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   /*
    * Copyright 2015 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 java.net.InetSocketAddress;
  import java.util.List;
  
  abstract class DefaultDnsServerAddresses extends DnsServerAddresses {
  
      protected final List<InetSocketAddress> addresses;
      private final String strVal;
  
      DefaultDnsServerAddresses(String type, List<InetSocketAddress> addresses) {
          this.addresses = addresses;
  
          final StringBuilder buf = new StringBuilder(type.length() + 2 + addresses.size() * 16);
          buf.append(type).append('(');
  
          for (InetSocketAddress a: addresses) {
              buf.append(a).append(", ");
          }
  
          buf.setLength(buf.length() - 2);
          buf.append(')');
  
          strVal = buf.toString();
      }
  
      @Override
      public String toString() {
          return strVal;
      }
  }