blob: e5b142272ca10f6c850727369d5ab94382b281a0 (
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
|
package bjc.utils.esodata;
/*
* Implements a spaghetti stack, which is a stack that is branched off of a
* parent stack.
*
* @param T The datatype stored in the stack.
* @author Ben Culkin
*/
class SpaghettiStack<T> extends Stack<T> {
private Stack<T> backing;
private Stack<T> parent;
/**
* Create a new empty spaghetti stack, off of the specified parent.
*
* @param par The parent stack
*/
public SpaghettiStack(Stack<T> par) {
backing = new SimpleStack<>();
parent = par;
}
@Override
public void push(T elm) {
backing.push(elm);
}
@Override
public T pop() {
if(backing.empty()) {
return parent.pop();
}
return backing.pop();
}
@Override
public T top() {
if(backing.empty()) {
return parent.top();
}
return backing.top();
}
@Override
public int size() {
return parent.size() + backing.size();
}
@Override
public boolean empty() {
return backing.empty() && parent.empty();
}
}
|
