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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  
17  package io.netty.resolver.dns;
18  
19  import java.net.InetSocketAddress;
20  
21  final class SingletonDnsServerAddresses extends DnsServerAddresses {
22  
23      private final InetSocketAddress address;
24  
25      private final DnsServerAddressStream stream = new DnsServerAddressStream() {
26          @Override
27          public InetSocketAddress next() {
28              return address;
29          }
30  
31          @Override
32          public int size() {
33              return 1;
34          }
35  
36          @Override
37          public DnsServerAddressStream duplicate() {
38              return this;
39          }
40  
41          @Override
42          public String toString() {
43              return SingletonDnsServerAddresses.this.toString();
44          }
45      };
46  
47      SingletonDnsServerAddresses(InetSocketAddress address) {
48          this.address = address;
49      }
50  
51      @Override
52      public DnsServerAddressStream stream() {
53          return stream;
54      }
55  
56      @Override
57      public String toString() {
58          return "singleton(" + address + ")";
59      }
60  }