/**
* Builds a new Record from its textual representation
*
* @param name The owner name of the record.
* @param type The record's type.
* @param dclass The record's class.
* @param ttl The record's time to live.
* @param st A tokenizer containing the textual representation of the rdata.
* @param origin The default origin to be appended to relative domain names.
* @return The new record
* @throws IOException The text format was invalid.
*/
public static Record fromString(
Name name, int type, int dclass, long ttl, Tokenizer st, Name origin) throws IOException {
Record rec;
if (!name.isAbsolute()) throw new RelativeNameException(name);
Type.check(type);
DClass.check(dclass);
TTL.check(ttl);
Tokenizer.Token t = st.get();
if (t.type == Tokenizer.IDENTIFIER && t.value.equals("\\#")) {
int length = st.getUInt16();
byte[] data = st.getHex();
if (data == null) {
data = new byte[0];
}
if (length != data.length)
throw st.exception("invalid unknown RR encoding: " + "length mismatch");
DNSInput in = new DNSInput(data);
return newRecord(name, type, dclass, ttl, length, in);
}
st.unget();
rec = getEmptyRecord(name, type, dclass, ttl, true);
rec.rdataFromString(st, origin);
t = st.get();
if (t.type != Tokenizer.EOL && t.type != Tokenizer.EOF) {
throw st.exception("unexpected tokens at end of record");
}
return rec;
}
private long parseDouble(
Tokenizer st, String type, boolean required, long min, long max, long defaultValue)
throws IOException {
Tokenizer.Token token = st.get();
if (token.isEOL()) {
if (required) throw st.exception("Invalid LOC " + type);
st.unget();
return defaultValue;
}
String s = token.value;
if (s.length() > 1 && s.charAt(s.length() - 1) == 'm') s = s.substring(0, s.length() - 1);
try {
long value = (long) (100 * new Double(s).doubleValue());
if (value < min || value > max) throw st.exception("Invalid LOC " + type);
return value;
} catch (NumberFormatException e) {
throw st.exception("Invalid LOC " + type);
}
}