86 lines
2.7 KiB
Java
86 lines
2.7 KiB
Java
/**
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*
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* Copyright 2013-2016 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util.dns;
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import java.net.InetAddress;
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import java.util.List;
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/**
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* A DNS SRV RR.
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*
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* @see <a href="http://tools.ietf.org/html/rfc2782">RFC 2782: A DNS RR for specifying the location of services (DNS
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* SRV)</a>
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* @author Florian Schmaus
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*
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*/
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public class SRVRecord extends HostAddress implements Comparable<SRVRecord> {
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private int weight;
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private int priority;
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/**
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* SRV Record constructor.
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*
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* @param fqdn Fully qualified domain name
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* @param port The connection port
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* @param priority Priority of the target host
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* @param weight Relative weight for records with same priority
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* @throws IllegalArgumentException fqdn is null or any other field is not in valid range (0-65535).
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*/
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public SRVRecord(String fqdn, int port, int priority, int weight, List<InetAddress> inetAddresses) {
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super(fqdn, port, inetAddresses);
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if (weight < 0 || weight > 65535)
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throw new IllegalArgumentException(
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"DNS SRV records weight must be a 16-bit unsiged integer (i.e. between 0-65535. Weight was: "
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+ weight);
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if (priority < 0 || priority > 65535)
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throw new IllegalArgumentException(
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"DNS SRV records priority must be a 16-bit unsiged integer (i.e. between 0-65535. Priority was: "
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+ priority);
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this.priority = priority;
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this.weight = weight;
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}
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public int getPriority() {
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return priority;
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}
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public int getWeight() {
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return weight;
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}
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@Override
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public int compareTo(SRVRecord other) {
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// According to RFC2782,
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// "[a] client MUST attempt to contact the target host with the lowest-numbered priority it can reach".
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// This means that a SRV record with a higher priority is 'less' then one with a lower.
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int res = other.priority - this.priority;
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if (res == 0) {
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res = this.weight - other.weight;
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}
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return res;
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}
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@Override
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public String toString() {
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return super.toString() + " prio:" + priority + ":w:" + weight;
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}
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}
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