xdrvalidator.cs source code in C# .NET

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/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / schema / xdrvalidator.cs / 1 / xdrvalidator.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace System.Xml.Schema { 

    using System.IO; 
    using System.Text;
    using System.Collections;
    using System.Diagnostics;
    using System.Globalization; 

#pragma warning disable 618 
    internal sealed class XdrValidator : BaseValidator { 

        private const int        STACK_INCREMENT = 10; 
        private HWStack          validationStack;  // validaton contexts
        private Hashtable        attPresence;
        private XmlQualifiedName name = XmlQualifiedName.Empty;
        private XmlNamespaceManager  nsManager; 
        private bool isProcessContents = false;
        private Hashtable       IDs; 
        private IdRefNode       idRefListHead; 
        private Parser  inlineSchemaParser = null;
        private const string     x_schema = "x-schema:"; 

        internal XdrValidator(BaseValidator validator) : base(validator) {
            Init();
        } 

        internal XdrValidator(XmlValidatingReaderImpl reader, XmlSchemaCollection schemaCollection, ValidationEventHandler eventHandler) : base(reader, schemaCollection, eventHandler) { 
            Init(); 
        }
 
        private void Init() {
            nsManager = reader.NamespaceManager;
            if (nsManager == null) {
                nsManager = new XmlNamespaceManager(NameTable); 
                isProcessContents = true;
            } 
            validationStack = new HWStack(STACK_INCREMENT); 
            textValue = new StringBuilder();
            name = XmlQualifiedName.Empty; 
            attPresence = new Hashtable();
            Push(XmlQualifiedName.Empty);
            schemaInfo = new SchemaInfo();
            checkDatatype = false; 
        }
 
        public override void Validate() { 
            if (IsInlineSchemaStarted) {
                ProcessInlineSchema(); 
            }
            else {
                switch (reader.NodeType) {
                    case XmlNodeType.Element: 
                        ValidateElement();
                        if (reader.IsEmptyElement) { 
                            goto case XmlNodeType.EndElement; 
                        }
                        break; 
                    case XmlNodeType.Whitespace:
                        ValidateWhitespace();
                        break;
                    case XmlNodeType.Text:          // text inside a node 
                    case XmlNodeType.CDATA:         // 
                    case XmlNodeType.SignificantWhitespace: 
                        ValidateText(); 
                        break;
                    case XmlNodeType.EndElement: 
                        ValidateEndElement();
                        break;
                }
            } 
        }
 
        private void ValidateElement() { 
            elementName.Init(reader.LocalName, XmlSchemaDatatype.XdrCanonizeUri(reader.NamespaceURI, NameTable, SchemaNames));
            ValidateChildElement(); 
            if (SchemaNames.IsXDRRoot(elementName.Name, elementName.Namespace) && reader.Depth > 0) {
                inlineSchemaParser = new Parser(SchemaType.XDR, NameTable, SchemaNames, EventHandler);
                inlineSchemaParser.StartParsing(reader, null);
                inlineSchemaParser.ParseReaderNode(); 
            }
            else { 
                ProcessElement(); 
            }
        } 

        private void ValidateChildElement() {
            if (context.NeedValidateChildren) {
                int errorCode = 0; 
                context.ElementDecl.ContentValidator.ValidateElement(elementName, context, out errorCode);
                if (errorCode < 0) { 
                    XmlSchemaValidator.ElementValidationError(elementName, context, EventHandler, reader, reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition, false); 
                }
            } 
        }

        private bool IsInlineSchemaStarted {
            get { return inlineSchemaParser != null; } 
        }
 
        private void ProcessInlineSchema() { 
            if (!inlineSchemaParser.ParseReaderNode()) { // Done
                    inlineSchemaParser.FinishParsing(); 
                    SchemaInfo xdrSchema = inlineSchemaParser.XdrSchema;
                    if (xdrSchema != null && xdrSchema.ErrorCount == 0) {
                        foreach(string inlineNS in xdrSchema.TargetNamespaces.Keys) {
                            if (!SchemaInfo.HasSchema(inlineNS)) { 
                                schemaInfo.Add(xdrSchema, EventHandler);
                                SchemaCollection.Add(inlineNS, xdrSchema, null, false); 
                                break; 
                            }
                        } 
                    }
                    inlineSchemaParser = null;
            }
        } 

