XmlUtil.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / XmlUtil.cs / 1 / XmlUtil.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
// static xml utility functions
//  
//--------------------------------------------------------------------- 

#if ASTORIA_CLIENT 
namespace System.Data.Services.Client
#else
namespace System.Data.Services
#endif 
{
    using System.Diagnostics; 
    using System.Globalization; 
    using System.IO;
    using System.Text; 
    using System.Xml;

    /// 
    /// static uri utility functions 
    /// 
    internal static partial class UriUtil 
    { 
        /// Creates a URI suitable for host-agnostic comparison purposes.
        /// URI to compare. 
        /// URI suitable for comparison.
        private static Uri CreateBaseComparableUri(Uri uri)
        {
            Debug.Assert(uri != null, "uri != null"); 

            uri = new Uri(uri.OriginalString.ToUpper(CultureInfo.InvariantCulture), UriKind.RelativeOrAbsolute); 
 
            UriBuilder builder = new UriBuilder(uri);
            builder.Host = "h"; 
            builder.Port = 80;
            builder.Scheme = "http";
            return builder.Uri;
        } 

        /// Parse the atom link relation attribute value 
        /// atom link relation attribute value 
        /// the assocation name or null
        internal static string GetNameFromAtomLinkRelationAttribute(string value) 
        {
            string name = null;
            if (!String.IsNullOrEmpty(value))
            { 
                Uri uri = null;
                try 
                { 
                    uri = new Uri(value, UriKind.RelativeOrAbsolute);
                } 
                catch (UriFormatException)
                {   // ignore the exception, obviously we don't have our expected relation value
                }
 
                if ((null != uri) && uri.IsAbsoluteUri)
                { 
                    string unescaped = uri.GetComponents(UriComponents.AbsoluteUri, UriFormat.SafeUnescaped); 
                    if (unescaped.StartsWith(XmlConstants.DataWebRelatedNamespace, StringComparison.Ordinal))
                    { 
                        name = unescaped.Substring(XmlConstants.DataWebRelatedNamespace.Length);
                    }
                }
            } 

            return name; 
        } 

        /// is the serviceRoot the base of the request uri 
        /// baseUriWithSlash
        /// requestUri
        /// true if the serviceRoot is the base of the request uri
        internal static bool IsBaseOf(Uri baseUriWithSlash, Uri requestUri) 
        {
#if !ASTORIA_LIGHT   // Uri.IsBaseOf not available 
            return baseUriWithSlash.IsBaseOf(requestUri); 
#else
            return requestUri.OriginalString.StartsWith(baseUriWithSlash.OriginalString, StringComparison.Ordinal); 
#endif
        }

        ///  
        /// Determines whether the  Uri instance is a
        /// base of the specified Uri instance. 
        ///  
        /// Candidate base URI.
        /// The specified Uri instance to test. 
        /// true if the current Uri instance is a base of uri; otherwise, false.
        internal static bool UriInvariantInsensitiveIsBaseOf(Uri current, Uri uri)
        {
            Debug.Assert(current != null, "current != null"); 
            Debug.Assert(uri != null, "uri != null");
 
            Uri upperCurrent = CreateBaseComparableUri(current); 
            Uri upperUri = CreateBaseComparableUri(uri);
 
            return UriUtil.IsBaseOf(upperCurrent, upperUri);
        }
    }
 
    /// 
    /// static xml utility function 
    ///  
    internal static partial class XmlUtil
    { 
        /// 
        /// An initial nametable so that string comparisons during
        /// deserialization become reference comparisions
        ///  
        /// nametable with element names used in application/atom+xml payload
        private static NameTable CreateAtomNameTable() 
        { 
            NameTable table = new NameTable();
            table.Add(XmlConstants.AtomNamespace); 
            table.Add(XmlConstants.DataWebNamespace);
            table.Add(XmlConstants.DataWebMetadataNamespace);

            table.Add(XmlConstants.AtomContentElementName); 
#if ASTORIA_CLIENT
            table.Add(XmlConstants.AtomContentSrcAttributeName); 
#endif 
            table.Add(XmlConstants.AtomEntryElementName);
            table.Add(XmlConstants.AtomETagAttributeName); 
            table.Add(XmlConstants.AtomFeedElementName);
#if ASTORIA_CLIENT
            table.Add(XmlConstants.AtomIdElementName);
#endif 
            table.Add(XmlConstants.AtomInlineElementName);
#if ASTORIA_CLIENT 
            table.Add(XmlConstants.AtomLinkElementName); 
            table.Add(XmlConstants.AtomLinkRelationAttributeName);
#endif 
            table.Add(XmlConstants.AtomNullAttributeName);
            table.Add(XmlConstants.AtomPropertiesElementName);
            table.Add(XmlConstants.AtomTitleElementName);
            table.Add(XmlConstants.AtomTypeAttributeName); 

            table.Add(XmlConstants.XmlErrorCodeElementName); 
            table.Add(XmlConstants.XmlErrorElementName); 
            table.Add(XmlConstants.XmlErrorInnerElementName);
            table.Add(XmlConstants.XmlErrorMessageElementName); 
            table.Add(XmlConstants.XmlErrorTypeElementName);
            return table;
        }
 
