/**
* Grounds the parameter by assigning the values in the assignment to the unknown variables
*
* @param input the grounding assignment
* @return the grounded parameter
*/
public Parameter ground(Assignment input) {
if (input.containsVars(expression.getVariables())) {
try {
double result = expression.evaluate(input);
return new FixedParameter(result);
} catch (IllegalArgumentException e) {
log.warning("cannot ground " + expression + " with " + input);
}
}
String filled = expression.toString();
for (String u : input.getVariables()) {
filled.replaceAll(u, input.getValue(u).toString());
}
return new ComplexParameter(filled);
}
/**
* Returns the groundings associated with the rule case, given the input assignment
*
* @param input the input assignment
* @return the resulting groundings
*/
public RuleGrounding getGroundings(Assignment input) {
RuleGrounding groundings = new RuleGrounding();
groundings.add(condition.getGroundings(input));
if (ruleType == RuleType.UTIL) {
boolean actionVars = input.containsVars(output.getOutputVariables());
for (Effect e : getEffects()) {
if (actionVars) {
Condition co = e.convertToCondition();
RuleGrounding effectGrounding = co.getGroundings(input);
groundings.add(effectGrounding);
} else {
Set<String> slots = e.getValueSlots();
slots.removeAll(input.getVariables());
groundings.add(Assignment.createOneValue(slots, ""));
}
}
}
return groundings;
}