        private void ProcessElement() { 
            Push(elementName); 
            if (isProcessContents) {
                nsManager.PopScope(); 
            }
            context.ElementDecl = ThoroughGetElementDecl();
            if (context.ElementDecl != null) {
                ValidateStartElement(); 
                ValidateEndStartElement();
                context.NeedValidateChildren = true; 
                context.ElementDecl.ContentValidator.InitValidation(context); 
            }
        } 

         private void ValidateEndElement() {
            if (isProcessContents) {
                nsManager.PopScope(); 
            }
            if (context.ElementDecl != null) { 
                if (context.NeedValidateChildren) { 
                    if(!context.ElementDecl.ContentValidator.CompleteValidation(context)) {
                        XmlSchemaValidator.CompleteValidationError(context, EventHandler, reader, reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition, false); 
                    }
                }
                if (checkDatatype) {
                    string stringValue = !hasSibling ? textString : textValue.ToString();  // only for identity-constraint exception reporting 
                    CheckValue(stringValue, null);
                    checkDatatype = false; 
                    textValue.Length = 0; // cleanup 
                    textString = string.Empty;
                } 
            }
            Pop();

        } 

 
        private SchemaElementDecl ThoroughGetElementDecl() { 
            if (reader.Depth == 0) {
                LoadSchema(string.Empty); 
            }
            if (reader.MoveToFirstAttribute()) {
                do {
                    string objectNs = reader.NamespaceURI; 
                    string objectName = reader.LocalName;
                    if (Ref.Equal(objectNs, SchemaNames.NsXmlNs)) { 
                        LoadSchema(reader.Value); 
                        if (isProcessContents) {
                            nsManager.AddNamespace(reader.Prefix.Length == 0 ? string.Empty : reader.LocalName, reader.Value); 
                        }
                    }
                    if (
                        Ref.Equal(objectNs, SchemaNames.QnDtDt.Namespace) && 
                        Ref.Equal(objectName, SchemaNames.QnDtDt.Name)
                    ) { 
                        reader.SchemaTypeObject = XmlSchemaDatatype.FromXdrName(reader.Value); 
                    }
 
                } while(reader.MoveToNextAttribute());
                reader.MoveToElement();
            }
            SchemaElementDecl elementDecl = schemaInfo.GetElementDecl(elementName); 
            if(elementDecl == null) {
                if(schemaInfo.TargetNamespaces.Contains(context.Namespace)) { 
                    SendValidationEvent(Res.Sch_UndeclaredElement, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace)); 
                }
            } 
            return elementDecl;
        }

        private void ValidateStartElement() { 
            if (context.ElementDecl != null) {
                if (context.ElementDecl.SchemaType != null) { 
                    reader.SchemaTypeObject =  context.ElementDecl.SchemaType; 
                }
                else { 
                    reader.SchemaTypeObject =  context.ElementDecl.Datatype;
                }
                if (reader.IsEmptyElement && !context.IsNill && context.ElementDecl.DefaultValueTyped != null) {
                   reader.TypedValueObject = context.ElementDecl.DefaultValueTyped; 
                   context.IsNill = true; // reusing IsNill
                } 
                if (this.context.ElementDecl.HasRequiredAttribute) { 
                    attPresence.Clear();
                } 
            }

            if (reader.MoveToFirstAttribute()) {
                do { 
                    if ((object)reader.NamespaceURI == (object)SchemaNames.NsXmlNs) {
                        continue; 
                    } 

