From 216629800e8af7fe2582ea53cf59de82026184bb Mon Sep 17 00:00:00 2001
From: Aryadev Chavali <aryadevchavali1@gmail.com>
Date: Mon, 4 Feb 2019 00:24:32 +0000
Subject: Changed class name

---
 Aggregator/Parser/ParserService.cs | 50 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Aggregator/Parser/ParserService.cs

(limited to 'Aggregator/Parser/ParserService.cs')

diff --git a/Aggregator/Parser/ParserService.cs b/Aggregator/Parser/ParserService.cs
new file mode 100644
index 0000000..7d490cb
--- /dev/null
+++ b/Aggregator/Parser/ParserService.cs
@@ -0,0 +1,50 @@
+using System;
+using System.Linq;
+using System.Xml.Linq;
+using System.Collections.Generic;
+using Aggregator.Classes;
+
+namespace Aggregator.Parser {
+    /// <summary>
+    /// Class to provide Parsing services
+    /// </summary>
+    public static class Parser {
+
+        /// <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
+            }
+        }
+    }
+}
\ No newline at end of file
-- 
cgit v1.2.3-13-gbd6f