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 * 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.netty.handler.codec.dns;
17
18 import io.netty.buffer.ByteBuf;
19
20 /**
21 * Decodes a DNS record into its object representation.
22 *
23 * @see DatagramDnsResponseDecoder
24 */
25 public interface DnsRecordDecoder {
26
27 DnsRecordDecoder DEFAULT = new DefaultDnsRecordDecoder();
28
29 /**
30 * Decodes a DNS question into its object representation.
31 *
32 * @param in the input buffer which contains a DNS question at its reader index
33 */
34 DnsQuestion decodeQuestion(ByteBuf in) throws Exception;
35
36 /**
37 * Decodes a DNS record into its object representation.
38 *
39 * @param in the input buffer which contains a DNS record at its reader index
40 *
41 * @return the decoded record, or {@code null} if there are not enough data in the input buffer
42 */
43 <T extends DnsRecord> T decodeRecord(ByteBuf in) throws Exception;
44 }