First Commit (Fobi)

control/MyClassLoader.java

@@ -0,0 +1,53 @@
+package control;
+
+import java.io.*;
+import java.net.*;
+import java.util.regex.Pattern;
+
+/**
+ * Hilfsklasse, um Algorithmen-Classen dynamisch nachladen zu können und 
+ * aktualisierte Class-Dateien während der Laufzeit erneut laden zu können.
+ * 
+ * @author Schaller (nach http://tutorials.jenkov.com/java-reflection/dynamic-class-loading-reloading.html)
+ * @version 16.02.2021
+ */
+public class MyClassLoader extends ClassLoader{
+
+    public MyClassLoader(ClassLoader parent) {
+        super(parent);
+    }
+
+    public Class loadClass(String name) throws ClassNotFoundException {
+        if(!name.contains("GraphAlgo_"))
+                return super.loadClass(name);
+
+        try {
+      
+                
+            URL myUrl = new URL("file:"+name.split(Pattern.quote("."))[0]+"/"+name.split(Pattern.quote("."))[1]+".class");
+            URLConnection connection = myUrl.openConnection();
+            InputStream input = connection.getInputStream();
+            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
+            int data = input.read();
+
+            while(data != -1){
+                buffer.write(data);
+                data = input.read();
+            }
+
+            input.close();
+
+            byte[] classData = buffer.toByteArray();
+
+            return defineClass(name, classData, 0, classData.length);
+
+        } catch (MalformedURLException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+}