AIMA.Core.Search.CSP.DomainRestoreInfo.isEmptyDomainFound C# (CSharp) Method

        public bool isEmptyDomainFound()
        {
            return emptyDomainObserved;
        }

        /**
         * Template method, which can be configured by overriding the three
         * primitive operations below.
         */
        private Assignment recursiveBackTrackingSearch(CSP csp,
                                                       Assignment assignment)
        {
            Assignment result = null;

            if (assignment.isComplete(csp.getVariables()))
            {
                result = assignment;
            }
            else
            {
                Variable var = selectUnassignedVariable(assignment, csp);
                foreach (Object value in orderDomainValues(var, assignment, csp))
                {
                    assignment.setAssignment(var, value);
                    fireStateChanged(assignment, csp);
                    if (assignment.isConsistent(csp.getConstraints(var)))
                    {
                        DomainRestoreInfo info = inference(var, assignment, csp);
                        if (!info.isEmpty())
                        {
                            fireStateChanged(csp);
                        }
                        if (!info.isEmptyDomainFound())
                        {
                            result = recursiveBackTrackingSearch(csp, assignment);
                            if (result != null)
                            {
                                break;
                            }
                        }
                        info.restoreDomains(csp);
                    }
                    assignment.removeAssignment(var);
                }
            }
            return(result);
        }