        /// 
        /// Creates a new XmlReader instance using the specified stream reader 
        ///  
        /// The stream reader from which you want to read
        /// The encoding of the stream 
        /// XmlReader with the appropriate xml settings
        internal static XmlReader CreateXmlReader(Stream stream, Encoding encoding)
        {
            Debug.Assert(null != stream, "null stream"); 

            XmlReaderSettings settings = new XmlReaderSettings(); 
            settings.CheckCharacters = false; 
            settings.CloseInput = true;
            settings.IgnoreWhitespace = true; 
            settings.NameTable = XmlUtil.CreateAtomNameTable();

            if (null == encoding)
            {   // auto-detect the encoding 
                return XmlReader.Create(stream, settings);
            } 
 
            return XmlReader.Create(new StreamReader(stream, encoding), settings);
        } 

        /// 
        /// Creates a new XmlWriter instance using the specified stream and writers the processing instruction
        /// with the given encoding value 
        /// 
        ///  The stream to which you want to write 
        ///  Encoding that you want to specify in the reader settings as well as the processing instruction  
        /// mlWriter with the appropriate xml settings and processing instruction
        internal static XmlWriter CreateXmlWriterAndWriteProcessingInstruction(Stream stream, Encoding encoding) 
        {
            Debug.Assert(null != stream, "null stream");
            Debug.Assert(null != encoding, "null encoding");
 
            XmlWriterSettings settings = new XmlWriterSettings();
            settings.CheckCharacters = false; 
            settings.ConformanceLevel = ConformanceLevel.Fragment; 
            settings.Encoding = encoding;
            settings.Indent = true; 
            settings.NewLineHandling = NewLineHandling.Entitize;

            XmlWriter writer = XmlWriter.Create(stream, settings);
            writer.WriteProcessingInstruction("xml", "version=\"1.0\" encoding=\"" + encoding.WebName + "\" standalone=\"yes\""); 
            return writer;
        } 
 
#if ASTORIA_CLIENT
        ///  
        /// get attribute value from specified namespace or empty namespace
        /// 
        /// reader
        /// attributeName 
        /// namespaceUri
        /// attribute value 
        internal static string GetAttributeEx(this XmlReader reader, string attributeName, string namespaceUri) 
        {
            return reader.GetAttribute(attributeName, namespaceUri) ?? reader.GetAttribute(attributeName); 
        }
#endif
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
// static xml utility functions
//  
//--------------------------------------------------------------------- 

#if ASTORIA_CLIENT 
namespace System.Data.Services.Client
#else
namespace System.Data.Services
#endif 
{
    using System.Diagnostics; 
    using System.Globalization; 
    using System.IO;
    using System.Text; 
    using System.Xml;

    /// 
    /// static uri utility functions 
    /// 
    internal static partial class UriUtil 
    { 
        /// Creates a URI suitable for host-agnostic comparison purposes.
        /// URI to compare. 
        /// URI suitable for comparison.
        private static Uri CreateBaseComparableUri(Uri uri)
        {
            Debug.Assert(uri != null, "uri != null"); 

            uri = new Uri(uri.OriginalString.ToUpper(CultureInfo.InvariantCulture), UriKind.RelativeOrAbsolute); 
 
            UriBuilder builder = new UriBuilder(uri);
            builder.Host = "h"; 
            builder.Port = 80;
            builder.Scheme = "http";
            return builder.Uri;
        } 

        /// Parse the atom link relation attribute value 
        /// atom link relation attribute value 
        /// the assocation name or null
        internal static string GetNameFromAtomLinkRelationAttribute(string value) 
        {
            string name = null;
            if (!String.IsNullOrEmpty(value))
            { 
                Uri uri = null;
                try 
                { 
                    uri = new Uri(value, UriKind.RelativeOrAbsolute);
                } 
                catch (UriFormatException)
                {   // ignore the exception, obviously we don't have our expected relation value
                }
 
                if ((null != uri) && uri.IsAbsoluteUri)
                { 
                    string unescaped = uri.GetComponents(UriComponents.AbsoluteUri, UriFormat.SafeUnescaped); 
                    if (unescaped.StartsWith(XmlConstants.DataWebRelatedNamespace, StringComparison.Ordinal))
                    { 
                        name = unescaped.Substring(XmlConstants.DataWebRelatedNamespace.Length);
                    }
                }
            } 

            return name; 
        } 

        /// is the serviceRoot the base of the request uri 
        /// baseUriWithSlash
        /// requestUri
        /// true if the serviceRoot is the base of the request uri
        internal static bool IsBaseOf(Uri baseUriWithSlash, Uri requestUri) 
        {
#if !ASTORIA_LIGHT   // Uri.IsBaseOf not available 
            return baseUriWithSlash.IsBaseOf(requestUri); 
#else
            return requestUri.OriginalString.StartsWith(baseUriWithSlash.OriginalString, StringComparison.Ordinal); 
#endif
        }

