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; 018 019/** 020 * @see <a href="http://tools.ietf.org/html/rfc2782">RFC 2782: A DNS RR for specifying the location of services (DNS 021 * SRV)</a> 022 * @author Florian Schmaus 023 * 024 */ 025public class SRVRecord extends HostAddress implements Comparable<SRVRecord> { 026 027 private int weight; 028 private int priority; 029 030 /** 031 * Create a new SRVRecord 032 * 033 * @param fqdn Fully qualified domain name 034 * @param port The connection port 035 * @param priority Priority of the target host 036 * @param weight Relative weight for records with same priority 037 * @throws IllegalArgumentException fqdn is null or any other field is not in valid range (0-65535). 038 */ 039 public SRVRecord(String fqdn, int port, int priority, int weight) { 040 super(fqdn, port); 041 if (weight < 0 || weight > 65535) 042 throw new IllegalArgumentException( 043 "DNS SRV records weight must be a 16-bit unsiged integer (i.e. between 0-65535. Weight was: " 044 + weight); 045 046 if (priority < 0 || priority > 65535) 047 throw new IllegalArgumentException( 048 "DNS SRV records priority must be a 16-bit unsiged integer (i.e. between 0-65535. Priority was: " 049 + priority); 050 051 this.priority = priority; 052 this.weight = weight; 053 054 } 055 056 public int getPriority() { 057 return priority; 058 } 059 060 public int getWeight() { 061 return weight; 062 } 063 064 @Override 065 public int compareTo(SRVRecord other) { 066 // According to RFC2782, 067 // "[a] client MUST attempt to contact the target host with the lowest-numbered priority it can reach". 068 // This means that a SRV record with a higher priority is 'less' then one with a lower. 069 int res = other.priority - this.priority; 070 if (res == 0) { 071 res = this.weight - other.weight; 072 } 073 return res; 074 } 075 076 @Override 077 public String toString() { 078 return super.toString() + " prio:" + priority + ":w:" + weight; 079 } 080}