/**
* Collect a set of clauses from a list of given sentences.
*
* @param cnfSentences
* a list of CNF sentences from which to collect clauses.
* @return a set of all contained clauses.
* @throws IllegalArgumentException
* if any of the given sentences are not in CNF.
*/
public static ISet <Clause> getClausesFrom(params Sentence[] cnfSentences)
{
ISet <Clause> result = CollectionFactory.CreateSet <Clause>();
ClauseCollector clauseCollector = new ClauseCollector();
foreach (Sentence cnfSentence in cnfSentences)
{
result = cnfSentence.accept(clauseCollector, result);
}
return(result);
}
/**
* Returns the specified sentence in its logically equivalent conjunction of
* clauses.
*
* @param s
* a propositional logic sentence
*
* @return the input sentence converted to it logically equivalent
* conjunction of clauses.
*/
public static ConjunctionOfClauses convert(Sentence s)
{
ConjunctionOfClauses result = null;
Sentence cnfSentence = ConvertToCNF.convert(s);
ICollection <Clause> clauses = CollectionFactory.CreateQueue <Clause>();
clauses.AddAll(ClauseCollector.getClausesFrom(cnfSentence));
result = new ConjunctionOfClauses(clauses);
return(result);
}