major refactoring

* monitor classes can call callback functions
* cleanup
* class hierarchy is cleaner (state, progress, monitor)

Author: Burak Akguel

src/main/java/de/hhu/bsinfo/dxmonitor/error/CantReadFileException.java renamed to src/main/java/de/hhu/bsinfo/dxmonitor/CSVPrinter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018 Heinrich-Heine-Universitaet Duesseldorf, Institute of Computer Science, Department Operating Systems
+ * Copyright (C) 2017 Heinrich-Heine-Universitaet Duesseldorf, Institute of Computer Science, Department Operating Systems
  *
  * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
@@ -11,19 +11,27 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  */
 
-package de.hhu.bsinfo.dxmonitor.error;
+package de.hhu.bsinfo.dxmonitor;
 
 /**
- * @author Burak Akguel, [email protected], 23.11.17
+ * Interface for generating CSV data strings from objects
+ *
+ * @author Stefan Nothaas, [email protected], 20.02.2018
  */
-public class CantReadFileException extends Exception {
+public interface CSVPrinter {
+    /**
+     * Create the header which describes the data
+     *
+     * @param p_delim The delimiter to use to separate values
+     * @return CSV header line which describes the data
+     */
+    String generateCSVHeader(final char p_delim);
+
     /**
-     * Throws an Exception because the given path is invalid.
+     * Print the object/data as a single CSV line
      *
-     * @param p_file
-     *     Path of the file
+     * @param p_delim The delimiter to use to separate values
+     * @return CSV line which contains the data of the object
      */
-    public CantReadFileException(final String p_file) {
-        super("Error: Couldn't read from file " + p_file + '!');
-    }
+    String toCSV(final char p_delim);
 }