@SuppressWarnings("cast")
public boolean evaluate(T candidate) {
Iterator<?> lValues = valueRetriever.retrieve(candidate);
if (rValue == null && !lValues.hasNext()) {
// if there are no values on the right hand side then it counts as null
return true;
}
while (lValues.hasNext()) {
Object lValue = lValues.next();
final boolean comparisonResult;
switch (operator) {
case EQUAL:
comparisonResult = compare((Comparable<?>) lValue, rValue) == 0;
break;
case GREATER_THAN:
comparisonResult = compare((Comparable<?>) lValue, rValue) > 0;
break;
case GREATER_OR_EQUAL:
comparisonResult = compare((Comparable<?>) lValue, rValue) >= 0;
break;
case LESS_THAN:
comparisonResult = compare((Comparable<?>) lValue, rValue) < 0;
break;
case LESS_OR_EQUAL:
comparisonResult = compare((Comparable<?>) lValue, rValue) <= 0;
break;
default:
throw new UnsupportedOperationException();
}
if (comparisonResult) {
// terminate early
return true;
}
}
return false;
}
@Override
public String toString() {
return valueRetriever.toString() + operator + rValue;
}
public Cost getCost() {
return valueRetriever.getCost();
}