                    try { 
                        reader.SchemaTypeObject = null;
                        SchemaAttDef attnDef = schemaInfo.GetAttributeXdr(context.ElementDecl, QualifiedName(reader.LocalName, reader.NamespaceURI));
                        if (attnDef != null) {
                            if (context.ElementDecl != null && context.ElementDecl.HasRequiredAttribute) { 
                                attPresence.Add(attnDef.Name, attnDef);
                            } 
                            reader.SchemaTypeObject = (attnDef.SchemaType != null) ? (object)attnDef.SchemaType : (object)attnDef.Datatype; 
                            if (attnDef.Datatype != null) {
                                string attributeValue = reader.Value; 
                                // need to check the contents of this attribute to make sure
                                // it is valid according to the specified attribute type.
                                CheckValue(attributeValue, attnDef);
                            } 
                        }
                    } 
                    catch (XmlSchemaException e) { 
                        e.SetSource(reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition);
                        SendValidationEvent(e); 
                    }
                } while(reader.MoveToNextAttribute());
                reader.MoveToElement();
            } 
        }
 
        private void ValidateEndStartElement() { 

            if (context.ElementDecl.HasDefaultAttribute) { 
                foreach (SchemaAttDef attdef in context.ElementDecl.DefaultAttDefs) {
                    reader.AddDefaultAttribute(attdef);
               }
            } 
            if (context.ElementDecl.HasRequiredAttribute) {
                try { 
                    context.ElementDecl.CheckAttributes(attPresence, reader.StandAlone); 
                }
                catch (XmlSchemaException e) { 
                    e.SetSource(reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition);
                    SendValidationEvent(e);
                }
 
            }
            if (context.ElementDecl.Datatype != null) { 
                checkDatatype = true; 
                hasSibling = false;
                textString = string.Empty; 
                textValue.Length = 0;
            }
        }
 
        private void LoadSchemaFromLocation(string uri) {
            // is x-schema 
            if (!XdrBuilder.IsXdrSchema(uri)) { 
                return;
            } 
            string url = uri.Substring(x_schema.Length);
            XmlReader reader = null;
            SchemaInfo xdrSchema = null;
            try { 
                Uri ruri = this.XmlResolver.ResolveUri(BaseUri, url);
                Stream stm = (Stream)this.XmlResolver.GetEntity(ruri,null,null); 
                reader = new XmlTextReader(ruri.ToString(), stm, NameTable); 
                ((XmlTextReader)reader).XmlResolver = this.XmlResolver;
                Parser parser = new Parser(SchemaType.XDR, NameTable, SchemaNames, EventHandler); 
                parser.XmlResolver = this.XmlResolver;
                parser.Parse(reader, uri);
                while(reader.Read());// wellformness check
                xdrSchema = parser.XdrSchema; 
            }
            catch(XmlSchemaException e) { 
                SendValidationEvent(Res.Sch_CannotLoadSchema, new string[] {uri, e.Message}, XmlSeverityType.Error); 
            }
            catch(Exception e) { 
                SendValidationEvent(Res.Sch_CannotLoadSchema, new string[] {uri, e.Message}, XmlSeverityType.Warning);
            }
            finally {
                if (reader != null) { 
                    reader.Close();
                } 
            } 
            if (xdrSchema != null && xdrSchema.ErrorCount == 0) {
                schemaInfo.Add(xdrSchema, EventHandler); 
                SchemaCollection.Add(uri, xdrSchema, null, false);
            }
        }
 
        private void LoadSchema(string uri) {
            if (SchemaInfo.TargetNamespaces.Contains(uri)) { 
                return; 
            }
            if (this.XmlResolver == null) { 
                return;
            }

            SchemaInfo schemaInfo = null; 
            if (SchemaCollection != null)
                schemaInfo = SchemaCollection.GetSchemaInfo(uri); 
            if (schemaInfo != null) { 
                if(schemaInfo.SchemaType != SchemaType.XDR) {
                    throw new XmlException(Res.Xml_MultipleValidaitonTypes, string.Empty, this.PositionInfo.LineNumber, this.PositionInfo.LinePosition); 
                }
                SchemaInfo.Add(schemaInfo, EventHandler);
                return;
            } 
            LoadSchemaFromLocation(uri);
        } 
 
        private bool HasSchema { get { return schemaInfo.SchemaType != SchemaType.None;}}
 
        public override bool PreserveWhitespace {
            get { return context.ElementDecl != null ? context.ElementDecl.ContentValidator.PreserveWhitespace : false; }
        }
 
