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Linq-To-XML Style of Node Creation for C++

, 7 Jun 2012
Linq-To-XML Node Creation for Native C++
elmax-84498.zip
BuildProcessTemplates
ElmaxNet
Properties
Elmax
Elmax.vcxproj.user
StringUtils
TestNativeElmax
app.ico
TestNativeElmax.vcxproj.user
TestNetElmax
Properties
TestNetElmax.csproj.user
TryoutNet
Properties
Settings.settings
Tryout
res
Tryout.ico
Tryout.vcxproj.user
elmax-ver083.zip
Elmax.vcxproj.user
app.ico
TestNativeElmax.vcxproj.user
TestNetElmax.csproj.user
Settings.settings
Tryout.ico
Tryout.vcxproj.user
elmax-ver084.zip
Elmax.vcxproj.user
app.ico
TestNativeElmax.vcxproj.user
TestNetElmax.csproj.user
Settings.settings
Tryout.ico
Tryout.vcxproj.user
elmax-ver085.zip
Elmax.vcxproj.user
app.ico
TestNativeElmax.vcxproj.user
TestNetElmax.csproj.user
Settings.settings
Tryout.ico
Tryout.vcxproj.user
elmax-ver086.zip
Elmax.vcxproj.user
app.ico
TestNativeElmax.vcxproj.user
TestNetElmax.csproj.user
Settings.settings
Tryout.ico
Tryout.vcxproj.user
elmax-ver087.zip
Elmax.vcxproj.user
app.ico
TestNativeElmax.vcxproj.user
TestNetElmax.csproj.user
Settings.settings
Tryout.ico
Tryout.vcxproj.user
Elmax-ver089.zip
Elmax-ver089
Elmax.vsmdi
Elmax
Elmax.vcxproj.user
StringUtils
ElmaxNet
Properties
Local.testsettings
TestNativeElmax
app.ico
TestNativeElmax.vcxproj.user
TestNetElmax
Properties
TestNetElmax.csproj.user
TraceAndTestImpact.testsettings
Tryout
res
Tryout.ico
Tryout.vcxproj.user
TryoutNet
Properties
Settings.settings
ElmaxSrcVer082.zip
Elmax.vcxproj.user
app.ico
TestNativeElmax.vcxproj.user
TestNetElmax.csproj.user
Settings.settings
Tryout.ico
Tryout.vcxproj.user
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;

namespace Elmax
{
    /// <summary>
    /// Helper class to use the .NET XmlDocument's XPath methods
    /// </summary>
    public class Document
    {
        /// <summary>
        /// Non-default constructor
        /// </summary>
        /// <param name="doc"></param>
        public Document(XmlDocument doc) 
        {
            _Doc = doc;
        }
        /// <summary>
        /// Get elements by tag name
        /// </summary>
        /// <param name="tagName">Is Tag name</param>
        /// <returns>List of elements that have the same tag name</returns>
	    public List<Elmax.Element> GetElementsByTagName(string tagName)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");

            List<Elmax.Element> list = new List<Elmax.Element>();

            XmlNodeList nodeList = _Doc.GetElementsByTagName(tagName);

            ConvNodeListToList(nodeList, ref list);

            return list;
        }
        /// <summary>
        /// Get elements by tag name within certain namespace URI
        /// </summary>
        /// <param name="tagName">Is Tag name</param>
        /// <param name="namespaceURI"></param>
        /// <returns>List of elements that have the same tag name</returns>
        public List<Elmax.Element> GetElementsByTagName(string tagName, string namespaceURI)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");

            List<Elmax.Element> list = new List<Elmax.Element>();

            XmlNodeList nodeList = _Doc.GetElementsByTagName(tagName, namespaceURI);

            ConvNodeListToList(nodeList, ref list);

            return list;
        }
        /// <summary>
        /// Get element by Id
        /// </summary>
        /// <param name="id">is Id</param>
        /// <returns>Element</returns>
        public Elmax.Element GetElementById(string id)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");

            XmlNode node = _Doc.GetElementById(id);

            if(node!=null)
                return new Element(_Doc, node, "", node.Name, true, false);

            return new Element();
        }
        /// <summary>
        /// Select the elements using XPath expression
        /// </summary>
        /// <param name="xpath">XPath expression</param>
        /// <returns>List of elements which satisfy the XPath expression</returns>
	    public List<Elmax.Element> SelectNodes(string xpath)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");
            
            List<Elmax.Element> list = new List<Elmax.Element>();

	        XmlNodeList nodeList = _Doc.SelectNodes(xpath);

	        ConvNodeListToList(nodeList, ref list);

	        return list;
        }
        /// <summary>
        /// Select the element using XPath expression
        /// </summary>
        /// <param name="xpath">XPath expression</param>
        /// <returns>Element which satisfies the XPath expression</returns>
	    public Elmax.Element SelectSingleNode(string xpath)
        {
            if (_Doc == null)
                throw new System.InvalidOperationException("Invalid document");

	        XmlNode node = _Doc.SelectSingleNode(xpath);

            if (node != null)
            {
                return new Element(_Doc, node, "", node.Name, true, false);
            }

            return new Element();
        }
        /// <summary>
        /// Convert a list of nodes to a list of Elmax elements
        /// </summary>
        /// <param name="pList"></param>
        /// <param name="list"></param>
        private void ConvNodeListToList(XmlNodeList pList, ref List<Elmax.Element> list)
        {
	        if(pList==null)
		        return;

	        for(int i=0; i<pList.Count; ++i)
	        {
		        Element ele = new Element(_Doc, pList[i], "", pList[i].Name, true, false );
		        list.Add(ele);
	        }
        }

        /// <summary>
        /// Save with the indentation and newlines
        /// </summary>
        /// <param name="file">file path</param>
        /// <returns>true if successful</returns>
        public bool PrettySave(string file)
        {
            if (_Doc == null)
                return false;

            XmlWriter writer = null;
            try
            {
                XmlWriterSettings settings = new XmlWriterSettings();
                settings.Indent = true;
                settings.IndentChars = "  ";
                settings.NewLineChars = "\r\n";
                settings.NewLineHandling = NewLineHandling.Replace;
                settings.OmitXmlDeclaration = false;
                writer = XmlWriter.Create(file, settings);
                _Doc.Save(writer);
            }
            catch (System.Exception)
            {
                return false;            	
            }
            finally
            {
                if (writer != null)
                {
                    writer.Close();
                    writer = null;
                }
            }
            return true;
        }

        /// <summary>
        /// Internal XML document object
        /// </summary>
        private XmlDocument _Doc;
    }
}

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License

This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)

About the Author

Wong Shao Voon
Software Developer
Singapore Singapore

Currently into areas like 3D graphics and application security. Hoping to revisit the cryptography and design pattern topics if time permits.


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