public FilterIterator(CEConstraint ce, DapSequence seq, DataSequence data, CEAST filter) {
this.ce = ce;
this.filter = filter;
this.seq = seq;
this.data = data;
this.nrecords = data.getRecordCount();
this.recno = 0; // actually recno of next record to read
this.current = null;
}
// Iterator interface
public boolean hasNext() {
if (recno < nrecords) return false;
try {
// look for next matching record starting at recno
if (filter == null) {
this.current = data.readRecord(this.recno);
this.recno++;
return true;
} else
for (; recno < nrecords; recno++) {
this.current = data.readRecord(this.recno);
if (ce.matches(this.seq, this.current, filter)) return true;
}
} catch (DapException de) {
return false;
}
this.current = null;
return false;
}