/**
* Perform a query.
*
* @param line The query.
* @return The probability.
*/
public double performQuery(String line) {
if (this.query == null) {
throw new BayesianError("This Bayesian network does not have a query to define.");
}
ParseProbability parse = new ParseProbability(this);
ParsedProbability parsedProbability = parse.parse(line);
// create a temp query
BayesianQuery q = this.query.clone();
// first, mark all events as hidden
q.reset();
// deal with evidence (input)
for (ParsedEvent parsedEvent : parsedProbability.getGivenEvents()) {
BayesianEvent event = this.requireEvent(parsedEvent.getLabel());
q.defineEventType(event, EventType.Evidence);
q.setEventValue(event, parsedEvent.resolveValue(event));
}
// deal with outcome (output)
for (ParsedEvent parsedEvent : parsedProbability.getBaseEvents()) {
BayesianEvent event = requireEvent(parsedEvent.getLabel());
q.defineEventType(event, EventType.Outcome);
q.setEventValue(event, parsedEvent.resolveValue(event));
}
q.locateEventTypes();
q.execute();
return q.getProbability();
}
/**
* Define a relationship.
*
* @param line The relationship to define.
*/
public void defineRelationship(String line) {
ParseProbability parse = new ParseProbability(this);
ParsedProbability parsedProbability = parse.parse(line);
parsedProbability.defineRelationships(this);
}
/**
* Define the probability for an event.
*
* @param line The event.
* @param probability The probability.
*/
public void defineProbability(String line, double probability) {
ParseProbability parse = new ParseProbability(this);
ParsedProbability parsedProbability = parse.parse(line);
parsedProbability.defineTruthTable(this, probability);
}
