blob: 4b842438f97235858c85d4ea3d8f98162dbbc38a (
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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
package bjc.utils.data;
import java.util.Iterator;
/**
* An iterator that repeats elements from a provided iterable.
*
* @author EVE
*
* @param <E>
* The type of the iterable.
*/
public class CircularIterator<E> implements Iterator<E> {
/*
* The iterable, and our current iterator into it.
*/
private Iterable<E> source;
private Iterator<E> curr;
/*
* Our current element.
*/
private E curElm;
/*
* Should we actually get new iterators, or just repeat the last
* element?
*/
private boolean doCircle;
/**
* Create a new circular iterator.
*
* @param src
* The iterable to iterate from.
*
* @param circ
* Should we actually do circular iteration, or just
* repeat the terminal element?
*/
public CircularIterator(Iterable<E> src, boolean circ) {
source = src;
curr = source.iterator();
doCircle = circ;
}
/**
* Create a new circular iterator that does actual circular iteration.
*
* @param src
* The iterable to iterate from.
*/
public CircularIterator(Iterable<E> src) {
this(src, true);
}
@Override
public boolean hasNext() {
// We always have something
return true;
}
@Override
public E next() {
if (!curr.hasNext()) {
if (doCircle)
curr = source.iterator();
else
return curElm;
}
curElm = curr.next();
return curElm;
}
@Override
public void remove() {
curr.remove();
}
}
|
