RssImage.cs

using System;
using System.Xml;
using Waher.Runtime.Collections;
 
namespace Waher.Content.Rss
{
    public class RssImage
    {
        public RssImage(XmlElement Xml, Uri BaseUri)
        {
            if (Xml is null)
                throw new ArgumentNullException(nameof(Xml));
 
            ChunkedList<RssWarning> Warnings = new ChunkedList<RssWarning>();
 
            foreach (XmlNode N in Xml.ChildNodes)
            {
                if (!(N is XmlElement E))
                    continue;
 
                if (E.NamespaceURI == Xml.NamespaceURI)
                {
                    switch (E.LocalName)
                    {
                        case "url":
                            if (Uri.TryCreate(BaseUri, E.InnerText, out Uri Url))
                                this.Url = Url;
                            else
                                Warnings.Add(new RssWarning(E, "Invalid URI: " + E.InnerText));
                            break;
 
                        case "title":
                            this.Title = E.InnerText;
                            break;
 
                        case "link":
                            if (Uri.TryCreate(BaseUri, E.InnerText, out Uri Link))
                                this.Link = Link;
                            else
                                Warnings.Add(new RssWarning(E, "Invalid URI: " + E.InnerText));
                            break;
 
                        case "width":
                            if (int.TryParse(E.InnerText, out int Width) && Width > 0 && Width <= 144)
                                this.Width = Width;
                            else
                                Warnings.Add(new RssWarning(E, "Invalid Width: " + E.InnerText));
                            break;
 
                        case "height":
                            if (int.TryParse(E.InnerText, out int Height) && Height > 0 && Height <= 400)
                                this.Height = Height;
                            else
                                Warnings.Add(new RssWarning(E, "Invalid Height: " + E.InnerText));
                            break;
 
                        case "description":
                            this.Description = E.InnerText;
                            break;
 
                        default:
                            Warnings.Add(new RssWarning(E));
                            break;
                    }
                }
                else
                    Warnings.Add(new RssWarning(E));
            }
 
            this.Warnings = Warnings.ToArray();
        }
 
        public RssWarning[] Warnings { get; }
 
        public Uri Url { get; } = null;
 
        public string Title { get; }
 
        public Uri Link { get; } = null;
 
        public int Width { get; } = 88;
 
        public int Height { get; } = 31;
 
        public string Description { get; }
    }
}