Enumeration.ceylon

import ceylon.language.meta.model {
    ClassOrInterface
}

shared interface Enumeration<Element> of Element
        given Element satisfies Enumeration<Element> {
    shared static Element? byName(String name) {
        assert (is ClassOrInterface<Element> coi = `Element`);
        return coi.caseValues.find((element) => name == element.name);
    }
    shared formal String name;
}
shared abstract class Season(shared actual String name)
        of spring | summer | fall | winter
        satisfies Enumeration<Season> {}
shared object spring extends Season("spring") {}
shared object summer extends Season("summer") {}
shared object fall extends Season("fall") {}
shared object winter extends Season("winter") {}