/** Creates a Cache which initially contains all records in the specified file. */
public Cache(String file) throws IOException {
super(true);
cleaner = new CacheCleaner();
Master m = new Master(file);
Record record;
while ((record = m.nextRecord()) != null) addRecord(record, Credibility.HINT, m);
}
/**
* Creates a Zone from the records in the specified master file. All records that do not belong in
* the Zone are added to the specified Cache.
*
* @see Cache
* @see Master
*/
public Zone(String file, Cache cache, Name initialOrigin) throws IOException {
super(false);
Master m = new Master(file, initialOrigin);
Record record;
origin = initialOrigin;
while ((record = m.nextRecord()) != null) maybeAddRecord(record, cache, file);
validate();
}
/**
* Creates a Zone from the records in the specified master file.
*
* @param zone The name of the zone.
* @param file The master file to read from.
* @see Master
*/
public Zone(Name zone, String file) throws IOException {
data = new HashMap();
type = PRIMARY;
if (zone == null) throw new IllegalArgumentException("no zone name specified");
Master m = new Master(file, zone);
Record record;
origin = zone;
while ((record = m.nextRecord()) != null) maybeAddRecord(record);
validate();
}
/** Returns the next record in the master file */
public Record nextRecord() throws IOException {
String line;
MyStringTokenizer st;
if (included != null) {
Record rec = included.nextRecord();
if (rec != null) return rec;
included = null;
}
while (true) {
line = readExtendedLine(br);
if (line == null) return null;
if (line.length() == 0 || line.startsWith(";")) continue;
boolean space = line.startsWith(" ") || line.startsWith("\t");
st = new MyStringTokenizer(line);
String s = st.nextToken();
if (s.equals("$ORIGIN")) {
origin = parseOrigin(st);
continue;
}
if (s.equals("$TTL")) {
defaultTTL = parseTTL(st);
continue;
}
if (s.equals("$INCLUDE")) {
parseInclude(st);
/*
* If we continued, we wouldn't be looking in
* the new file. Recursing works better.
*/
return nextRecord();
} else if (s.charAt(0) == '$') throw new IOException("Invalid directive: " + s);
st.putBackToken(s);
return (last = parseRR(st, space, last, origin));
}
}