private Record parseRR(MyStringTokenizer st, boolean useLast, Record last, Name origin)
throws IOException {
Name name;
int ttl;
short type, dclass;
if (!useLast) name = new Name(st.nextToken(), origin);
else name = last.getName();
String s = st.nextToken();
try {
ttl = TTL.parseTTL(s);
s = st.nextToken();
} catch (NumberFormatException e) {
if (!useLast || last == null) ttl = defaultTTL;
else ttl = last.getTTL();
}
if ((dclass = DClass.value(s)) > 0) s = st.nextToken();
else dclass = DClass.IN;
if ((type = Type.value(s)) < 0) throw new IOException("Parse error");
return Record.fromString(name, type, dclass, ttl, st, origin);
}
/**
* Constructs and returns the next record in the expansion.
*
* @throws IOException The name or rdata was invalid after substitutions were performed.
*/
public Record nextRecord() throws IOException {
if (current > end) return null;
String namestr = substitute(namePattern, current);
Name name = Name.fromString(namestr, origin);
String rdata = substitute(rdataPattern, current);
current += step;
return Record.fromString(name, type, dclass, ttl, rdata, origin);
}
/**
* Constructs and returns all records in the expansion.
*
* @throws IOException The name or rdata of a record was invalid after substitutions were
* performed.
*/
public Record[] expand() throws IOException {
List list = new ArrayList();
for (long i = start; i < end; i += step) {
String namestr = substitute(namePattern, current);
Name name = Name.fromString(namestr, origin);
String rdata = substitute(rdataPattern, current);
list.add(Record.fromString(name, type, dclass, ttl, rdata, origin));
}
return (Record[]) list.toArray(new Record[list.size()]);
}