Added Classes for detecting Root Elements of Hamann-Collections

HaWeb/XMLParser/IXMLRoot.cs

@@ -0,0 +1,47 @@
+namespace HaWeb.XMLParser;
+using System.Xml.Linq;
+
+public interface IXMLRoot {
+    // Name of the IXMLRoot
+    public abstract string Type { get; }
+
+    // Tag Name of the Container
+    public abstract string Container { get; }
+
+    // Tag Name of child objects to be collected 
+    public abstract Predicate<XElement> IsCollectedObject { get; }
+
+    // Gets the Key of a collected object
+    public abstract Func<XElement, string?> GetKey { get; }
+
+    // Is the pesented XElement such a root? 
+    public bool IsTypeOf(XElement xelement) {
+        if (xelement.Name == this.Container) return true;
+        return false;
+    }
+
+    // Generate certain metadat fields to display about this root
+    public abstract List<(string, string)>? GenerateFields(XMLRootDocument document);
+
+    // Generate an identification string of which the hash will be the filename. 
+    // The second string will be appended literally for convenience.
+    // If the queries of two document are equal they replace each other
+    // If the queries and the date of two documents are equal the later one gets deleted
+    public abstract (string?, string) GenerateIdentificationString(XElement element);
+
+    // Further deciding which of two documents replaces which
+    public abstract bool Replaces(XMLRootDocument doc1, XMLRootDocument doc2);
+
+    public Dictionary<string, XElement>? GetCollectedObjects(XMLRootDocument document) {
+        Dictionary<string, XElement>? ret = null;
+        var root = document.Root;
+        root.Elements().Where(x => this.IsCollectedObject(x)).ToList().ForEach(x => {
+            var id = this.GetKey(x);
+            if (id != null) {
+                if (ret == null) ret = new Dictionary<string, XElement>();
+                ret.Add(id, x);
+            }
+        });
+        return ret;
+    }
+}