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1   /*
2    * Copyright 2017 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.util.internal.ObjectUtil;
19  
20  /**
21   * A {@link DnsServerAddressStreamProvider} which is backed by a single {@link DnsServerAddresses}.
22   */
23  abstract class UniSequentialDnsServerAddressStreamProvider implements DnsServerAddressStreamProvider {
24      private final DnsServerAddresses addresses;
25  
26      UniSequentialDnsServerAddressStreamProvider(DnsServerAddresses addresses) {
27          this.addresses = ObjectUtil.checkNotNull(addresses, "addresses");
28      }
29  
30      @Override
31      public final DnsServerAddressStream nameServerAddressStream(String hostname) {
32          return addresses.stream();
33      }
34  }