        void ProcessTokenizedType(
            XmlTokenizedType    ttype, 
            string              name 
        ) {
            switch(ttype) { 
            case XmlTokenizedType.ID:
                if (FindId(name) != null) {
                    SendValidationEvent(Res.Sch_DupId, name);
                } 
                else {
                    AddID(name, context.LocalName); 
                } 
                break;
            case XmlTokenizedType.IDREF: 
                object p = FindId(name);
                if (p == null) { // add it to linked list to check it later
                    idRefListHead = new IdRefNode(idRefListHead, name, this.PositionInfo.LineNumber, this.PositionInfo.LinePosition);
                } 
                break;
            case XmlTokenizedType.ENTITY: 
                ProcessEntity(schemaInfo, name, this, EventHandler, reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition); 
                break;
            default: 
                break;
            }
        }
 

        public override void CompleteValidation() { 
            if (HasSchema) { 
                CheckForwardRefs();
            } 
            else {
                SendValidationEvent(new XmlSchemaException(Res.Xml_NoValidation, string.Empty), XmlSeverityType.Warning);
            }
        } 

 
        private void CheckValue( 
            string              value,
            SchemaAttDef        attdef 
        ) {
            try {
                reader.TypedValueObject = null;
                bool isAttn = attdef != null; 
                XmlSchemaDatatype dtype = isAttn ? attdef.Datatype : context.ElementDecl.Datatype;
                if (dtype == null) { 
                    return; // no reason to check 
                }
 
                if (dtype.TokenizedType != XmlTokenizedType.CDATA) {
                    value = value.Trim();
                }
                if (value.Length == 0) { 
                    return; // don't need to check
                } 
 

                object typedValue = dtype.ParseValue(value, NameTable, nsManager); 
                reader.TypedValueObject = typedValue;
                // Check special types
                XmlTokenizedType ttype = dtype.TokenizedType;
                if (ttype == XmlTokenizedType.ENTITY || ttype == XmlTokenizedType.ID || ttype == XmlTokenizedType.IDREF) { 
                    if (dtype.Variety == XmlSchemaDatatypeVariety.List) {
                        string[] ss = (string[])typedValue; 
                        foreach(string s in ss) { 
                            ProcessTokenizedType(dtype.TokenizedType, s);
                        } 
                    }
                    else {
                        ProcessTokenizedType(dtype.TokenizedType, (string)typedValue);
                    } 
                }
 
                SchemaDeclBase decl = isAttn ? (SchemaDeclBase)attdef : (SchemaDeclBase)context.ElementDecl; 

                if (decl.MaxLength != uint.MaxValue) { 
                    if(value.Length > decl.MaxLength) {
                        SendValidationEvent(Res.Sch_MaxLengthConstraintFailed, value);
                    }
                } 
                if (decl.MinLength != uint.MaxValue) {
                    if(value.Length < decl.MinLength) { 
                        SendValidationEvent(Res.Sch_MinLengthConstraintFailed, value); 
                    }
                } 
                if (decl.Values != null && !decl.CheckEnumeration(typedValue)) {
                    if (dtype.TokenizedType == XmlTokenizedType.NOTATION) {
                        SendValidationEvent(Res.Sch_NotationValue, typedValue.ToString());
                    } 
                    else {
                        SendValidationEvent(Res.Sch_EnumerationValue, typedValue.ToString()); 
                    } 

                } 
                if (!decl.CheckValue(typedValue)) {
                    if (isAttn) {
                        SendValidationEvent(Res.Sch_FixedAttributeValue, attdef.Name.ToString());
                    } 
                    else {
                        SendValidationEvent(Res.Sch_FixedElementValue, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace)); 
                    } 
                }
            } 
            catch (XmlSchemaException) {
                if (attdef != null) {
                    SendValidationEvent(Res.Sch_AttributeValueDataType, attdef.Name.ToString());
                } 
                else {
                    SendValidationEvent(Res.Sch_ElementValueDataType, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace)); 
                } 
            }
        } 

        public static void CheckDefaultValue(
            string              value,
            SchemaAttDef        attdef, 
            SchemaInfo          sinfo,
            XmlNamespaceManager     nsManager, 
            XmlNameTable        NameTable, 
            object              sender,
            ValidationEventHandler  eventhandler, 
            string              baseUri,
            int                 lineNo,
            int                 linePos
        ) { 
            try {
 
