Method fetchNextSolution

src/main/java/org/jpl7/Query.java:428–444

Tell Prolog engine to fetch the next solution for the current active query (like hitting ;) If there are no more solutions, then just close the query @return whether a new solutions was found or there are no more solutions @throws PrologException with the term of the error from Prolog (e.g., syntax

()

     * @throws PrologException with the term of the error from Prolog (e.g., syntax error in query or non existence of predicates)
     */
	private boolean fetchNextSolution() { // try to get the next solution; if none,
									// close the query;
		if (Prolog.next_solution(qid)) {
			return true;
		} else { // if failure was due to throw/1, build exception term and
					// throw it
			term_t exception_term_t = Prolog.exception(qid);
			if (exception_term_t.value != 0L) {
				Term exception_term = Term.getTerm(new HashMap<term_t, Variable>(), exception_term_t);
				close();
				throw new PrologException(exception_term);
			} else {	// no more solution, close the query
				close();
				return false;
			}
		}
	}

	/**
     * Returns the next solution of the query