/** Removes the given set with the name and type. The data contained in the set is abstract. */
protected void removeSet(Name name, short type, TypedObject set) {
TypeMap nameInfo = findName(name);
if (nameInfo == null) return;
Object o = nameInfo.get(type);
if (o != set && type != Type.CNAME) {
type = Type.CNAME;
o = nameInfo.get(type);
}
if (o == set) {
synchronized (nameInfo) {
nameInfo.remove(type);
}
if (nameInfo.isEmpty()) data.remove(name);
}
}
/** Finds all matching sets or something that causes the lookup to stop. */
protected Object findSets(Name name, short type) {
Object bestns = null;
Object o;
Name tname;
int labels;
int olabels;
int tlabels;
if (!name.subdomain(origin)) return null;
labels = name.labels();
olabels = origin.labels();
for (tlabels = olabels; tlabels <= labels; tlabels++) {
if (tlabels == olabels) tname = origin;
else if (tlabels == labels) tname = name;
else tname = new Name(name, labels - tlabels);
TypeMap nameInfo = findName(tname);
if (nameInfo == null) continue;
/* If this is an ANY lookup, return everything. */
if (tlabels == labels && type == Type.ANY) return nameInfo.getAll();
/* Look for an NS */
if (tlabels > olabels || isCache) {
o = nameInfo.get(Type.NS);
if (o != null) {
if (isCache) bestns = o;
else return o;
}
}
/* If this is the name, look for the actual type. */
if (tlabels == labels) {
o = nameInfo.get(type);
if (o != null) return o;
}
/* If this is the name, look for a CNAME */
if (tlabels == labels) {
o = nameInfo.get(Type.CNAME);
if (o != null) return o;
}
/* Look for a DNAME, unless this is the actual name */
if (tlabels < labels) {
o = nameInfo.get(Type.DNAME);
if (o != null) return o;
}
/*
* If this is the name and this is a cache, look for an
* NXDOMAIN entry.
*/
if (tlabels == labels && isCache) {
o = nameInfo.get((short) 0);
if (o != null) return o;
}
/*
* If this is the name and we haven't matched anything,
* just return the name.
*/
if (tlabels == labels) return nameInfo;
}
if (bestns == null) return null;
else return bestns;
}
/**
* Finds all sets that exactly match. This does not traverse CNAMEs or handle Type ANY queries.
*/
protected Object findExactSet(Name name, short type) {
TypeMap nameInfo = findName(name);
if (nameInfo == null) return null;
return nameInfo.get(type);
}