XPathQueryGenerator.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Serialization / System / Runtime / Serialization / XPathQueryGenerator.cs / 1305376 / XPathQueryGenerator.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Runtime.Serialization
{ 
    using System;
    using System.Text; 
    using System.Reflection; 
    using System.Globalization;
    using System.Collections.Generic; 
    using System.Xml;

    public static class XPathQueryGenerator
    { 
        const string XPathSeparator = "/";
        const string NsSeparator = ":"; 
 
        public static string CreateFromDataContractSerializer(Type type, MemberInfo[] pathToMember, out XmlNamespaceManager namespaces)
        { 
            return CreateFromDataContractSerializer(type, pathToMember, null, out namespaces);
        }

        // Here you can provide your own root element Xpath which will replace the Xpath of the top level element 
        public static string CreateFromDataContractSerializer(Type type, MemberInfo[] pathToMember, StringBuilder rootElementXpath, out XmlNamespaceManager namespaces)
        { 
            if (type == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("type")); 
            }
            if (pathToMember == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("pathToMember")); 
            }
 
            DataContract currentContract = DataContract.GetDataContract(type); 
            ExportContext context;
 
            if (rootElementXpath == null)
            {
                context = new ExportContext(currentContract);
            } 
            else
            { 
                // use the provided xpath for top level element 
                context = new ExportContext(rootElementXpath);
            } 

            for (int pathToMemberIndex = 0; pathToMemberIndex < pathToMember.Length; pathToMemberIndex++)
            {
                currentContract = ProcessDataContract(currentContract, context, pathToMember[pathToMemberIndex]); 
            }
 
            namespaces = context.Namespaces; 
            return context.XPath;
        } 

        static DataContract ProcessDataContract(DataContract contract, ExportContext context, MemberInfo memberNode)
        {
            if (contract is ClassDataContract) 
            {
                return ProcessClassDataContract((ClassDataContract)contract, context, memberNode); 
            } 
            throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(XmlObjectSerializer.CreateSerializationException(SR.GetString(SR.QueryGeneratorPathToMemberNotFound)));
        } 

        static DataContract ProcessClassDataContract(ClassDataContract contract, ExportContext context, MemberInfo memberNode)
        {
            string prefix = context.SetNamespace(contract.Namespace.Value); 
            if (contract.Members != null)
            { 
                foreach (DataMember member in contract.Members) 
                {
                    if (member.MemberInfo == memberNode) 
                    {
                        context.WriteChildToContext(member, prefix);
                        return member.MemberTypeContract;
                    } 
                }
            } 
            throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(XmlObjectSerializer.CreateSerializationException(SR.GetString(SR.QueryGeneratorPathToMemberNotFound))); 
        }
 
        class ExportContext
        {
            XmlNamespaceManager namespaces;
            int nextPrefix; 
            StringBuilder xPathBuilder;
 
            public ExportContext(DataContract rootContract) 
            {
                this.namespaces = new XmlNamespaceManager(new NameTable()); 
                string prefix = SetNamespace(rootContract.TopLevelElementNamespace.Value);
                this.xPathBuilder = new StringBuilder(XPathQueryGenerator.XPathSeparator + prefix + XPathQueryGenerator.NsSeparator + rootContract.TopLevelElementName.Value);
            }
 
            public ExportContext(StringBuilder rootContractXPath)
            { 
                this.namespaces = new XmlNamespaceManager(new NameTable()); 
                this.xPathBuilder = rootContractXPath;
            } 

            public void WriteChildToContext(DataMember contextMember, string prefix)
            {
                this.xPathBuilder.Append(XPathQueryGenerator.XPathSeparator + prefix + XPathQueryGenerator.NsSeparator + contextMember.Name); 
            }
 
            public XmlNamespaceManager Namespaces 
            {
                get 
                {
                    return this.namespaces;
                }
            } 

            public string XPath 
            { 
                get
                { 
                    return this.xPathBuilder.ToString();
                }
            }
 
            public string SetNamespace(string ns)
            { 
                string prefix = namespaces.LookupPrefix(ns); 
                if (prefix == null || prefix.Length == 0)
                { 
                    prefix = "xg" + (this.nextPrefix++).ToString(NumberFormatInfo.InvariantInfo);
                    Namespaces.AddNamespace(prefix, ns);
                }
                return prefix; 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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XPathQueryGenerator.cs source code in C# .NET

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