Implementation of the ReversedEnumMap as described at: http://www.javaspecialists.co.za/archive/Issue113.html. The implementation uses google-guava as a dependency but it can be easily removed.

Identifiable.java

public interface Identifiable<T> {
    T getId();
}

IdentifiableEnumMap.java

import com.google.common.base.Optional;

import java.util.HashMap;
import java.util.Map;

import static com.google.common.base.Preconditions.checkNotNull;

public final class IdentifiableEnumMap<T, V extends Enum<V> & Identifiable<T>> {
    private Map<T, V> map = new HashMap<T, V>();

    public IdentifiableEnumMap(Class<V> valueType) {
        for (V v : valueType.getEnumConstants()) {
            map.put(v.getId(), v);
        }
    }

    public Optional<V> get(T id) {
        return Optional.fromNullable(map.get(checkNotNull(id)));
    }

}