/**
* Copyright 2013 Florian Schmaus
*
* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smack.util.dns;
import java.util.ArrayList;
import java.util.List;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.Record;
import org.xbill.DNS.Type;
/**
* This implementation uses the <a href="http://www.dnsjava.org/">dnsjava</a> implementation for resolving DNS addresses.
*
*/
public class DNSJavaResolver implements DNSResolver {
private static DNSJavaResolver instance = new DNSJavaResolver();
private DNSJavaResolver() {
}
public static DNSResolver getInstance() {
return instance;
}
@Override
public List<SRVRecord> lookupSRVRecords(String name) {
List<SRVRecord> res = new ArrayList<SRVRecord>();
try {
Lookup lookup = new Lookup(name, Type.SRV);
Record recs[] = lookup.run();
if (recs == null)
return res;
for (Record record : recs) {
org.xbill.DNS.SRVRecord srvRecord = (org.xbill.DNS.SRVRecord) record;
if (srvRecord != null && srvRecord.getTarget() != null) {
String host = srvRecord.getTarget().toString();
int port = srvRecord.getPort();
int priority = srvRecord.getPriority();
int weight = srvRecord.getWeight();
SRVRecord r;
try {
r = new SRVRecord(host, port, priority, weight);
} catch (Exception e) {
continue;
}
res.add(r);
}
}
} catch (Exception e) {
}
return res;
}
}