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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 enumClass
* 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> enumClass,
int nValues, Consumer<E> action, Random rnd) {
E[] enumValues = enumClass.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 enumClass
* 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> enumClass,
Random rnd) {
E[] enumValues = enumClass.getEnumConstants();
return new FunctionalList<>(enumValues).randItem(rnd::nextInt);
}
}
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