From 16df5c0fdf14276575396813dae493e4c3442133 Mon Sep 17 00:00:00 2001
From: Johannes Theiner <j.theiner@live.de>
Date: Mon, 23 Apr 2018 10:15:14 +0200
Subject: [PATCH] Praktikum 3: multiple titles jetzt richtig

---
 .../praktikum3/Vorlesungsverzeichnis.java     | 20 +++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/main/java/de/joethei/hs/java2/praktikum/praktikum3/Vorlesungsverzeichnis.java b/src/main/java/de/joethei/hs/java2/praktikum/praktikum3/Vorlesungsverzeichnis.java
index f530ab0..9ee5f75 100644
--- a/src/main/java/de/joethei/hs/java2/praktikum/praktikum3/Vorlesungsverzeichnis.java
+++ b/src/main/java/de/joethei/hs/java2/praktikum/praktikum3/Vorlesungsverzeichnis.java
@@ -7,17 +7,16 @@ import java.util.*;
 import java.util.stream.Collectors;
 
 public class Vorlesungsverzeichnis implements Comparator<Vorlesung>{
+
     private Set<Vorlesung> vorlesungen = new HashSet<>();
 
     public Vorlesungsverzeichnis(String filename) throws IOException {
+        List<List<String>> datenbasis = load(filename);
+        for (List<String> entry : datenbasis) {
+            if (entry.size() != 4) throw new TextFileFormatException("unexpected number of Strings in line");
+            for (String s : entry) if (s.isEmpty()) throw new TextFileFormatException("empty attribute");
 
-        List<List<String>> datenbasis;
-        datenbasis = load(filename);
-        for (List<String> a : datenbasis) {
-            if (a.size() != 4) throw new TextFileFormatException("unexpected number of Strings in line");
-            for (String s : a) if (s.isEmpty()) throw new TextFileFormatException("empty attribute");
-
-            vorlesungen.add(new Vorlesung(a));
+            vorlesungen.add(new Vorlesung(entry));
         }
     }
 
@@ -120,8 +119,13 @@ public class Vorlesungsverzeichnis implements Comparator<Vorlesung>{
         return map;
         */
         Map<String, List<String>> map = vorlesungen.stream().collect(Collectors.groupingBy(Vorlesung::getTitle, Collectors.mapping(Vorlesung::getDozent, Collectors.toList())));
-        map.forEach((s, strings) -> Collections.sort(strings));
 
+        Iterator<Map.Entry<String, List<String>>> iterator = map.entrySet().iterator();
+        while (iterator.hasNext()) {
+            Map.Entry<String, List<String>> entry = iterator.next();
+            if(entry.getValue().size() < 2) iterator.remove();
+            Collections.sort(entry.getValue());
+        }
 
         return map;