1d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen/** 2d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * Copyright 2013 Florian Schmaus 3d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * 4d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); 5d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * you may not use this file except in compliance with the License. 6d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * You may obtain a copy of the License at 7d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * 8d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * http://www.apache.org/licenses/LICENSE-2.0 9d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * 10d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * Unless required by applicable law or agreed to in writing, software 11d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * distributed under the License is distributed on an "AS IS" BASIS, 12d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * See the License for the specific language governing permissions and 14d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * limitations under the License. 15d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen */ 16d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chenpackage org.jivesoftware.smack.util.dns; 17d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 18d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen/** 19d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * @see <a href="http://tools.ietf.org/html/rfc2782>RFC 2782: A DNS RR for specifying the location of services (DNS 20d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * SRV)<a> 21d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * @author Florian Schmaus 22d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * 23d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen */ 24d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chenpublic class SRVRecord extends HostAddress implements Comparable<SRVRecord> { 25d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 26d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen private int weight; 27d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen private int priority; 28d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 29d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen /** 30d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * Create a new SRVRecord 31d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * 32d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * @param fqdn Fully qualified domain name 33d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * @param port The connection port 34d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * @param priority Priority of the target host 35d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * @param weight Relative weight for records with same priority 36d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen * @throws IllegalArgumentException fqdn is null or any other field is not in valid range (0-65535). 37d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen */ 38d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen public SRVRecord(String fqdn, int port, int priority, int weight) { 39d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen super(fqdn, port); 40d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen if (weight < 0 || weight > 65535) 41d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen throw new IllegalArgumentException( 42d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen "DNS SRV records weight must be a 16-bit unsiged integer (i.e. between 0-65535. Weight was: " 43d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen + weight); 44d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 45d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen if (priority < 0 || priority > 65535) 46d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen throw new IllegalArgumentException( 47d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen "DNS SRV records priority must be a 16-bit unsiged integer (i.e. between 0-65535. Priority was: " 48d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen + priority); 49d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 50d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen this.priority = priority; 51d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen this.weight = weight; 52d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 53d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen } 54d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 55d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen public int getPriority() { 56d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen return priority; 57d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen } 58d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 59d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen public int getWeight() { 60d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen return weight; 61d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen } 62d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 63d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen @Override 64d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen public int compareTo(SRVRecord other) { 65d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen // According to RFC2782, 66d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen // "[a] client MUST attempt to contact the target host with the lowest-numbered priority it can reach". 67d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen // This means that a SRV record with a higher priority is 'less' then one with a lower. 68d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen int res = other.priority - this.priority; 69d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen if (res == 0) { 70d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen res = this.weight - other.weight; 71d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen } 72d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen return res; 73d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen } 74d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen 75d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen @Override 76d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen public String toString() { 77d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen return super.toString() + " prio:" + priority + ":w:" + weight; 78d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen } 79d7955ce24d294fb2014c59d11fca184471056f44Shuyi Chen} 80