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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  import java.util.List;
21  
22  abstract class DefaultDnsServerAddresses extends DnsServerAddresses {
23  
24      protected final List<InetSocketAddress> addresses;
25      private final String strVal;
26  
27      DefaultDnsServerAddresses(String type, List<InetSocketAddress> addresses) {
28          this.addresses = addresses;
29  
30          final StringBuilder buf = new StringBuilder(type.length() + 2 + addresses.size() * 16);
31          buf.append(type).append('(');
32  
33          for (InetSocketAddress a: addresses) {
34              buf.append(a).append(", ");
35          }
36  
37          buf.setLength(buf.length() - 2);
38          buf.append(')');
39  
40          strVal = buf.toString();
41      }
42  
43      @Override
44      public String toString() {
45          return strVal;
46      }
47  }