Method floor

base/src/main/java/net/time4j/engine/StdOperator.java:346–360

(
        ChronoEntity<T> entity,
        ChronoElement<V> element
    )

    }

    private <V> T floor(
        ChronoEntity<T> entity,
        ChronoElement<V> element
    ) {

        T ctx = entity.getContext();
        ChronoElement<?> e = element;

        while ((e = ctx.getChronology().getRule(e).getChildAtFloor(ctx)) != null) {
            ctx = withFloor(ctx, e);
        }

        return ctx;

    }

    private <V> T ceiling(
        ChronoEntity<T> entity,