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   /*
    * Copyright 2017 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.util.internal.ObjectUtil;
  
  /**
   * A {@link DnsServerAddressStreamProvider} which is backed by a single {@link DnsServerAddresses}.
   */
  abstract class UniSequentialDnsServerAddressStreamProvider implements DnsServerAddressStreamProvider {
      private final DnsServerAddresses addresses;
  
      UniSequentialDnsServerAddressStreamProvider(DnsServerAddresses addresses) {
          this.addresses = ObjectUtil.checkNotNull(addresses, "addresses");
      }
  
      @Override
      public final DnsServerAddressStream nameServerAddressStream(String hostname) {
          return addresses.stream();
      }
  }