public boolean containsKey(Bauernhof b) {
BauernhofIterator it = new BauernhofIterator(this.keys);
Bauernhof elem = null;
while (it.hasNext()) {
elem = it.getNext();
if (elem.getName().equals(b.getName())) return true;
}
return false;
// returns whether specific key is in map or not
}
public String toString() {
StringBuffer buf = new StringBuffer();
BauernhofIterator it = new BauernhofIterator(this.keys);
Bauernhof b = null;
buf.append("Map enthaelt: \n");
while (it.hasNext()) {
b = it.getNext();
buf.append("KEY: " + b.getName());
buf.append('\n');
buf.append("VALUES:\n" + b.getTraktorList().toString());
buf.append('\n');
}
return buf.toString();
}
public void putTraktorList(Bauernhof b, TraktorList t_list) {
if (!containsKey(b)) {
this.keys.append(b);
}
b.addTraktorList(t_list);
// new entry consinsting of a farm b and its corresponding tractorlist t_list has been inserted
}
public Bauernhof getKey(Traktor t) {
BauernhofIterator it = new BauernhofIterator(this.keys);
Bauernhof b = null;
TraktorList list = null;
Traktor elem = null;
while (it.hasNext()) { // first iterate through farms
b = it.getNext();
list = b.getTraktorList();
TraktorIterator traktoren = new TraktorIterator(list);
while (traktoren.hasNext()) { // next iterate through corresponding lists of tractors
elem = traktoren.getNext();
if (elem.getID() == t.getID()) return b;
}
}
return null;
// returns: if tractor t is in map: corresponding farm b
// else: null
}
public void removeTraktor(Traktor t) {
Bauernhof b = getKey(t);
if (b == null) return;
b.remove(t);
// tractor t has been removed(only if t previously was in map!!)
}
public TraktorList getTraktorList(Bauernhof b) {
if (!containsKey(b)) return null;
return b.getTraktorList();
// returns: if farm b is in map: corresponding tractor list
// else: null
}
