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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / Xml / XmlWrappingReader.cs / 1305376 / XmlWrappingReader.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // //// Provides a class used to wrap XmlReader instances. // // // @owner [....] //--------------------------------------------------------------------- namespace System.Data.Services.Client.Xml { #region Namespaces. using System.Xml; using System.Xml.Schema; using System.Collections.Generic; using System.Diagnostics; #endregion Namespaces. ///Use this class to wrap an existing internal class XmlWrappingReader : XmlReader, IXmlLineInfo { #region Private fields. ///. Wrapper reader. private XmlReader reader; ///Line information of the wrapper reader (possibly null). private IXmlLineInfo readerAsIXmlLineInfo; ///stack to keep track of the base uri. private StackxmlBaseStack; /// while creating a nested reader, we need to use the base uri from the previous reader. This field is used for that purpose. private string previousReaderBaseUri; #endregion Private fields. ///Initializes a new /// Reader to wrap. internal XmlWrappingReader(XmlReader baseReader) { this.Reader = baseReader; } #region Properties. ///instance. Gets the number of attributes on the current node. public override int AttributeCount { get { return this.reader.AttributeCount; } } ///Gets the base URI of the current node. public override string BaseURI { get { if (this.xmlBaseStack != null && this.xmlBaseStack.Count > 0) { return this.xmlBaseStack.Peek().BaseUri.AbsoluteUri; } else if (!String.IsNullOrEmpty(this.previousReaderBaseUri)) { return this.previousReaderBaseUri; } return this.reader.BaseURI; } } ///Gets a value indicating whether this reader can parse and resolve entities. public override bool CanResolveEntity { get { return this.reader.CanResolveEntity; } } ///Gets the depth of the current node in the XML document. public override int Depth { get { return this.reader.Depth; } } // NOTE: there is no support for wrapping the DtdSchemaInfo property. ///Gets a value indicating whether the reader is positioned at the end of the stream. public override bool EOF { get { return this.reader.EOF; } } ///Gets a value indicating whether the current node has any attributes. public override bool HasAttributes { get { return this.reader.HasAttributes; } } ///Gets a value indicating whether the current node can have a public override bool HasValue { get { return this.reader.HasValue; } } ///. /// Gets a value indicating whether the current node is an attribute that was generated from the default value /// defined in the DTD or schema. /// public override bool IsDefault { get { return this.reader.IsDefault; } } ///Gets a value indicating whether the current node is an empty element. public override bool IsEmptyElement { get { return this.reader.IsEmptyElement; } } ///Gets the current line number. public virtual int LineNumber { get { if (this.readerAsIXmlLineInfo != null) { return this.readerAsIXmlLineInfo.LineNumber; } return 0; } } ///Gets the current line position. public virtual int LinePosition { get { if (this.readerAsIXmlLineInfo != null) { return this.readerAsIXmlLineInfo.LinePosition; } return 0; } } ///Gets the local name of the current node. public override string LocalName { get { return this.reader.LocalName; } } ///Gets the qualified name of the current node. public override string Name { get { return this.reader.Name; } } ///Gets the namespace URI (as defined in the W3C Namespace specification) of the node on which the reader is positioned. public override string NamespaceURI { get { return this.reader.NamespaceURI; } } ///Gets the XmlNameTable associated with this implementation. public override XmlNameTable NameTable { get { return this.reader.NameTable; } } ///Gets the type of the current node. public override XmlNodeType NodeType { get { return this.reader.NodeType; } } ///Gets the namespace prefix associated with the current node. public override string Prefix { get { return this.reader.Prefix; } } #if !ASTORIA_LIGHT ///Gets the quotation mark character used to enclose the value of an attribute node. public override char QuoteChar { get { return this.reader.QuoteChar; } } #endif ///Gets the state of the reader. public override ReadState ReadState { get { return this.reader.ReadState; } } #if !ASTORIA_LIGHT ///Gets the schema information that has been assigned to the current node as a result of schema validation. public override IXmlSchemaInfo SchemaInfo { get { return this.reader.SchemaInfo; } } #endif ///Gets the XmlReaderSettings object used to create this XmlReader instance. public override XmlReaderSettings Settings { get { return this.reader.Settings; } } ///Gets the text value of the current node. public override string Value { get { return this.reader.Value; } } ///Gets the Common Language Runtime (CLR) type for the current node. public override Type ValueType { get { return this.reader.ValueType; } } ///Gets the current xml:lang scope. public override string XmlLang { get { return this.reader.XmlLang; } } ///Gets the current xml:space scope. public override XmlSpace XmlSpace { get { return this.reader.XmlSpace; } } ///Wrapped reader. protected XmlReader Reader { get { return this.reader; } set { this.reader = value; this.readerAsIXmlLineInfo = value as IXmlLineInfo; } } #endregion Properties. #region Methods. ///Changes the ReadState to Closed. public override void Close() { this.reader.Close(); } ///Gets the value of the attribute with the specified index. /// The index of the attribute. The index is zero-based. (The first attribute has index 0.) ///The value of the specified attribute. This method does not move the reader. public override string GetAttribute(int i) { return this.reader.GetAttribute(i); } ///Gets the value of the attribute with the specified name. /// The qualified name of the attribute. ////// The value of the specified attribute. If the attribute is not found or the value is String.Empty, /// a null reference is returned. /// public override string GetAttribute(string name) { return this.reader.GetAttribute(name); } ///Gets the value of the attribute with the specified index. /// The local name of the attribute. /// The namespace URI of the attribute. ////// The value of the specified attribute. If the attribute is not