blob: 15c45534bbd1dfcbbea68461e48e50a4d5498501 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
package io.dico.dicore.event;
public class ChainedListenerHandles {
private ChainedListenerHandles() {
}
private static final ChainedListenerHandle empty = new ChainedListenerHandle() {
@Override
public void register() {
}
public void unregister() {
}
@Override
public ChainedListenerHandle withElement(ListenerHandle other) {
return ChainedListenerHandles.singleton(other);
}
@Override
public int getElementCount() {
return 0;
}
@Override
public ListenerHandle getDelegateOfLastNode() {
return null;
}
};
public static ChainedListenerHandle empty() {
return empty;
}
public static ChainedListenerHandle singleton(ListenerHandle element) {
if (element instanceof ChainedListenerHandle) {
return (ChainedListenerHandle) element;
}
if (element == null) {
return empty();
}
return new ChainedListenerHandle() {
@Override
public void register() {
element.register();
}
public void unregister() {
element.unregister();
}
@Override
public ListenerHandle getDelegateOfLastNode() {
return element;
}
};
}
}
|