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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.resolver.dns;
17  
18  import io.netty.handler.codec.dns.DnsQuestion;
19  import io.netty.util.internal.EmptyArrays;
20  import io.netty.util.internal.ObjectUtil;
21  import io.netty.util.internal.UnstableApi;
22  
23  import java.net.InetSocketAddress;
24  
25  /**
26   * A {@link RuntimeException} raised when {@link DnsNameResolver} failed to perform a successful query.
27   */
28  @UnstableApi
29  public class DnsNameResolverException extends RuntimeException {
30  
31      private static final long serialVersionUID = -8826717909627131850L;
32  
33      private final InetSocketAddress remoteAddress;
34      private final DnsQuestion question;
35  
36      public DnsNameResolverException(InetSocketAddress remoteAddress, DnsQuestion question, String message) {
37          super(message);
38          this.remoteAddress = validateRemoteAddress(remoteAddress);
39          this.question = validateQuestion(question);
40      }
41  
42      public DnsNameResolverException(
43              InetSocketAddress remoteAddress, DnsQuestion question, String message, Throwable cause) {
44          super(message, cause);
45          this.remoteAddress = validateRemoteAddress(remoteAddress);
46          this.question = validateQuestion(question);
47      }
48  
49      private static InetSocketAddress validateRemoteAddress(InetSocketAddress remoteAddress) {
50          return ObjectUtil.checkNotNull(remoteAddress, "remoteAddress");
51      }
52  
53      private static DnsQuestion validateQuestion(DnsQuestion question) {
54          return ObjectUtil.checkNotNull(question, "question");
55      }
56  
57      /**
58       * Returns the {@link InetSocketAddress} of the DNS query that has failed.
59       */
60      public InetSocketAddress remoteAddress() {
61          return remoteAddress;
62      }
63  
64      /**
65       * Returns the {@link DnsQuestion} of the DNS query that has failed.
66       */
67      public DnsQuestion question() {
68          return question;
69      }
70  
71      @Override
72      public Throwable fillInStackTrace() {
73          setStackTrace(EmptyArrays.EMPTY_STACK_TRACE);
74          return this;
75      }
76  }