/**
* Checks the items for equivalence.
*
* @param ii input info
* @param it item to be compared
* @return result of check
* @throws QueryException query exception
*/
public final boolean equiv(final InputInfo ii, final Item it) throws QueryException {
// check if both values are NaN, or if values are equal..
return (this == Dbl.NAN || this == Flt.NAN) && it.num() && Double.isNaN(it.dbl(ii))
|| comparable(it) && eq(ii, it);
}
/**
* Checks if the specified item is a double. Returns the double or throws an exception.
*
* @param it item
* @return double
* @throws QueryException query exception
*/
protected final double toDouble(final Item it) throws QueryException {
if (checkNoEmpty(it, AtomType.DBL).type.isNumberOrUntyped()) return it.dbl(info);
throw numberError(this, it);
}
/**
* Checks if the specified, non-empty item is a double. Returns the double or throws an exception.
*
* @param it item to be checked
* @return number
* @throws QueryException query exception
*/
private ANum toNumber(final Item it) throws QueryException {
if (it.type.isUntyped()) return Dbl.get(it.dbl(info));
if (it instanceof ANum) return (ANum) it;
throw numberError(this, it);
}
@Override
public final Item test(final QueryContext qc, final InputInfo ii) throws QueryException {
final Item it = ebv(qc, info);
return (it instanceof ANum ? it.dbl(info) == qc.pos : it.bool(info)) ? it : null;
}