XsltDecoder.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Xsl;
using Waher.Runtime.Inventory;
 
namespace Waher.Content.Xml.Text
{
    public class XsltDecoder : IContentDecoder
    {
        public XsltDecoder()
        {
        }
 
        public static readonly string[] XmlContentTypes = new string[]
        {
            "text/xsl",
            "application/xslt+xml"
        };
 
        public static readonly string[] XmlFileExtensions = new string[]
        {
            "xsl",
            "xslt"
        };
 
        public string[] ContentTypes => XmlContentTypes;
 
        public string[] FileExtensions => XmlFileExtensions;
 
        public bool Decodes(string ContentType, out Grade Grade)
        {
            if (Array.IndexOf(XmlContentTypes, ContentType) >= 0)
            {
                Grade = Grade.Excellent;
                return true;
            }
            else
            {
                Grade = Grade.NotAtAll;
                return false;
            }
        }
 
        public Task<object> DecodeAsync(string ContentType, byte[] Data, Encoding Encoding, KeyValuePair<string, string>[] Fields, Uri BaseUri)
        {
            using (Stream f = new MemoryStream(Data))
            {
                using (XmlReader r = XmlReader.Create(f))
                {
                    XslCompiledTransform Xslt = new XslCompiledTransform();
                    Xslt.Load(r);
 
                    return Task.FromResult<object>(Xslt);
                }
            }
        }
 
        public bool TryGetContentType(string FileExtension, out string ContentType)
        {
            switch (FileExtension.ToLower())
            {
                case "xsl":
                case "xslt":
                    ContentType = "application/xslt+xml";
                    return true;
 
                default:
                    ContentType = string.Empty;
                    return false;
            }
        }
 
        public bool TryGetFileExtension(string ContentType, out string FileExtension)
        {
            switch (ContentType.ToLower())
            {
                case "application/xslt+xml":
                    FileExtension = "xslt";
                    return true;
 
                default:
                    FileExtension = string.Empty;
                    return false;
            }
        }
 
    }
}