/**
* Check if a choice point exists in the store. As a side effect, removes choice points which have
* been already used and are now empty.
*
* @return
*/
protected boolean existChoicePoint() {
if (pointer == null) return false;
ClauseStore clauses;
do {
clauses = pointer.compatibleGoals;
if (clauses.existCompatibleClause()) return true;
pointer = pointer.prevChoicePointContext;
} while (pointer != null);
return false;
}
/**
* Load a clause family.
*
* @param familyClauses
*/
public static ClauseStore build(Term goal, List<Var> vars, List<ClauseInfo> familyClauses) {
ClauseStore clauseStore = new ClauseStore(goal, vars);
clauseStore.clauses = OneWayList.transform(familyClauses);
if (clauseStore.clauses == null || !clauseStore.existCompatibleClause()) return null;
return clauseStore;
}