1 /*
2 * Copyright 2016 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://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, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty5.handler.codec.dns;
17
18 import io.netty5.util.internal.StringUtil;
19 import io.netty5.util.internal.UnstableApi;
20
21 import static java.util.Objects.requireNonNull;
22
23 @UnstableApi
24 public class DefaultDnsPtrRecord extends AbstractDnsRecord implements DnsPtrRecord {
25
26 private final String hostname;
27
28 /**
29 * Creates a new PTR record.
30 *
31 * @param name the domain name
32 * @param dnsClass the class of the record, usually one of the following:
33 * <ul>
34 * <li>{@link #CLASS_IN}</li>
35 * <li>{@link #CLASS_CSNET}</li>
36 * <li>{@link #CLASS_CHAOS}</li>
37 * <li>{@link #CLASS_HESIOD}</li>
38 * <li>{@link #CLASS_NONE}</li>
39 * <li>{@link #CLASS_ANY}</li>
40 * </ul>
41 * @param timeToLive the TTL value of the record
42 * @param hostname the hostname this PTR record resolves to.
43 */
44 public DefaultDnsPtrRecord(
45 String name, int dnsClass, long timeToLive, String hostname) {
46 super(name, DnsRecordType.PTR, dnsClass, timeToLive);
47 this.hostname = requireNonNull(hostname, "hostname");
48 }
49
50 @Override
51 public String hostname() {
52 return hostname;
53 }
54
55 @Override
56 public String toString() {
57 final StringBuilder buf = new StringBuilder(64).append(StringUtil.simpleClassName(this)).append('(');
58 final DnsRecordType type = type();
59 buf.append(name().isEmpty()? "<root>" : name())
60 .append(' ')
61 .append(timeToLive())
62 .append(' ');
63
64 DnsMessageUtil.appendRecordClass(buf, dnsClass())
65 .append(' ')
66 .append(type.name());
67
68 buf.append(' ')
69 .append(hostname);
70
71 return buf.toString();
72 }
73
74 @Override
75 public DnsPtrRecord copy() {
76 return this;
77 }
78 }