public static <TO, FROM> List<TO> mapFilterNulls(
Function<FROM, TO> converter, Collection<FROM> fromCollection) {
ArrayList<TO> toList = new ArrayList<>(fromCollection.size());
for (FROM from : fromCollection) {
TO converted = converter.apply(from);
if (converted != null) {
toList.add(converted);
}
}
return toList;
}
public static Collection toCollection(Object value) {
if (value instanceof Collection) {
return (Collection) value;
} else if (value == null) {
return new ArrayList();
} else if (value instanceof Map) {
return ((Map) value).entrySet();
} else {
ArrayList list = new ArrayList(Boon.len(value));
Iterator<Object> iterator = iterator(Typ.object, value);
while (iterator.hasNext()) {
list.add(iterator.next());
}
return list;
}
}
@SuppressWarnings({"rawtypes", "unchecked"})
public static List toList(Object value) {
if (value instanceof List) {
return (List) value;
} else if (value instanceof Collection) {
return new ArrayList((Collection) value);
} else if (value == null) {
return new ArrayList();
} else if (value instanceof Map) {
return new ArrayList(((Map) value).entrySet());
} else {
ArrayList list = new ArrayList(Boon.len(value));
Iterator<Object> iterator = iterator(Typ.object, value);
while (iterator.hasNext()) {
list.add(iterator.next());
}
return list;
}
}