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using System;
using System.Linq;
using System.Xml.Linq;
using System.Collections.Generic;
using Classes;
namespace Aggregator.Parser {
/// <summary>
/// Class to provide Parsing services
/// </summary>
public static class ParserService {
/// <summary>
/// Parse a single xml code, given a config, to Articles
/// </summary>
/// <param name="xml">XML code from an RSS feed</param>
/// <param name="config">Config that tells parser where to get relevant information</param>
/// <returns>Parsed articles from XML code</returns>
public static IEnumerable<Article> Parse(string xml, Config config) {
return XDocument.Parse(xml).Descendants("item") //make an XDocument out of the xml
.Select(articles => articles.Descendants().ToArray()) //turn each 'item' into it's respective descendants
.Select(article => new Article() //make a new article from each 'item' article, using config for pointers
{
Source = config.Source,
Title = article[config.Title].Value,
Description = article[config.Description].Value,
ArticleLink = article[config.ArticleLink].Value,
ImageLink = article[config.ImageLink].Attribute("url").Value,
PublishDate = DateTime.Parse(article[config.PublishDate].Value)
}).Distinct(); //remove any duplicates
}
/// <summary>
/// Parse multiple xml sets, given a similar set of configs, to Articles
/// </summary>
/// <param name="xmls">Array of XML sets to parse for Articles</param>
/// <param name="configs">List of configs to parse for corresponding xml sets</param>
/// <returns>Parsed articles from every XML set</returns>
public static IEnumerable<Article> ParseMultiple(string[] xmls, List<Config> configs) {
if (configs.Count == 0 || xmls.Length == 0 || (xmls.Length != configs.Count)) {
return null; //for bad cases
}
else {
return xmls.Select((xml, index) => Parse(xml, configs[index])) //Parse each item
.SelectMany(i => i); //remove distinctions between each set of articles
}
}
}
}
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