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// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
package org.xbill.DNS;
import java.io.*;
import java.util.*;
/**
* Next name - this record contains the following name in an ordered list
* of names in the zone, and a set of types for which records exist for
* this name. The presence of this record in a response signifies a
* failed query for data in a DNSSEC-signed zone.
*
* @author Brian Wellington
*/
public class NXTRecord extends Record {
private static final long serialVersionUID = -8851454400765507520L;
private Name next;
private BitSet bitmap;
NXTRecord() {}
Record
getObject() {
return new NXTRecord();
}
/**
* Creates an NXT Record from the given data
* @param next The following name in an ordered list of the zone
* @param bitmap The set of type for which records exist at this name
*/
public
NXTRecord(Name name, int dclass, long ttl, Name next, BitSet bitmap) {
super(name, Type.NXT, dclass, ttl);
this.next = checkName("next", next);
this.bitmap = bitmap;
}
void
rrFromWire(DNSInput in) throws IOException {
next = new Name(in);
bitmap = new BitSet();
int bitmapLength = in.remaining();
for (int i = 0; i < bitmapLength; i++) {
int t = in.readU8();
for (int j = 0; j < 8; j++)
if ((t & (1 << (7 - j))) != 0)
bitmap.set(i * 8 + j);
}
}
void
rdataFromString(Tokenizer st, Name origin) throws IOException {
next = st.getName(origin);
bitmap = new BitSet();
while (true) {
Tokenizer.Token t = st.get();
if (!t.isString())
break;
int typecode = Type.value(t.value, true);
if (typecode <= 0 || typecode > 128)
throw st.exception("Invalid type: " + t.value);
bitmap.set(typecode);
}
st.unget();
}
/** Converts rdata to a String */
String
rrToString() {
StringBuffer sb = new StringBuffer();
sb.append(next);
int length = bitmap.length();
for (short i = 0; i < length; i++)
if (bitmap.get(i)) {
sb.append(" ");
sb.append(Type.string(i));
}
return sb.toString();
}
/** Returns the next name */
public Name
getNext() {
return next;
}
/** Returns the set of types defined for this name */
public BitSet
getBitmap() {
return bitmap;
}
void
rrToWire(DNSOutput out, Compression c, boolean canonical) {
next.toWire(out, null, canonical);
int length = bitmap.length();
for (int i = 0, t = 0; i < length; i++) {
t |= (bitmap.get(i) ? (1 << (7 - i % 8)) : 0);
if (i % 8 == 7 || i == length - 1) {
out.writeU8(t);
t = 0;
}
}
}
}
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