Пример #1
0
 /// <summary>Closes connection to file.</summary>
 /// <remarks>This method also releases any resources held while reading.</remarks>
 public void Close()
 {
     textInput = null;
     image     = null;
     cloud     = null;
     channel   = null;
     source    = null;
     enclosure = null;
     category  = null;
     item      = null;
     if (reader != null)
     {
         reader.Close();
         reader = null;
     }
     elementText  = null;
     xmlNodeStack = null;
 }
Пример #2
0
        /// <summary>Reads the next RssElement from the stream.</summary>
        /// <returns>An RSS Element</returns>
        /// <exception cref="InvalidOperationException">RssReader has been closed, and can not be read.</exception>
        /// <exception cref="System.IO.FileNotFoundException">RSS file not found.</exception>
        /// <exception cref="System.Xml.XmlException">Invalid XML syntax in RSS file.</exception>
        /// <exception cref="System.IO.EndOfStreamException">Unable to read an RssElement. Reached the end of the stream.</exception>
        public RssElement Read()
        {
            var        readData     = false;
            var        pushElement  = true;
            RssElement rssElement   = null;
            var        lineNumber   = -1;
            var        linePosition = -1;

            if (reader == null)
            {
                throw new InvalidOperationException("RssReader has been closed, and can not be read.");
            }

            do
            {
                pushElement = true;
                try
                {
                    readData = reader.Read();
                }
                catch (EndOfStreamException e)
                {
                    throw new EndOfStreamException("Unable to read an RssElement. Reached the end of the stream.", e);
                }
                catch (XmlException e)
                {
                    if (lineNumber != -1 || linePosition != -1)
                    {
                        if (reader.LineNumber == lineNumber && reader.LinePosition == linePosition)
                        {
                            throw exceptions.LastException;
                        }
                    }

                    lineNumber   = reader.LineNumber;
                    linePosition = reader.LinePosition;

                    exceptions.Add(e);                     // just add to list of exceptions and continue :)
                }
                if (readData)
                {
                    var readerName = reader.Name.ToLower();
                    switch (reader.NodeType)
                    {
                    case XmlNodeType.Element:
                    {
                        if (reader.IsEmptyElement)
                        {
                            break;
                        }
                        elementText = new StringBuilder();

                        switch (readerName)
                        {
                        case "item":
                            // is this the end of the channel element? (absence of </channel> before <item>)
                            if (!wroteChannel)
                            {
                                wroteChannel = true;
                                rssElement   = channel;                                               // return RssChannel
                                readData     = false;
                            }
                            item = new RssItem();                                             // create new RssItem
                            channel.Items.Add(item);
                            break;

                        case "source":
                            source      = new RssSource();
                            item.Source = source;
                            for (var i = 0; i < reader.AttributeCount; i++)
                            {
                                reader.MoveToAttribute(i);
                                switch (reader.Name.ToLower())
                                {
                                case "url":
                                    try
                                    {
                                        source.Url = new Uri(reader.Value);
                                    }
                                    catch (Exception e)
                                    {
                                        exceptions.Add(e);
                                    }
                                    break;
                                }
                            }
                            break;

                        case "enclosure":
                            enclosure      = new RssEnclosure();
                            item.Enclosure = enclosure;
                            for (var i = 0; i < reader.AttributeCount; i++)
                            {
                                reader.MoveToAttribute(i);
                                switch (reader.Name.ToLower())
                                {
                                case "url":
                                    try
                                    {
                                        enclosure.Url = new Uri(reader.Value);
                                    }
                                    catch (Exception e)
                                    {
                                        exceptions.Add(e);
                                    }
                                    break;

                                case "length":
                                    try
                                    {
                                        enclosure.Length = int.Parse(reader.Value);
                                    }
                                    catch (Exception e)
                                    {
                                        exceptions.Add(e);
                                    }
                                    break;

                                case "type":
                                    enclosure.Type = reader.Value;
                                    break;
                                }
                            }
                            break;

                        case "guid":
                            guid      = new RssGuid();
                            item.Guid = guid;
                            for (var i = 0; i < reader.AttributeCount; i++)
                            {
                                reader.MoveToAttribute(i);
                                switch (reader.Name.ToLower())
                                {
                                case "ispermalink":
                                    try
                                    {
                                        guid.PermaLink = bool.Parse(reader.Value);
                                    }
                                    catch (Exception e)
                                    {
                                        exceptions.Add(e);
                                    }
                                    break;
                                }
                            }
                            break;

