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);
}
/**
* Adds a record to the Zone
*
* @param r The record to be added
* @see Record
*/
public void addRecord(Record r) {
Name name = r.getName();
short type = r.getRRsetType();
RRset rrset = (RRset) findExactSet(name, type);
if (rrset == null) addSet(name, type, rrset = new RRset());
rrset.addRR(r);
}
/**
* Determines if an RRset with the given name and type is already present in the given section.
*
* @see RRset
* @see Section
*/
public boolean findRRset(Name name, int type, int section) {
if (sections[section] == null) return false;
for (int i = 0; i < sections[section].size(); i++) {
Record r = (Record) sections[section].get(i);
if (r.getType() == type && name.equals(r.getName())) return true;
}
return false;
}
/**
* Removes a record from the Zone
*
* @param r The record to be removed
* @see Record
*/
public void removeRecord(Record r) {
Name name = r.getName();
short type = r.getRRsetType();
RRset rrset = (RRset) findExactSet(name, type);
if (rrset != null) {
rrset.deleteRR(r);
if (rrset.size() == 0) removeSet(name, type, rrset);
}
}
private final void maybeAddRecord(Record record) throws IOException {
int rtype = record.getType();
Name name = record.getName();
if (rtype == Type.SOA && !name.equals(origin)) {
throw new IOException("SOA owner " + name + " does not match zone origin " + origin);
}
if (name.subdomain(origin)) addRecord(record);
}
/**
* Removes a record from the Zone
*
* @param r The record to be removed
* @see Record
*/
public void removeRecord(Record r) {
Name name = r.getName();
int rtype = r.getRRsetType();
synchronized (this) {
RRset rrset = findRRset(name, rtype);
if (rrset == null) return;
rrset.deleteRR(r);
if (rrset.size() == 0) removeRRset(name, rtype);
}
}
/**
* Adds a Record to the Zone
*
* @param r The record to be added
* @see Record
*/
public void addRecord(Record r) {
Name name = r.getName();
int rtype = r.getRRsetType();
synchronized (this) {
RRset rrset = findRRset(name, rtype);
if (rrset == null) {
rrset = new RRset(r);
addRRset(name, rrset);
} else {
rrset.addRR(r);
}
}
}
/**
* Asynchronously sends a message to a single server, registering a listener to receive a callback
* on success or exception. Multiple asynchronous lookups can be performed in parallel. Since the
* callback may be invoked before the function returns, external synchronization is necessary.
*
* @param query The query to send
* @param listener The object containing the callbacks.
* @return An identifier, which is also a parameter in the callback
*/
public Object sendAsync(final Message query, final ResolverListener listener) {
final Object id;
synchronized (this) {
id = new Integer(uniqueID++);
}
Record question = query.getQuestion();
String qname;
if (question != null) qname = question.getName().toString();
else qname = "(none)";
String name = this.getClass() + ": " + qname;
Thread thread = new ResolveThread(this, query, id, listener);
thread.setName(name);
thread.setDaemon(true);
thread.start();
return id;
}
private final void maybeAddRecord(Record record, Cache cache, Object source) throws IOException {
int type = record.getType();
Name name = record.getName();
if (type == Type.SOA) {
if (!name.equals(origin))
throw new IOException("SOA owner " + name + " does not match zone origin " + origin);
else {
setOrigin(origin);
dclass = record.getDClass();
}
}
if (origin == null && type != Type.SOA)
throw new IOException("non-SOA record seen at " + name + " with no origin set");
if (name.subdomain(origin)) addRecord(record);
else if (cache != null) cache.addRecord(record, Credibility.GLUE, source);
}
/**
* Adds a record to the Cache.
*
* @param r The record to be added
* @param cred The credibility of the record
* @param o The source of the record (this could be a Message, for example)
* @see Record
*/
public void addRecord(Record r, byte cred, Object o) {
Name name = r.getName();
short type = r.getRRsetType();
if (!Type.isRR(type)) return;
boolean addrrset = false;
Element element = (Element) findExactSet(name, type);
if (element == null || cred > element.credibility) {
RRset rrset = new RRset();
rrset.addRR(r);
addRRset(rrset, cred);
} else if (cred == element.credibility) {
if (element instanceof PositiveElement) {
PositiveElement pe = (PositiveElement) element;
pe.rrset.addRR(r);
}
}
}
private static boolean sameSet(Record r1, Record r2) {
return (r1.getRRsetType() == r2.getRRsetType()
&& r1.getDClass() == r2.getDClass()
&& r1.getName().equals(r2.getName()));
}