public static Map getPreferencePriorityEvents() {
HashMap map = new HashMap();
List h = getPreferenceList(PREFS_HIGHPRIORITY_EVENTS);
List m = getPreferenceList(PREFS_MEDIUMPRIORITY_EVENTS);
List l = getPreferenceList(PREFS_LOWPRIORITY_EVENTS);
// preferences not set, read from sakai.properties
if (h == null && m == null && l == null) {
h = getDefaultListFromSakaiProperties(PREFS_HIGHPRIORITY_EVENTS);
m = getDefaultListFromSakaiProperties(PREFS_MEDIUMPRIORITY_EVENTS);
l = getDefaultListFromSakaiProperties(PREFS_LOWPRIORITY_EVENTS);
}
if (h == null) h = new ArrayList();
if (m == null) m = new ArrayList();
if (l == null) l = new ArrayList();
// make sure all available events are listed
// no pass-by-reference in java, must use a work-around...
List temp = new ArrayList();
temp.addAll(EventTypes.getEventTypes());
PairList lists = new PairList(h, temp);
lists = validateEventList(lists);
h = lists.dataList;
lists.dataList = m;
lists = validateEventList(lists);
m = lists.dataList;
lists.dataList = l;
lists = validateEventList(lists);
l = lists.dataList;
// add all non-specified events to low priority list
l.addAll(lists.tempList);
// sort lists
// Collections.sort(h);
// Collections.sort(m);
// Collections.sort(l);
map.put(PREFS_HIGHPRIORITY_EVENTS, h);
map.put(PREFS_MEDIUMPRIORITY_EVENTS, m);
map.put(PREFS_LOWPRIORITY_EVENTS, l);
return map;
}
/**
* Foreach 'list' entry A, remove it from 'temp'. If A doesn't exist in 'temp', remove it from
* 'list'.
*
* @param list A event priority List.
* @param temp A List with all events.
*/
private static PairList validateEventList(PairList lists) {
List temp = lists.tempList;
List list = lists.dataList;
if (list == null) {
return lists;
}
List toRemoveFromList = new ArrayList();
Iterator iL = list.iterator();
while (iL.hasNext()) {
Object e = iL.next();
if (temp.contains(e)) temp.remove(e);
else toRemoveFromList.add(e);
}
Iterator iR = toRemoveFromList.iterator();
while (iR.hasNext()) {
Object e = iR.next();
list.remove(e);
}
lists.dataList = list;
lists.tempList = temp;
return lists;
}