                        case "category":
                            category = new RssCategory();
                            if ((string)xmlNodeStack.Peek() == "channel")
                            {
                                channel.Categories.Add(category);
                            }
                            else
                            {
                                item.Categories.Add(category);
                            }
                            for (var i = 0; i < reader.AttributeCount; i++)
                            {
                                reader.MoveToAttribute(i);
                                switch (reader.Name.ToLower())
                                {
                                case "url":
                                    goto case "domain";

                                case "domain":
                                    category.Domain = reader.Value;
                                    break;
                                }
                            }
                            break;

                        case "channel":
                            channel   = new RssChannel();
                            textInput = null;
                            image     = null;
                            cloud     = null;
                            source    = null;
                            enclosure = null;
                            category  = null;
                            item      = null;
                            break;

                        case "image":
                            image         = new RssImage();
                            channel.Image = image;
                            break;

                        case "textinput":
                            textInput         = new RssTextInput();
                            channel.TextInput = textInput;
                            break;

                        case "cloud":
                            pushElement   = false;
                            cloud         = new RssCloud();
                            channel.Cloud = cloud;
                            for (var i = 0; i < reader.AttributeCount; i++)
                            {
                                reader.MoveToAttribute(i);
                                switch (reader.Name.ToLower())
                                {
                                case "domain":
                                    cloud.Domain = reader.Value;
                                    break;

                                case "port":
                                    try
                                    {
                                        cloud.Port = ushort.Parse(reader.Value);
                                    }
                                    catch (Exception e)
                                    {
                                        exceptions.Add(e);
                                    }
                                    break;

                                case "path":
                                    cloud.Path = reader.Value;
                                    break;

                                case "registerprocedure":
                                    cloud.RegisterProcedure = reader.Value;
                                    break;

                                case "protocol":
                                    switch (reader.Value.ToLower())
                                    {
                                    case "xml-rpc":
                                        cloud.Protocol = RssCloudProtocol.XmlRpc;
                                        break;

                                    case "soap":
                                        cloud.Protocol = RssCloudProtocol.Soap;
                                        break;

                                    case "http-post":
                                        cloud.Protocol = RssCloudProtocol.HttpPost;
                                        break;

                                    default:
                                        cloud.Protocol = RssCloudProtocol.Empty;
                                        break;
                                    }
                                    break;
                                }
                            }
                            break;

                        case "rss":
                            for (var i = 0; i < reader.AttributeCount; i++)
                            {
                                reader.MoveToAttribute(i);
                                if (reader.Name.ToLower() == "version")
                                {
                                    switch (reader.Value)
                                    {
                                    case "0.91":
                                        rssVersion = RssVersion.RSS091;
                                        break;

                                    case "0.92":
                                        rssVersion = RssVersion.RSS092;
                                        break;

                                    case "2.0":
                                        rssVersion = RssVersion.RSS20;
                                        break;

                                    default:
                                        rssVersion = RssVersion.NotSupported;
                                        break;
                                    }
                                }
                            }
                            break;

                        case "rdf":
                            for (var i = 0; i < reader.AttributeCount; i++)
                            {
                                reader.MoveToAttribute(i);
                                if (reader.Name.ToLower() == "version")
                                {
                                    switch (reader.Value)
                                    {
                                    case "0.90":
                                        rssVersion = RssVersion.RSS090;
                                        break;

                                    case "1.0":
                                        rssVersion = RssVersion.RSS10;
                                        break;

                                    default:
                                        rssVersion = RssVersion.NotSupported;
                                        break;
                                    }
                                }
                            }
                            break;
                        }
                        if (pushElement)
                        {
                            xmlNodeStack.Push(readerName);
                        }
                        break;
                    }

                    case XmlNodeType.EndElement:
                    {
                        if (xmlNodeStack.Count == 1)
                        {
                            break;
                        }
                        var childElementName  = (string)xmlNodeStack.Pop();
                        var parentElementName = (string)xmlNodeStack.Peek();
                        switch (childElementName)                                 // current element
                        {
                        // item classes
                        case "item":
                            rssElement = item;
                            readData   = false;
                            break;

                        case "source":
                            source.Name = elementText.ToString();
                            rssElement  = source;
                            readData    = false;
                            break;

                        case "enclosure":
                            rssElement = enclosure;
                            readData   = false;
                            break;

                        case "guid":
                            guid.Name  = elementText.ToString();
                            rssElement = guid;
                            readData   = false;
                            break;

                        case "category":                                         // parent is either item or channel
                            category.Name = elementText.ToString();
                            rssElement    = category;
                            readData      = false;
                            break;

                        // channel classes
                        case "channel":
                            if (wroteChannel)
                            {
                                wroteChannel = false;
                            }
                            else
                            {
                                wroteChannel = true;
                                rssElement   = channel;
                                readData     = false;
                            }
                            break;

