001/** 002 * 003 * Copyright 2013-2014 Florian Schmaus 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.jivesoftware.smack.util.dns.dnsjava; 018 019import java.util.ArrayList; 020import java.util.List; 021 022import org.jivesoftware.smack.util.dns.DNSResolver; 023import org.jivesoftware.smack.util.dns.SRVRecord; 024import org.xbill.DNS.Lookup; 025import org.xbill.DNS.Record; 026import org.xbill.DNS.TextParseException; 027import org.xbill.DNS.Type; 028 029/** 030 * This implementation uses the <a href="http://www.dnsjava.org/">dnsjava</a> implementation for resolving DNS addresses. 031 * 032 */ 033public class DNSJavaResolver implements DNSResolver { 034 035 private static DNSJavaResolver instance = new DNSJavaResolver(); 036 037 private DNSJavaResolver() { 038 } 039 040 public static DNSResolver getInstance() { 041 return instance; 042 } 043 044 @Override 045 public List<SRVRecord> lookupSRVRecords(String name) throws TextParseException { 046 List<SRVRecord> res = new ArrayList<SRVRecord>(); 047 048 Lookup lookup = new Lookup(name, Type.SRV); 049 Record recs[] = lookup.run(); 050 if (recs == null) 051 return res; 052 053 for (Record record : recs) { 054 org.xbill.DNS.SRVRecord srvRecord = (org.xbill.DNS.SRVRecord) record; 055 if (srvRecord != null && srvRecord.getTarget() != null) { 056 String host = srvRecord.getTarget().toString(); 057 int port = srvRecord.getPort(); 058 int priority = srvRecord.getPriority(); 059 int weight = srvRecord.getWeight(); 060 061 SRVRecord r = new SRVRecord(host, port, priority, weight); 062 res.add(r); 063 } 064 } 065 066 return res; 067 } 068}