returns the depth of the current node in the XML element stack 
        public override int Depth {
            get { 
                return coreReader.Depth; 
            }
        } 

        // Returns the base URI of the current node.
        public override string BaseURI {
            get { 
                return coreReader.BaseURI;
            } 
        } 

        // Returns true if the current node is an empty element (for example, ). 
        public override bool IsEmptyElement {
            get {
                return coreReader.IsEmptyElement;
            } 
        }
 
        // Returns true of the current node is a default attribute declared in DTD. 
        public override bool IsDefault {
            get { 
                return coreReader.IsDefault;
            }
        }
 
        // Returns the quote character used in the current attribute declaration
        public override char QuoteChar { 
            get { 
                return coreReader.QuoteChar;
            } 
        }

        // Returns the current xml:space scope.
        public override XmlSpace XmlSpace { 
            get {
                return coreReader.XmlSpace; 
            } 
        }
 
        // Returns the current xml:lang scope.
        public override string XmlLang {
            get {
                return coreReader.XmlLang; 
            }
        } 
 
        // Returns the current read state of the reader
        public override ReadState ReadState { 
            get {
                return ( parsingFunction == ParsingFunction.Init ) ? ReadState.Initial : coreReader.ReadState;
            }
        } 

        // Returns true if the reader reached end of the input data 
        public override bool EOF { 
            get {
                return coreReader.EOF; 
            }
        }

        // Returns the XmlNameTable associated with this XmlReader 
        public override XmlNameTable NameTable {
            get { 
                return coreReader.NameTable; 
            }
        } 

        // Returns encoding of the XML document
        internal Encoding Encoding {
            get { 
                return coreReaderImpl.Encoding;
            } 
        } 

 
        // Returns the number of attributes on the current node.
        public override int AttributeCount {
            get {
                return coreReader.AttributeCount; 
            }
        } 
 
        // Returns value of an attribute with the specified Name
        public override string GetAttribute( string name ) { 
            return coreReader.GetAttribute( name );
        }

        // Returns value of an attribute with the specified LocalName and NamespaceURI 
        public override string GetAttribute( string localName, string namespaceURI ) {
            return coreReader.GetAttribute( localName, namespaceURI ); 
        } 

        // Returns value of an attribute at the specified index (position) 
        public override string GetAttribute( int i ) {
            return coreReader.GetAttribute( i );
        }
 
        // Moves to an attribute with the specified Name
        public override bool MoveToAttribute( string name ) { 
            if ( !coreReader.MoveToAttribute( name ) ) { 
                return false;
            } 
            parsingFunction = ParsingFunction.Read;
            return true;
        }
 
        // Moves to an attribute with the specified LocalName and NamespceURI
        public override bool MoveToAttribute( string localName, string namespaceURI ) { 
            if ( !coreReader.MoveToAttribute( localName, namespaceURI ) ) { 
                return false;
            } 
            parsingFunction = ParsingFunction.Read;
            return true;
        }
 
        // Moves to an attribute at the specified index (position)
        public override void MoveToAttribute( int i ) { 
            coreReader.MoveToAttribute( i ); 
            parsingFunction = ParsingFunction.Read;
        } 

        // Moves to the first attribute of the current node
        public override bool MoveToFirstAttribute() {
            if ( !coreReader.MoveToFirstAttribute() ) { 
                return false;
            } 
            parsingFunction = ParsingFunction.Read; 
            return true;
        } 

        // Moves to the next attribute of the current node
        public override bool MoveToNextAttribute() {
            if ( !coreReader.MoveToNextAttribute() ) { 
                return false;
            } 
            parsingFunction = ParsingFunction.Read; 
            return true;
        } 

        // If on attribute, moves to the element that contains the attribute node
        public override bool MoveToElement() {
            if ( !coreReader.MoveToElement() ) { 
                return false;
            } 
            parsingFunction = ParsingFunction.Read; 
            return true;
        } 

