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   /*
    * Copyright 2020 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;
  
  /**
   * Represents options defined in a file of the format <a href=https://linux.die.net/man/5/resolver>etc/resolv.conf</a>.
   */
  final class UnixResolverOptions {
  
      private final int ndots;
      private final int timeout;
      private final int attempts;
  
      UnixResolverOptions(int ndots, int timeout, int attempts) {
          this.ndots = ndots;
          this.timeout = timeout;
          this.attempts = attempts;
      }
  
      static UnixResolverOptions.Builder newBuilder() {
          return new UnixResolverOptions.Builder();
      }
  
      /**
       * The number of dots which must appear in a name before an initial absolute query is made.
       * The default value is {@code 1}.
       */
      int ndots() {
          return ndots;
      }
  
      /**
       * The timeout of each DNS query performed by this resolver (in seconds).
       * The default value is {@code 5}.
       */
      int timeout() {
          return timeout;
      }
  
      /**
       * The maximum allowed number of DNS queries to send when resolving a host name.
       * The default value is {@code 16}.
       */
      int attempts() {
          return attempts;
      }
  
      @Override
      public String toString() {
          return getClass().getSimpleName() +
                  "{ndots=" + ndots +
                  ", timeout=" + timeout +
                  ", attempts=" + attempts +
                  '}';
      }
  
      static final class Builder {
  
          private int ndots = 1;
          private int timeout = 5;
          private int attempts = 16;
  
          private Builder() {
          }
  
          void setNdots(int ndots) {
              this.ndots = ndots;
          }
  
          void setTimeout(int timeout) {
              this.timeout = timeout;
          }
  
          void setAttempts(int attempts) {
              this.attempts = attempts;
          }
  
          UnixResolverOptions build() {
              return new UnixResolverOptions(ndots, timeout, attempts);
          }
      }
  }