/**
* @return the result tuple
* @exception JoinsException some join exception
* @exception IOException I/O errors
* @exception InvalidTupleSizeException invalid tuple size
* @exception InvalidTypeException tuple type not valid
* @exception PageNotReadException exception from lower layer
* @exception PredEvalException exception from PredEval class
* @exception UnknowAttrType attribute type unknown
* @exception FieldNumberOutOfBoundException array out of bounds
* @exception WrongPermat exception for wrong FldSpec argument
*/
public Tuple get_next()
throws JoinsException, IOException, InvalidTupleSizeException, InvalidTypeException,
PageNotReadException, PredEvalException, UnknowAttrType, FieldNumberOutOfBoundException,
WrongPermat {
RID rid = new RID();
;
while (true) {
if ((tuple1 = scan.getNext(rid)) == null) {
return null;
}
tuple1.setHdr(in1_len, _in1, s_sizes);
if (PredEval.Eval(OutputFilter, tuple1, null, _in1, null) == true) {
Projection.Project(tuple1, _in1, Jtuple, perm_mat, nOutFlds);
return Jtuple;
}
}
}
