Enums.java

import java.util.EnumSet;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;

public class Enums {

	public static <E extends Enum<E>, T> Optional<E> lookup(Class<E> elementType, Function<E, T> extractor, T value) {
		return EnumSet.allOf(elementType).stream()
				.filter(candidate -> Objects.equals(extractor.apply(candidate), value)).findFirst();
	}

}

enum MyEnum {

	CONSTANT_NAME("constant name");

	private final String constantName;

	MyEnum(String contantName) {
		this.constantName = contantName;
	}

	public static Optional<MyEnum> byConstantName(String name) {
		return Enums.lookup(MyEnum.class, f -> f.constantName, name);
	}

}