/**
* Builds a new Record from its textual representation
*
* @param name The owner name of the record.
* @param type The record's type.
* @param defaultClass 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, DClass defaultClass, long ttl, Tokenizer st, Name origin)
throws IOException {
Record rec;
if (!name.isAbsolute()) {
throw new RelativeNameException(name);
}
Type.check(type);
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, defaultClass, ttl, length, in);
}
st.unget();
rec = getEmptyRecord(name, type, defaultClass, 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;
}
/** Converts a Record into a String representation */
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(name);
if (sb.length() < 8) {
sb.append("\t");
}
if (sb.length() < 16) {
sb.append("\t");
}
sb.append("\t");
if (Options.check("BINDTTL")) {
sb.append(TTL.format(ttl));
} else {
sb.append(ttl);
}
sb.append("\t");
if (dclass != DClass.IN || !Options.check("noPrintIN")) {
sb.append(dclass.getName());
sb.append("\t");
}
sb.append(Type.string(type));
String rdata = rrToString();
if (!rdata.equals("")) {
sb.append("\t");
sb.append(rdata);
}
return sb.toString();
}
/**
* Creates a new empty record, with the given parameters.
*
* @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.
* @return An object of a subclass of Record
*/
public static Record newRecord(Name name, int type, DClass dclass, long ttl) {
if (!name.isAbsolute()) {
throw new RelativeNameException(name);
}
Type.check(type);
TTL.check(ttl);
return getEmptyRecord(name, type, dclass, ttl, false);
}
protected Record(Name name, int type, DClass dclass, long ttl) {
if (!name.isAbsolute()) {
throw new RelativeNameException(name);
}
Type.check(type);
TTL.check(ttl);
this.name = name;
this.type = type;
this.dclass = dclass;
this.ttl = ttl;
}
private static Record getEmptyRecord(
Name name, int type, DClass dclass, long ttl, boolean hasData) {
Record proto, rec;
if (hasData) {
proto = Type.getProto(type);
if (proto != null) {
rec = proto.getObject();
} else {
rec = new UNKRecord();
}
} else {
rec = new EmptyRecord();
}
rec.name = name;
rec.type = type;
rec.dclass = dclass;
rec.ttl = ttl;
return rec;
}
/**
* Creates a new record, with the given parameters.
*
* @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 length The length of the record's data.
* @param data The rdata of the record, in uncompressed DNS wire format. Only the first length
* bytes are used.
*/
public static Record newRecord(
Name name, int type, DClass dclass, long ttl, int length, byte[] data) {
if (!name.isAbsolute()) {
throw new RelativeNameException(name);
}
Type.check(type);
TTL.check(ttl);
DNSInput in;
if (data != null) {
in = new DNSInput(data);
} else {
in = null;
}
try {
return newRecord(name, type, dclass, ttl, length, in);
} catch (IOException e) {
return null;
}
}