                XmlSchemaDatatype dtype = attdef.Datatype; 
                if (dtype == null) {
                    return; // no reason to check 
                }

                if (dtype.TokenizedType != XmlTokenizedType.CDATA) {
                    value = value.Trim(); 
                }
                if (value.Length == 0) { 
                    return; // don't need to check 
                }
                object typedValue = dtype.ParseValue(value, NameTable, nsManager); 

                // Check special types
                XmlTokenizedType ttype = dtype.TokenizedType;
                if (ttype == XmlTokenizedType.ENTITY) { 
                    if (dtype.Variety == XmlSchemaDatatypeVariety.List) {
                        string[] ss = (string[])typedValue; 
                        foreach(string s in ss) { 
                            ProcessEntity(sinfo, s, sender, eventhandler, baseUri, lineNo, linePos);
                        } 
                    }
                    else {
                        ProcessEntity(sinfo, (string)typedValue, sender, eventhandler, baseUri, lineNo, linePos);
                    } 
                }
                else if (ttype == XmlTokenizedType.ENUMERATION) { 
                    if (!attdef.CheckEnumeration(typedValue)) { 
                        XmlSchemaException e = new XmlSchemaException(Res.Sch_EnumerationValue, typedValue.ToString(), baseUri, lineNo, linePos);
                        if (eventhandler != null) { 
                            eventhandler(sender, new ValidationEventArgs(e));
                        }
                        else {
                            throw e; 
                        }
                    } 
                } 
                attdef.DefaultValueTyped = typedValue;
            } 
#if DEBUG
            catch (XmlSchemaException ex) {
                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, ex.Message);
#else 
            catch  {
#endif 
                XmlSchemaException e = new XmlSchemaException(Res.Sch_AttributeDefaultDataType, attdef.Name.ToString(), baseUri, lineNo, linePos); 
                if (eventhandler != null) {
                    eventhandler(sender, new ValidationEventArgs(e)); 
                }
                else {
                    throw e;
                } 
            }
        } 
 
        internal void AddID(string name, object node) {
            // Note: It used to be true that we only called this if _fValidate was true, 
            // but due to the fact that you can now dynamically type somethign as an ID
            // that is no longer true.
            if (IDs == null) {
                IDs = new Hashtable(); 
            }
 
            IDs.Add(name, node); 
        }
 
        public override object  FindId(string name) {
            return IDs == null ? null : IDs[name];
        }
 
        private    void Push(XmlQualifiedName elementName) {
            context = (ValidationState)validationStack.Push(); 
            if (context == null) { 
                context = new ValidationState();
                validationStack.AddToTop(context); 
            }
            context.LocalName = elementName.Name;
            context.Namespace = elementName.Namespace;
            context.HasMatched = false; 
            context.IsNill = false;
            context.NeedValidateChildren = false; 
        } 

        private    void Pop() { 
            if (validationStack.Length > 1) {
                validationStack.Pop();
                context = (ValidationState)validationStack.Peek();
            } 
        }
 
        private void CheckForwardRefs() { 
            IdRefNode next = idRefListHead;
            while (next != null) { 
                if(FindId(next.Id) == null) {
                    SendValidationEvent(new XmlSchemaException(Res.Sch_UndeclaredId, next.Id, reader.BaseURI, next.LineNo, next.LinePos));
                }
                IdRefNode ptr = next.Next; 
                next.Next = null; // unhook each object so it is cleaned up by Garbage Collector
                next = ptr; 
            } 
            // not needed any more.
            idRefListHead = null; 
        }

        private XmlQualifiedName QualifiedName(string name, string ns) {
            return new XmlQualifiedName(name, XmlSchemaDatatype.XdrCanonizeUri(ns, NameTable, SchemaNames)); 
        }
 
    }; 
#pragma warning restore 618
} 


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

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