Enums.java

package no.java.incogito;

import fj.F;
import fj.F2;
import static fj.Function.curry;
import fj.data.Option;
import static fj.data.Option.none;
import static fj.data.Option.some;
import fj.pre.Ord;
import fj.pre.Ordering;
import fj.pre.Equal;
import static fj.pre.Equal.anyEqual;

/**
 * @author <a href="mailto:trygvis@java.no">Trygve Laugstøl</a>
 * @version $Id$
 */
public class Enums {

    public static <T extends Enum<T>> F<T, String> toString_() {
        return new F<T, String>() {
            public String f(T anEnum) {
                return anEnum.toString();
            }
        };
    }

    public static <T extends Enum<T>> F<T, String> name_() {
        return new F<T, String>() {
            public String f(T anEnum) {
                return anEnum.name();
            }
        };
    }

    public static <T extends Enum<T>> F<Class<T>, F<String, Option<T>>> valueOf() {
        return curry(new F2<Class<T>, String, Option<T>>() {
            public Option<T> f(Class<T> klass, String string) {
                try {
                    return some(Enum.valueOf(klass, string));
                } catch (Exception e) {
                    return none();
                }
            }
        });
    }

    public static <A extends Enum> Ord<A> ord() {
        return Ord.ord(curry(new F2<A, A, Ordering>() {
            public Ordering f(A a, A b) {
                return Ord.stringOrd.compare(a.name(), b.name());
            }
        }));
    }

    public static <E extends Enum> Equal<E> equal() {
        return anyEqual();
    }
}