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1   /*
2    * Copyright 2015 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    *   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, 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.netty.handler.codec.dns;
17  
18  import io.netty.util.internal.UnstableApi;
19  
20  /**
21   * A DNS resource record.
22   */
23  @UnstableApi
24  public interface DnsRecord {
25  
26      /**
27       * DNS resource record class: {@code IN}
28       */
29      int CLASS_IN = 0x0001;
30  
31      /**
32       * DNS resource record class: {@code CSNET}
33       */
34      int CLASS_CSNET = 0x0002;
35  
36      /**
37       * DNS resource record class: {@code CHAOS}
38       */
39      int CLASS_CHAOS = 0x0003;
40  
41      /**
42       * DNS resource record class: {@code HESIOD}
43       */
44      int CLASS_HESIOD = 0x0004;
45  
46      /**
47       * DNS resource record class: {@code NONE}
48       */
49      int CLASS_NONE = 0x00fe;
50  
51      /**
52       * DNS resource record class: {@code ANY}
53       */
54      int CLASS_ANY = 0x00ff;
55  
56      /**
57       * Returns the name of this resource record.
58       */
59      String name();
60  
61      /**
62       * Returns the type of this resource record.
63       */
64      DnsRecordType type();
65  
66      /**
67       * Returns the class of this resource record.
68       *
69       * @return the class value, usually one of the following:
70       *         <ul>
71       *             <li>{@link #CLASS_IN}</li>
72       *             <li>{@link #CLASS_CSNET}</li>
73       *             <li>{@link #CLASS_CHAOS}</li>
74       *             <li>{@link #CLASS_HESIOD}</li>
75       *             <li>{@link #CLASS_NONE}</li>
76       *             <li>{@link #CLASS_ANY}</li>
77       *         </ul>
78       */
79      int dnsClass();
80  
81      /**
82       * Returns the time to live after reading for this resource record.
83       */
84      long timeToLive();
85  }