                        case "textinput":
                            rssElement = textInput;
                            readData   = false;
                            break;

                        case "image":
                            rssElement = image;
                            readData   = false;
                            break;

                        case "cloud":
                            rssElement = cloud;
                            readData   = false;
                            break;
                        }
                        switch (parentElementName)                                 // parent element
                        {
                        case "item":
                            switch (childElementName)
                            {
                            case "title":
                                item.Title = elementText.ToString();
                                break;

                            case "link":
                                item.Link = new Uri(elementText.ToString());
                                break;

                            case "description":
                                item.Description = elementText.ToString();
                                break;

                            case "author":
                                item.Author = elementText.ToString();
                                break;

                            case "comments":
                                item.Comments = elementText.ToString();
                                break;

                            case "pubdate":
                                try
                                {
                                    item.PubDate = DateTime.Parse(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    try {
                                        var tmp = elementText.ToString();
                                        tmp          = tmp.Substring(0, tmp.Length - 5);
                                        tmp         += "GMT";
                                        item.PubDate = DateTime.Parse(tmp);
                                    }
                                    catch
                                    {
                                        exceptions.Add(e);
                                    }
                                }
                                break;
                            }
                            break;

                        case "channel":
                            switch (childElementName)
                            {
                            case "title":
                                channel.Title = elementText.ToString();
                                break;

                            case "link":
                                try
                                {
                                    channel.Link = new Uri(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;

                            case "description":
                                channel.Description = elementText.ToString();
                                break;

                            case "language":
                                channel.Language = elementText.ToString();
                                break;

                            case "copyright":
                                channel.Copyright = elementText.ToString();
                                break;

                            case "managingeditor":
                                channel.ManagingEditor = elementText.ToString();
                                break;

                            case "webmaster":
                                channel.WebMaster = elementText.ToString();
                                break;

                            case "rating":
                                channel.Rating = elementText.ToString();
                                break;

                            case "pubdate":
                                try
                                {
                                    channel.PubDate = DateTime.Parse(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;

                            case "lastbuilddate":
                                try
                                {
                                    channel.LastBuildDate = DateTime.Parse(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;

                            case "generator":
                                channel.Generator = elementText.ToString();
                                break;

                            case "docs":
                                channel.Docs = elementText.ToString();
                                break;

                            case "ttl":
                                try
                                {
                                    channel.TimeToLive = int.Parse(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;
                            }
                            break;

                        case "image":
                            switch (childElementName)
                            {
                            case "url":
                                try
                                {
                                    image.Url = new Uri(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;

                            case "title":
                                image.Title = elementText.ToString();
                                break;

                            case "link":
                                try
                                {
                                    image.Link = new Uri(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;

                            case "description":
                                image.Description = elementText.ToString();
                                break;

                            case "width":
                                try
                                {
                                    image.Width = Byte.Parse(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;

                            case "height":
                                try
                                {
                                    image.Height = Byte.Parse(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;
                            }
                            break;

                        case "textinput":
                            switch (childElementName)
                            {
                            case "title":
                                textInput.Title = elementText.ToString();
                                break;

                            case "description":
                                textInput.Description = elementText.ToString();
                                break;

                            case "name":
                                textInput.Name = elementText.ToString();
                                break;

                            case "link":
                                try
                                {
                                    textInput.Link = new Uri(elementText.ToString());
                                }
                                catch (Exception e)
                                {
                                    exceptions.Add(e);
                                }
                                break;
                            }
                            break;

                        case "skipdays":
                            if (childElementName == "day")
                            {
                                switch (elementText.ToString().ToLower())
                                {
                                case "monday":
                                    channel.SkipDays[0] = true;
                                    break;

                                case "tuesday":
                                    channel.SkipDays[1] = true;
                                    break;

                                case "wednesday":
                                    channel.SkipDays[2] = true;
                                    break;

                                case "thursday":
                                    channel.SkipDays[3] = true;
                                    break;

                                case "friday":
                                    channel.SkipDays[4] = true;
                                    break;

                                case "saturday":
                                    channel.SkipDays[5] = true;
                                    break;

                                case "sunday":
                                    channel.SkipDays[6] = true;
                                    break;
                                }
                            }
                            break;

                        case "skiphours":
                            if (childElementName == "hour")
                            {
                                channel.SkipHours[Byte.Parse(elementText.ToString().ToLower())] = true;
                            }
                            break;
                        }
                        break;
                    }

                    case XmlNodeType.Text:
                        elementText.Append(reader.Value);
                        break;

                    case XmlNodeType.CDATA:
                        elementText.Append(reader.Value);
                        break;
                    }
                }
            }while (readData);
            return(rssElement);
        }