        // Reads and validated next node from the input data
        public override bool Read() {
            switch ( parsingFunction ) { 
                case ParsingFunction.Read:
                    if ( coreReader.Read() ) { 
                        ProcessCoreReaderEvent(); 
                        return true;
                    } 
                    else {
                        validator.CompleteValidation();
                        return false;
                    } 
                case ParsingFunction.ParseDtdFromContext:
                    parsingFunction = ParsingFunction.Read; 
                    ParseDtdFromParserContext(); 
                    goto case ParsingFunction.Read;
                case ParsingFunction.Error: 
                case ParsingFunction.ReaderClosed:
                    return false;
                case ParsingFunction.Init:
                    parsingFunction = ParsingFunction.Read; // this changes the value returned by ReadState 
                    if ( coreReader.ReadState == ReadState.Interactive ) {
                        ProcessCoreReaderEvent(); 
                        return true; 
                    }
                    else { 
                        goto case ParsingFunction.Read;
                    }
                case ParsingFunction.ResolveEntityInternally:
                    parsingFunction = ParsingFunction.Read; 
                    ResolveEntityInternally();
                    goto case ParsingFunction.Read; 
                case ParsingFunction.InReadBinaryContent: 
                    parsingFunction = ParsingFunction.Read;
                    readBinaryHelper.Finish(); 
                    goto case ParsingFunction.Read;
                default:
                    Debug.Assert( false );
                    return false; 
            }
        } 
 
        // Closes the input stream ot TextReader, changes the ReadState to Closed and sets all properties to zero/string.Empty
        public override void Close() { 
            coreReader.Close();
            parsingFunction = ParsingFunction.ReaderClosed;
        }
 
        // Returns NamespaceURI associated with the specified prefix in the current namespace scope.
        public override String LookupNamespace( String prefix ) { 
            return coreReaderImpl.LookupNamespace( prefix ); 
        }
 
        // Iterates through the current attribute value's text and entity references chunks.
        public override bool ReadAttributeValue() {
            if ( parsingFunction == ParsingFunction.InReadBinaryContent ) {
                parsingFunction = ParsingFunction.Read; 
                readBinaryHelper.Finish();
            } 
            if (!coreReader.ReadAttributeValue()) { 
                return false;
            } 
            parsingFunction = ParsingFunction.Read;
            return true;
        }
 
        public override bool CanReadBinaryContent {
            get { 
                return true; 
            }
        } 

        public override int ReadContentAsBase64( byte[] buffer, int index, int count ) {
            if ( ReadState != ReadState.Interactive ) {
                return 0; 
            }
 
            // init ReadChunkHelper if called the first time 
            if ( parsingFunction != ParsingFunction.InReadBinaryContent ) {
                readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, outerReader ); 
            }

            // set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper
            parsingFunction = ParsingFunction.Read; 

            // call to the helper 
            int readCount = readBinaryHelper.ReadContentAsBase64( buffer, index, count ); 

            // setup parsingFunction 
            parsingFunction = ParsingFunction.InReadBinaryContent;
            return readCount;
        }
 
        public override int ReadContentAsBinHex( byte[] buffer, int index, int count ) {
            if ( ReadState != ReadState.Interactive ) { 
                return 0; 
            }
 
            // init ReadChunkHelper when called first time
            if ( parsingFunction != ParsingFunction.InReadBinaryContent ) {
                readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, outerReader );
            } 

            // set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper 
            parsingFunction = ParsingFunction.Read; 

            // call to the helper 
            int readCount = readBinaryHelper.ReadContentAsBinHex( buffer, index, count );

            // setup parsingFunction
            parsingFunction = ParsingFunction.InReadBinaryContent; 
            return readCount;
        } 
 
        public override int ReadElementContentAsBase64( byte[] buffer, int index, int count ) {
            if ( ReadState != ReadState.Interactive ) { 
                return 0;
            }

            // init ReadChunkHelper if called the first time 
            if ( parsingFunction != ParsingFunction.InReadBinaryContent ) {
                readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, outerReader ); 
            } 

            // set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper 
            parsingFunction = ParsingFunction.Read;

            // call to the helper
            int readCount = readBinaryHelper.ReadElementContentAsBase64( buffer, index, count ); 

            // setup parsingFunction 
            parsingFunction = ParsingFunction.InReadBinaryContent; 
            return readCount;
        } 

        public override int ReadElementContentAsBinHex( byte[] buffer, int index, int count ) {
            if ( ReadState != ReadState.Interactive ) {
                return 0; 
            }
 
            // init ReadChunkHelper when called first time 
            if ( parsingFunction != ParsingFunction.InReadBinaryContent ) {
                readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, outerReader ); 
            }

