/**
* Checks if the specified expression yields an item of the specified atomic type. Returns the
* item or throws an exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @param type type to be checked
* @return item
* @throws QueryException query exception
*/
protected Item checkAtomic(final Expr ex, final QueryContext qc, final Type type)
throws QueryException {
return checkType(ex.atomItem(qc, info), type);
}
/**
* Checks if the specified expression yields a string or binary item.
*
* @param ex expression to be evaluated
* @param qc query context
* @return byte array
* @throws QueryException query exception
*/
protected final byte[] toBytes(final Expr ex, final QueryContext qc) throws QueryException {
return toBytes(ex.atomItem(qc, info));
}
/**
* Checks if the specified expression yields a QName. Returns the item or throws an exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @param empty allow empty result
* @return QNm item
* @throws QueryException query exception
*/
protected final QNm toQNm(final Expr ex, final QueryContext qc, final boolean empty)
throws QueryException {
return toQNm(ex.atomItem(qc, info), empty);
}
/**
* Checks if the evaluated expression yields a non-empty item. Returns the atomized item or throws
* an exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @return atomized item
* @throws QueryException query exception
*/
protected final Item toAtomItem(final Expr ex, final QueryContext qc) throws QueryException {
return checkNoEmpty(ex.atomItem(qc, info));
}
/**
* Checks if the specified expression yields a binary item. Returns the binary item or throws an
* exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @return binary item
* @throws QueryException query exception
*/
protected final Bin toBin(final Expr ex, final QueryContext qc) throws QueryException {
return toBin(ex.atomItem(qc, info));
}
/**
* Checks if the specified expression yields a float. Returns the float or throws an exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @return float
* @throws QueryException query exception
*/
protected final float toFloat(final Expr ex, final QueryContext qc) throws QueryException {
final Item it = ex.atomItem(qc, info);
if (checkNoEmpty(it, AtomType.FLT).type.isNumberOrUntyped()) return it.flt(info);
throw numberError(this, it);
}
/**
* Checks if the specified expression yields a number or {@code null}. Returns the number, {@code
* null}, or throws an exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @return double
* @throws QueryException query exception
*/
protected final ANum toNumber(final Expr ex, final QueryContext qc) throws QueryException {
final Item it = ex.atomItem(qc, info);
return it == null ? null : toNumber(it);
}
/**
* Checks if the specified expression yields a double. Returns the double or throws an exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @return double
* @throws QueryException query exception
*/
protected final double toDouble(final Expr ex, final QueryContext qc) throws QueryException {
return toDouble(ex.atomItem(qc, info));
}
/**
* Checks if the specified expression yields a string or an empty sequence. Returns a value as
* token or throws an exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @return token (empty string if result is an empty sequence)
* @throws QueryException query exception
*/
protected final byte[] toEmptyToken(final Expr ex, final QueryContext qc) throws QueryException {
final Item it = ex.atomItem(qc, info);
return it == null ? EMPTY : toToken(it);
}
/**
* Checks if the specified expression yields a string. Returns a value as token or throws an
* exception.
*
* @param ex expression to be evaluated
* @param qc query context
* @return token
* @throws QueryException query exception
*/
protected final byte[] toToken(final Expr ex, final QueryContext qc) throws QueryException {
final Item it = ex.atomItem(qc, info);
if (it == null) throw EMPTYFOUND_X.get(info, AtomType.STR);
return toToken(it);
}