blob: 880731219350fc947909061b6d4e543ad006dffd (
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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
package bjc.utils.data;
import bjc.utils.data.internals.BoundListHolder;
import bjc.utils.funcdata.FunctionalList;
import bjc.utils.funcdata.IList;
import java.util.function.Function;
import java.util.function.UnaryOperator;
/**
* A holder that represents a set of non-deterministic computations
*
* @author ben
*
* @param <ContainedType>
* The type of contained value
*/
public class ListHolder<ContainedType> implements IHolder<ContainedType> {
private IList<ContainedType> heldValues;
/**
* Create a new list holder
*
* @param values
* The possible values for the computation
*/
@SafeVarargs
public ListHolder(ContainedType... values) {
heldValues = new FunctionalList<>();
if (values != null) {
for (ContainedType containedValue : values) {
heldValues.add(containedValue);
}
}
}
private ListHolder(IList<ContainedType> toHold) {
heldValues = toHold;
}
@Override
public <BoundType> IHolder<BoundType> bind(Function<ContainedType, IHolder<BoundType>> binder) {
IList<IHolder<BoundType>> boundValues = heldValues.map(binder);
return new BoundListHolder<>(boundValues);
}
@Override
public <NewType> Function<ContainedType, IHolder<NewType>> lift(Function<ContainedType, NewType> func) {
return val -> {
return new ListHolder<>(new FunctionalList<>(func.apply(val)));
};
}
@Override
public <MappedType> IHolder<MappedType> map(Function<ContainedType, MappedType> mapper) {
IList<MappedType> mappedValues = heldValues.map(mapper);
return new ListHolder<>(mappedValues);
}
@Override
public IHolder<ContainedType> transform(UnaryOperator<ContainedType> transformer) {
heldValues = heldValues.map(transformer);
return this;
}
@Override
public <UnwrappedType> UnwrappedType unwrap(Function<ContainedType, UnwrappedType> unwrapper) {
return unwrapper.apply(heldValues.randItem());
}
@Override
public String toString() {
return String.format("ListHolder [heldValues=%s]", heldValues);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((heldValues == null) ? 0 : heldValues.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof ListHolder<?>))
return false;
ListHolder<?> other = (ListHolder<?>) obj;
if (heldValues == null) {
if (other.heldValues != null)
return false;
} else if (!heldValues.equals(other.heldValues))
return false;
return true;
}
}
|