        ///  
        /// Determines whether the  Uri instance is a
        /// base of the specified Uri instance. 
        ///  
        /// Candidate base URI.
        /// The specified Uri instance to test. 
        /// true if the current Uri instance is a base of uri; otherwise, false.
        internal static bool UriInvariantInsensitiveIsBaseOf(Uri current, Uri uri)
        {
            Debug.Assert(current != null, "current != null"); 
            Debug.Assert(uri != null, "uri != null");
 
            Uri upperCurrent = CreateBaseComparableUri(current); 
            Uri upperUri = CreateBaseComparableUri(uri);
 
            return UriUtil.IsBaseOf(upperCurrent, upperUri);
        }
    }
 
    /// 
    /// static xml utility function 
    ///  
    internal static partial class XmlUtil
    { 
        /// 
        /// An initial nametable so that string comparisons during
        /// deserialization become reference comparisions
        ///  
        /// nametable with element names used in application/atom+xml payload
        private static NameTable CreateAtomNameTable() 
        { 
            NameTable table = new NameTable();
            table.Add(XmlConstants.AtomNamespace); 
            table.Add(XmlConstants.DataWebNamespace);
            table.Add(XmlConstants.DataWebMetadataNamespace);

            table.Add(XmlConstants.AtomContentElementName); 
#if ASTORIA_CLIENT
            table.Add(XmlConstants.AtomContentSrcAttributeName); 
#endif 
            table.Add(XmlConstants.AtomEntryElementName);
            table.Add(XmlConstants.AtomETagAttributeName); 
            table.Add(XmlConstants.AtomFeedElementName);
#if ASTORIA_CLIENT
            table.Add(XmlConstants.AtomIdElementName);
#endif 
            table.Add(XmlConstants.AtomInlineElementName);
#if ASTORIA_CLIENT 
            table.Add(XmlConstants.AtomLinkElementName); 
            table.Add(XmlConstants.AtomLinkRelationAttributeName);
#endif 
            table.Add(XmlConstants.AtomNullAttributeName);
            table.Add(XmlConstants.AtomPropertiesElementName);
            table.Add(XmlConstants.AtomTitleElementName);
            table.Add(XmlConstants.AtomTypeAttributeName); 

            table.Add(XmlConstants.XmlErrorCodeElementName); 
            table.Add(XmlConstants.XmlErrorElementName); 
            table.Add(XmlConstants.XmlErrorInnerElementName);
            table.Add(XmlConstants.XmlErrorMessageElementName); 
            table.Add(XmlConstants.XmlErrorTypeElementName);
            return table;
        }
 
        /// 
        /// Creates a new XmlReader instance using the specified stream reader 
        ///  
        /// The stream reader from which you want to read
        /// The encoding of the stream 
        /// XmlReader with the appropriate xml settings
        internal static XmlReader CreateXmlReader(Stream stream, Encoding encoding)
        {
            Debug.Assert(null != stream, "null stream"); 

            XmlReaderSettings settings = new XmlReaderSettings(); 
            settings.CheckCharacters = false; 
            settings.CloseInput = true;
            settings.IgnoreWhitespace = true; 
            settings.NameTable = XmlUtil.CreateAtomNameTable();

            if (null == encoding)
            {   // auto-detect the encoding 
                return XmlReader.Create(stream, settings);
            } 
 
            return XmlReader.Create(new StreamReader(stream, encoding), settings);
        } 

        /// 
        /// Creates a new XmlWriter instance using the specified stream and writers the processing instruction
        /// with the given encoding value 
        /// 
        ///  The stream to which you want to write 
        ///  Encoding that you want to specify in the reader settings as well as the processing instruction  
        /// mlWriter with the appropriate xml settings and processing instruction
        internal static XmlWriter CreateXmlWriterAndWriteProcessingInstruction(Stream stream, Encoding encoding) 
        {
            Debug.Assert(null != stream, "null stream");
            Debug.Assert(null != encoding, "null encoding");
 
            XmlWriterSettings settings = new XmlWriterSettings();
            settings.CheckCharacters = false; 
            settings.ConformanceLevel = ConformanceLevel.Fragment; 
            settings.Encoding = encoding;
            settings.Indent = true; 
            settings.NewLineHandling = NewLineHandling.Entitize;

            XmlWriter writer = XmlWriter.Create(stream, settings);
            writer.WriteProcessingInstruction("xml", "version=\"1.0\" encoding=\"" + encoding.WebName + "\" standalone=\"yes\""); 
            return writer;
        } 
 
#if ASTORIA_CLIENT
        ///  
        /// get attribute value from specified namespace or empty namespace
        /// 
        /// reader
        /// attributeName 
        /// namespaceUri
        /// attribute value 
        internal static string GetAttributeEx(this XmlReader reader, string attributeName, string namespaceUri) 
        {
            return reader.GetAttribute(attributeName, namespaceUri) ?? reader.GetAttribute(attributeName); 
        }
#endif
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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