found or the value is String.Empty, /// a null reference is returned. /// public override string GetAttribute(string name, string namespaceURI) { return this.reader.GetAttribute(name, namespaceURI); } ///Gets a value indicating whether the class can return line information. ///true if LineNumber and LinePosition can be provided; otherwise, false. public virtual bool HasLineInfo() { return ((this.readerAsIXmlLineInfo != null) && this.readerAsIXmlLineInfo.HasLineInfo()); } ///Resolves a namespace prefix in the current element's scope. /// /// The prefix whose namespace URI you want to resolve. To match the default namespace, pass an empty string. /// ///The namespace URI to which the prefix maps or a null reference. public override string LookupNamespace(string prefix) { return this.reader.LookupNamespace(prefix); } ///Moves to the attribute with the specified index. /// The index of the attribute. public override void MoveToAttribute(int i) { this.reader.MoveToAttribute(i); } ///Moves to the attribute with the specified name. /// The qualified name of the attribute. ////// true if the attribute is found; otherwise, false. If false, the reader's position does not change. /// public override bool MoveToAttribute(string name) { return this.reader.MoveToAttribute(name); } ///Moves to the attribute with the specified name. /// The local name of the attribute. /// The namespace URI of the attribute. ////// true if the attribute is found; otherwise, false. If false, the reader's position does not change. /// public override bool MoveToAttribute(string name, string ns) { return this.reader.MoveToAttribute(name, ns); } ///Moves to the element that contains the current attribute node. ////// true if the reader is positioned on an attribute (the reader moves to the element that owns the attribute); /// false if the reader is not positioned on an attribute (the position of the reader does not change). /// public override bool MoveToElement() { return this.reader.MoveToElement(); } ///Moves to the first attribute. ////// true if an attribute exists (the reader moves to the first attribute); otherwise, false (the position of /// the reader does not change). /// public override bool MoveToFirstAttribute() { return this.reader.MoveToFirstAttribute(); } ///Moves to the next attribute. ///true if there is a next attribute; false if there are no more attributes. public override bool MoveToNextAttribute() { return this.reader.MoveToNextAttribute(); } ///Reads the next node from the stream. ///true if the next node was read successfully; false if there are no more nodes to read. public override bool Read() { if (this.reader.NodeType == XmlNodeType.EndElement) { this.PopXmlBase(); } else { // If the xmlreader is located at the attributes, IsEmptyElement will always return false. // Hence we need to call MoveToElement first, before checking for IsEmptyElement this.reader.MoveToElement(); if (this.reader.IsEmptyElement) { this.PopXmlBase(); } } bool result = this.reader.Read(); if (result) { if (this.reader.NodeType == XmlNodeType.Element && this.reader.HasAttributes) { string baseAttribute = this.reader.GetAttribute(XmlConstants.XmlBaseAttributeNameWithPrefix); if (String.IsNullOrEmpty(baseAttribute)) { // If there is no xml base attribute specified, don't do anything return result; } Uri newBaseUri = null; newBaseUri = Util.CreateUri(baseAttribute, UriKind.RelativeOrAbsolute); // Initialize the stack first time you see the xml base uri if (this.xmlBaseStack == null) { this.xmlBaseStack = new Stack(); } if (this.xmlBaseStack.Count > 0) { // If there is a xml:base attribute already specified, then the new xml base // value must be relative to the previous xml base. // For more information, look into section 3 of the following RFC // http://www.w3.org/TR/2001/REC-xmlbase-20010627/ newBaseUri = Util.CreateUri(this.xmlBaseStack.Peek().BaseUri, newBaseUri); } // Push current state and allocate new one this.xmlBaseStack.Push(new XmlBaseState(newBaseUri, this.reader.Depth)); } } return result; } /// Parses the attribute value into one or more Text, EntityReference, or EndEntity nodes. ///true if there are nodes to return. public override bool ReadAttributeValue() { return this.reader.ReadAttributeValue(); } ///Resolves the entity reference for EntityReference nodes. public override void ResolveEntity() { this.reader.ResolveEntity(); } ///Skips the children of the current node. public override void Skip() { this.reader.Skip(); } ////// Creates a new instance of XmlWrappingReader instance which wraps the /// current base uri. /// xml reader which needs to be wrapped. ////// a new instance of XmlWrappingReader. internal static XmlWrappingReader CreateReader(string currentBaseUri, XmlReader newReader) { Debug.Assert(!(newReader is XmlWrappingReader), "The new reader must not be a xmlWrappingReader"); XmlWrappingReader reader = new XmlWrappingReader(newReader); reader.previousReaderBaseUri = currentBaseUri; return reader; } ////// Releases the unmanaged resources used by the XmlReader and optionally releases the managed resources. /// /// /// true to release both managed and unmanaged resources; false to release only unmanaged resources. /// protected override void Dispose(bool disposing) { if (this.reader != null) { ((IDisposable)this.reader).Dispose(); } // XmlReader.Dispose(bool) does nothing, but for completeness w/ FxCop base.Dispose(disposing); } ////// Pops the xml base from the top of the stack, if required. /// private void PopXmlBase() { if (this.xmlBaseStack != null && this.xmlBaseStack.Count > 0 && this.reader.Depth == this.xmlBaseStack.Peek().Depth) { this.xmlBaseStack.Pop(); } } #endregion Methods. #region Private Class ////// Private class to maintain the state information for keeping track of base uri's. /// private class XmlBaseState { ////// Creates a new instance of the XmlBaseState class. /// /// base uri for the given element. /// depth of the element. internal XmlBaseState(Uri baseUri, int depth) { this.BaseUri = baseUri; this.Depth = depth; } ///base uri as specified in the xmml:base attribute of the given element. public Uri BaseUri { get; private set; } ///depth of the element. public int Depth { get; private set; } } #endregion // Private Class } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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