            // set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper
            parsingFunction = ParsingFunction.Read; 

            // call to the helper 
            int readCount = readBinaryHelper.ReadElementContentAsBinHex( buffer, index, count ); 

            // setup parsingFunction 
            parsingFunction = ParsingFunction.InReadBinaryContent;
            return readCount;
        }
 
        // Returns true if the XmlReader knows how to resolve general entities
        public override bool CanResolveEntity { 
            get { 
                return true;
            } 
        }

        // Resolves the current entity reference node
        public override void ResolveEntity() { 
            if ( parsingFunction == ParsingFunction.ResolveEntityInternally ) {
                parsingFunction = ParsingFunction.Read; 
            } 
            coreReader.ResolveEntity();
        } 

        internal XmlReader OuterReader {
            get {
                return outerReader; 
            }
            set { 
#pragma warning disable 618 
                Debug.Assert( value is XmlValidatingReader );
#pragma warning restore 618 
                outerReader = value;
            }
        }
 
        internal void MoveOffEntityReference() {
            if ( outerReader.NodeType == XmlNodeType.EntityReference && parsingFunction != ParsingFunction.ResolveEntityInternally ) { 
                if ( !outerReader.Read() ) { 
                    throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) );
                } 
            }
        }

        public override string ReadString() { 
            MoveOffEntityReference();
            return base.ReadString(); 
        } 

// 
// IXmlLineInfo members
//
        public bool HasLineInfo() {
            return true; 
        }
 
        // Returns the line number of the current node 
        public int LineNumber {
            get { 
                return ((IXmlLineInfo)coreReader).LineNumber;
            }
        }
 
        // Returns the line number of the current node
        public int LinePosition { 
            get { 
                return ((IXmlLineInfo)coreReader).LinePosition;
            } 
        }

//
// IXmlNamespaceResolver members 
//
        IDictionary IXmlNamespaceResolver.GetNamespacesInScope( XmlNamespaceScope scope ) { 
            return this.GetNamespacesInScope( scope ); 
        }
 
        string IXmlNamespaceResolver.LookupNamespace(string prefix) {
            return this.LookupNamespace( prefix );
        }
 
        string IXmlNamespaceResolver.LookupPrefix( string namespaceName ) {
            return this.LookupPrefix( namespaceName ); 
        } 

    // Internal IXmlNamespaceResolver methods 
        internal IDictionary GetNamespacesInScope( XmlNamespaceScope scope ) {
            return coreReaderNSResolver.GetNamespacesInScope( scope );
        }
 
        internal string LookupPrefix( string namespaceName ) {
            return coreReaderNSResolver.LookupPrefix( namespaceName ); 
        } 

// 
// XmlValidatingReader members
//
        // Specufies the validation event handler that wil get warnings and errors related to validation
        internal event ValidationEventHandler ValidationEventHandler { 
            add {
                eventHandler -= internalEventHandler; 
                eventHandler += value; 
                if ( eventHandler == null ) {
                    eventHandler = internalEventHandler; 
                }
                UpdateHandlers();
            }
            remove { 
                eventHandler -= value;
                if ( eventHandler == null ) { 
                    eventHandler = internalEventHandler; 
                }
                UpdateHandlers(); 
            }
        }

        // returns the schema type of the current node 
        internal object SchemaType {
            get { 
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.SchemaType property cannot be accessed on reader created via XmlReader.Create." ); 
                if ( validationType != ValidationType.None ) {
                    XmlSchemaType schemaTypeObj = coreReaderImpl.InternalSchemaType as XmlSchemaType; 
                    if ( schemaTypeObj != null && schemaTypeObj.QualifiedName.Namespace == XmlReservedNs.NsXs ) {
                        return schemaTypeObj.Datatype;
                    }
                    return coreReaderImpl.InternalSchemaType; 
                }
                else 
                    return null; 
            }
        } 

        // returns the underlying XmlTextReader or XmlTextReaderImpl
        internal XmlReader Reader {
            get { 
                return (XmlReader) coreReader;
            } 
        } 

        // returns the underlying XmlTextReaderImpl 
        internal XmlTextReaderImpl ReaderImpl {
            get {
                return coreReaderImpl;
            } 
        }
 
