blob: 82a29a2965c8bdadab922ba05d0341b3e4aa689d (
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 bjc.utils.funcutils;
import java.util.Random;
import java.util.function.Consumer;
import bjc.utils.funcdata.FunctionalList;
import bjc.utils.funcdata.IList;
/**
* Utility methods on enums
*
* @author ben
*
*/
public class EnumUtils {
/**
* Do an action for a random number of enum values
*
* @param <E>
* The type of the enum
* @param clasz
* The enum class
* @param nValues
* The number of values to execute the action on
* @param action
* The action to perform on random values
* @param rnd
* The source of randomness to use
*/
public static <E extends Enum<E>> void doForValues(Class<E> clasz, int nValues, Consumer<E> action,
Random rnd) {
E[] enumValues = clasz.getEnumConstants();
IList<E> valueList = new FunctionalList<>(enumValues);
int randomValueCount = enumValues.length - nValues;
for (int i = 0; i <= randomValueCount; i++) {
E rDir = valueList.randItem(rnd::nextInt);
valueList.removeMatching(rDir);
}
valueList.forEach(action);
}
/**
* Get a random value from an enum
*
* @param <E>
* The type of the enum
* @param clasz
* The class of the enum
* @param rnd
* The random source to use
* @return A random value from the specified enum
*/
public static <E extends Enum<E>> E getRandomValue(Class<E> clasz, Random rnd) {
E[] enumValues = clasz.getEnumConstants();
return new FunctionalList<>(enumValues).randItem(rnd::nextInt);
}
}
|
