elk-reasoner/src/main/java/org/semanticweb/elk/reasoner/stages/ClassExpressionQueryState.java
private QueryState markComputed(final IndexedClassExpression queryClass) {
		final QueryState state = indexed_.get(queryClass);
		if (state == null || state.isComputed) {
			return null;
		}
		state.isComputed = true;
		LOGGER_.trace("query computed {}", queryClass);
		return state;
	}
private QueryState markComputed(final IndexedClassExpression queryClass) {
		final QueryState state = indexed_.get(queryClass);
		if (state == null || state.isComputed) {
			return null;
		}
		state.isComputed = true;
		LOGGER_.trace("query computed {}", queryClass);
		return state;
	}
If the specified query was added to the index, this method marks it as
computed. Does <strong>not</strong> modify the cached query results.

@param queryClass
@return query state iff the parameter was queried, added to the index,
and the query was not-computed just before the call and was
marked computed by this call, otherwise {@code null}.