        // specifies the validation type (None, DDT, XSD, XDR, Auto) 
        internal ValidationType ValidationType {
            get { 
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.ValidationType property cannot be accessed on reader created via XmlReader.Create." );
                return validationType;
            }
            set { 
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.ValidationType property cannot be changed on reader created via XmlReader.Create." );
                if ( ReadState != ReadState.Initial ) { 
                    throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); 
                }
                validationType = value; 
                SetupValidation( value );
            }
        }
 
        // current schema collection used for validationg
#pragma warning disable 618 
        internal XmlSchemaCollection Schemas { 
            get {
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.Schemas property cannot be accessed on reader created via XmlReader.Create." ); 
                return schemaCollection;
            }
        }
#pragma warning restore 618 

        // Spefifies whether general entities should be automatically expanded or not 
        internal EntityHandling EntityHandling { 
            get {
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.EntityHandling property cannot be accessed on reader created via XmlReader.Create." ); 
                return coreReaderImpl.EntityHandling;
            }
            set {
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.EntityHandling property cannot be changed on reader created via XmlReader.Create." ); 
                coreReaderImpl.EntityHandling = value;
            } 
        } 

        // Specifies XmlResolver used for opening the XML document and other external references 
        internal XmlResolver XmlResolver {
            set {
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.XmlResolver property cannot be changed on reader created via XmlReader.Create." );
                coreReaderImpl.XmlResolver = value; 
                validator.XmlResolver = value;
                schemaCollection.XmlResolver = value; 
            } 
        }
 
        // Disables or enables support of W3C XML 1.0 Namespaces
        internal bool Namespaces {
            get {
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.Namespaces property cannot be accessed on reader created via XmlReader.Create." ); 
                return coreReaderImpl.Namespaces;
            } 
            set { 
                Debug.Assert( coreReaderImpl.V1Compat, "XmlValidatingReaderImpl.Namespaces property cannot be changed on reader created via XmlReader.Create." );
                coreReaderImpl.Namespaces = value; 
            }
        }

        // Returns typed value of the current node (based on the type specified by schema) 
        public object ReadTypedValue() {
            if ( validationType == ValidationType.None ) { 
                return null; 
            }
 
            switch ( outerReader.NodeType ) {
                case XmlNodeType.Attribute:
                    return coreReaderImpl.InternalTypedValue;
                case XmlNodeType.Element: 
                    if ( SchemaType == null ) {
                        return null; 
                    } 
                    XmlSchemaDatatype dtype = ( SchemaType is XmlSchemaDatatype ) ? (XmlSchemaDatatype)SchemaType : ((XmlSchemaType)SchemaType).Datatype;
                    if ( dtype != null ) { 
                        if ( !outerReader.IsEmptyElement ) {
                            for (;;) {
                                if ( !outerReader.Read() ) {
                                    throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) ); 
                                }
                                XmlNodeType type = outerReader.NodeType; 
                                if ( type != XmlNodeType.CDATA && type != XmlNodeType.Text && 
                                    type != XmlNodeType.Whitespace && type != XmlNodeType.SignificantWhitespace &&
                                    type != XmlNodeType.Comment && type != XmlNodeType.ProcessingInstruction ) { 
                                    break;
                                }
                            }
                            if ( outerReader.NodeType != XmlNodeType.EndElement ) { 
                                throw new XmlException(Res.Xml_InvalidNodeType, outerReader.NodeType.ToString());
                            } 
                        } 
                        return coreReaderImpl.InternalTypedValue;
                    } 
                    return null;

                case XmlNodeType.EndElement:
                    return null; 

                default: 
                    if ( coreReaderImpl.V1Compat ) { //If v1 XmlValidatingReader return null 
                        return null;
                    } 
                    else {
                        return Value;
                    }
            } 
        }
 
