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