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   /*
    * Copyright 2015 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.resolver.dns;
  
  import io.netty.handler.codec.dns.DnsQuestion;
  import io.netty.util.internal.EmptyArrays;
  import io.netty.util.internal.ObjectUtil;
  
  import java.net.InetSocketAddress;
  
  /**
   * A {@link RuntimeException} raised when {@link DnsNameResolver} failed to perform a successful query.
   */
  public class DnsNameResolverException extends RuntimeException {
  
      private static final long serialVersionUID = -8826717909627131850L;
  
      private final InetSocketAddress remoteAddress;
      private final DnsQuestion question;
  
      public DnsNameResolverException(InetSocketAddress remoteAddress, DnsQuestion question, String message) {
          super(message);
          this.remoteAddress = validateRemoteAddress(remoteAddress);
          this.question = validateQuestion(question);
      }
  
      public DnsNameResolverException(
              InetSocketAddress remoteAddress, DnsQuestion question, String message, Throwable cause) {
          super(message, cause);
          this.remoteAddress = validateRemoteAddress(remoteAddress);
          this.question = validateQuestion(question);
      }
  
      private static InetSocketAddress validateRemoteAddress(InetSocketAddress remoteAddress) {
          return ObjectUtil.checkNotNull(remoteAddress, "remoteAddress");
      }
  
      private static DnsQuestion validateQuestion(DnsQuestion question) {
          return ObjectUtil.checkNotNull(question, "question");
      }
  
      /**
       * Returns the {@link InetSocketAddress} of the DNS query that has failed.
       */
      public InetSocketAddress remoteAddress() {
          return remoteAddress;
      }
  
      /**
       * Returns the {@link DnsQuestion} of the DNS query that has failed.
       */
      public DnsQuestion question() {
          return question;
      }
  
      // Suppress a warning since the method doesn't need synchronization
      @Override
      public Throwable fillInStackTrace() {
          setStackTrace(EmptyArrays.EMPTY_STACK_TRACE);
          return this;
      }
  }