/**
* ***************************************************************** Iterating through all
* formulas, return a proof of an inconsistent or redundant one, if such a thing exists.
*/
public static String kbConsistencyCheck(KB kb) {
int timeout = 10;
int maxAnswers = 1;
String proof;
String result = null;
StringBuffer answer = new StringBuffer();
KB empty = makeEmptyKB("consistencyCheck");
System.out.println("=================== Consistency Testing ===================");
try {
Formula theQuery = new Formula();
Collection allFormulas = kb.formulaMap.values();
Iterator it = allFormulas.iterator();
while (it.hasNext()) {
Formula query = (Formula) it.next();
FormulaPreprocessor fp = new FormulaPreprocessor();
ArrayList processedQueries =
fp.preProcess(query, false, kb); // may be multiple because of row vars.
// System.out.println(" query = " + query);
// System.out.println(" processedQueries = " + processedQueries);
String processedQuery = null;
Iterator q = processedQueries.iterator();
System.out.println(
"INFO in Diagnostics.kbConsistencyCheck(): size = " + processedQueries.size());
while (q.hasNext()) {
Formula f = (Formula) q.next();
System.out.println("INFO in Diagnostics.kbConsistencyCheck(): formula = " + f.theFormula);
processedQuery = f.makeQuantifiersExplicit(false);
System.out.println(
"INFO in Diagnostics.kbConsistencyCheck(): processedQuery = " + processedQuery);
proof = StringUtils.join(empty.ask(processedQuery, timeout, maxAnswers), " ");
StringBuffer a = new StringBuffer();
a.append(reportAnswer(kb, proof, query, processedQuery, "Redundancy"));
// if (answer.length() != 0) return answer;
answer.append(a);
StringBuffer negatedQuery = new StringBuffer();
negatedQuery.append("(not " + processedQuery + ")");
proof = StringUtils.join(empty.ask(negatedQuery.toString(), timeout, maxAnswers), " ");
a.append(reportAnswer(kb, proof, query, negatedQuery.toString(), "Inconsistency"));
if (a.length() != 0) {
answer.append(a);
return answer.toString();
}
}
empty.tell(query.theFormula);
}
} catch (Exception ex) {
return ("Error in Diagnostics.kbConsistencyCheck() while executing query: "
+ ex.getMessage());
}
return "No contradictions or redundancies found.";
}
