/// Author: Francis A. Shanahan
/// http://www.FrancisShanahan.com 
using System;
using System.Xml;
using System.Net;
using System.IO;
using System.Text;
using System.Configuration;
using System.Xml.Xsl;
using System.Collections.Specialized;

/// <summary>
/// Simply Helper class with many useful Mashup functions
/// </summary>
public static class webUtility
{
    static webUtility()
    {
    }

    /// <summary>
    /// Transforms an xml document using an XSL style sheet
    /// </summary>
    /// <param name="myDoc">the XML to tranform</param>
    /// <param name="strXsl">The filename of the XSL file to use</param>
    /// <returns>The transformed document as a string</returns>
    public static string DoXSLTransformation(XmlDocument myDoc, string strXsl)
    {
        return DoXSLTransformation(myDoc, strXsl, null);        
    }

     public static string DoXSLTransformation(XmlDocument myDoc, string strXsl, XsltArgumentList myArgs)
    {
        // Create an XSL transformation
        XslCompiledTransform myProcessor = new XslCompiledTransform();

        // Load the XSL document
        myProcessor.Load(System.Web.HttpContext.Current.Server.MapPath(strXsl));

        // Create a text writer for use in the transformation
        StringWriter myWriter = new StringWriter();

        // Transform the source XML document
        myProcessor.Transform(myDoc, myArgs, myWriter);

        // Return the result as a string
        return myWriter.ToString();
    }
    


    /// <summary>
    /// Retrieves a Uri using HTTP GET and returns the results as XML
    /// </summary>
    /// <param name="strURL">Uri to retrive</param>
    /// <returns>Xml document results</returns>
    public static XmlDocument GetUri(string strURI)
    {
        // Create a request object
        HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(strURI);

        // Obtain the response from the server
        HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
        Stream myResponseStream = myResponse.GetResponseStream();

        // Load the result into an XML document
        XmlDocument myDoc = new XmlDocument();
        myDoc.Load(myResponseStream);

        // return the XML document
        return myDoc;
    }

    // Retrieves a response from a WebRequest
    // that was made asynchronously
    public static XmlDocument GetUri(HttpWebRequest myRequest, IAsyncResult myResult)
    {
        XmlDocument myDoc;
        HttpWebResponse myResponse = (HttpWebResponse)myRequest.EndGetResponse(myResult);        
        StreamReader myReceiveStream = new StreamReader(myResponse.GetResponseStream());
            
        // Create the doc and load it
        myDoc = new XmlDocument();        
        myDoc.Load(myReceiveStream);

        // Return the doc
        if (myDoc != null) { 
            return myDoc;        
        } else {
            return null;
        }
    }
}