// 
// Private implementation methods
// 

        private void ParseDtdFromParserContext()
        {
            Debug.Assert( parserContext != null ); 
            Debug.Assert( coreReaderImpl.DtdSchemaInfo == null );
 
            if ( parserContext.DocTypeName == null || parserContext.DocTypeName.Length == 0 ) { 
                return;
            } 

            coreReaderImpl.DtdSchemaInfo = DtdParser.Parse( coreReaderImpl, parserContext.BaseURI, parserContext.DocTypeName, parserContext.PublicId,
                                                            parserContext.SystemId, parserContext.InternalSubset );
            ValidateDtd(); 
        }
 
        private void ValidateDtd() { 
            SchemaInfo dtdSchemaInfo = coreReaderImpl.DtdSchemaInfo;
            if ( dtdSchemaInfo != null ) { 
                switch ( validationType ) {
#pragma warning disable 618
                    case ValidationType.Auto:
                        SetupValidation( ValidationType.DTD ); 
                        goto case ValidationType.DTD;
#pragma warning restore 618 
                    case ValidationType.DTD: 
                    case ValidationType.None:
                        validator.SchemaInfo = dtdSchemaInfo; 
                        break;
                }
            }
        } 

        private void ResolveEntityInternally() { 
            Debug.Assert( coreReader.NodeType == XmlNodeType.EntityReference ); 
            int initialDepth = coreReader.Depth;
            outerReader.ResolveEntity(); 
            while ( outerReader.Read() && coreReader.Depth > initialDepth );
        }

        private void UpdateHandlers() { 
            validator.EventHandler = eventHandler;
            coreReaderImpl.ValidationEventHandler = ( validationType != ValidationType.None ) ? eventHandler : null; 
        } 

        private void SetupValidation( ValidationType valType ) { 
            validator = BaseValidator.CreateInstance( valType, this, schemaCollection, eventHandler , processIdentityConstraints);

            XmlResolver resolver = GetResolver();
            validator.XmlResolver = resolver; 

            if ( outerReader.BaseURI.Length > 0 ) { 
                validator.BaseUri = ( resolver == null ) ? new Uri( outerReader.BaseURI, UriKind.RelativeOrAbsolute ) : resolver.ResolveUri( null, outerReader.BaseURI ); 
            }
 
            UpdateHandlers();
        }

        // This is needed because we can't have the setter for XmlResolver public and with internal getter. 
        private XmlResolver GetResolver() {
            return coreReaderImpl.GetResolver(); 
        } 

        private void InternalValidationCallback( object sender, ValidationEventArgs e ) { 
            if ( validationType != ValidationType.None && e.Severity == XmlSeverityType.Error ) {
                throw e.Exception;
            }
        } 

// 
// Internal methods for validators, DOM, XPathDocument etc. 
//
        private void ProcessCoreReaderEvent() { 
            switch ( coreReader.NodeType ) {
                case XmlNodeType.Whitespace:
                    if ( coreReader.Depth > 0 || coreReaderImpl.FragmentType != XmlNodeType.Document ) {
                        if ( validator.PreserveWhitespace ) { 
                            coreReaderImpl.ChangeCurrentNodeType( XmlNodeType.SignificantWhitespace );
                        } 
                    } 
                    goto default;
                case XmlNodeType.DocumentType: 
                    ValidateDtd();
                    break;
                case XmlNodeType.EntityReference:
                    parsingFunction = ParsingFunction.ResolveEntityInternally; 
                    goto default;
                default: 
                    coreReaderImpl.InternalSchemaType = null; 
                    coreReaderImpl.InternalTypedValue = null;
                    validator.Validate(); 
                    break;
            }
        }
 
        internal void Close( bool closeStream ) {
            coreReaderImpl.Close( closeStream ); 
            parsingFunction = ParsingFunction.ReaderClosed; 
        }
 
        internal BaseValidator Validator {
            get {
                return validator;
            } 
            set {
                validator = value; 
            } 
        }
 
        internal override XmlNamespaceManager NamespaceManager {
            get {
                return coreReaderImpl.NamespaceManager;
            } 
        }
 
        internal bool StandAlone { 
            get {
                return coreReaderImpl.StandAlone; 
            }
        }

        internal object SchemaTypeObject { 
            set {
                coreReaderImpl.InternalSchemaType = value; 
            } 
        }
 
        internal object TypedValueObject {
            get {
                return coreReaderImpl.InternalTypedValue;
            } 
            set {
                coreReaderImpl.InternalTypedValue = value; 
            } 
        }
 
        internal bool Normalization {
            get {
                return coreReaderImpl.Normalization;
            } 
        }
 
        internal bool AddDefaultAttribute( SchemaAttDef attdef ) { 
            return coreReaderImpl.AddDefaultAttribute( attdef, false );
        } 

        internal SchemaInfo GetSchemaInfo() {
            return validator.SchemaInfo;
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.


                        

                        

                        
                        

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