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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.handler.codec.dns;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.util.internal.StringUtil;
  import io.netty.util.internal.UnstableApi;
  
  import static io.netty.util.internal.ObjectUtil.checkNotNull;
  
  /**
   * The default {@code DnsRawRecord} implementation.
   */
  @UnstableApi
  public class DefaultDnsRawRecord extends AbstractDnsRecord implements DnsRawRecord {
  
      private final ByteBuf content;
  
      /**
       * Creates a new {@link #CLASS_IN IN-class} record.
       *
       * @param name the domain name
       * @param type the type of the record
       * @param timeToLive the TTL value of the record
       */
      public DefaultDnsRawRecord(String name, DnsRecordType type, long timeToLive, ByteBuf content) {
          this(name, type, DnsRecord.CLASS_IN, timeToLive, content);
      }
  
      /**
       * Creates a new record.
       *
       * @param name the domain name
       * @param type the type of the record
       * @param dnsClass the class of the record, usually one of the following:
       *                 <ul>
       *                     <li>{@link #CLASS_IN}</li>
       *                     <li>{@link #CLASS_CSNET}</li>
       *                     <li>{@link #CLASS_CHAOS}</li>
       *                     <li>{@link #CLASS_HESIOD}</li>
       *                     <li>{@link #CLASS_NONE}</li>
       *                     <li>{@link #CLASS_ANY}</li>
       *                 </ul>
       * @param timeToLive the TTL value of the record
       */
      public DefaultDnsRawRecord(
              String name, DnsRecordType type, int dnsClass, long timeToLive, ByteBuf content) {
          super(name, type, dnsClass, timeToLive);
          this.content = checkNotNull(content, "content");
      }
  
      @Override
      public ByteBuf content() {
          return content;
      }
  
      @Override
      public DnsRawRecord copy() {
          return replace(content().copy());
      }
  
      @Override
      public DnsRawRecord duplicate() {
          return replace(content().duplicate());
      }
  
      @Override
      public DnsRawRecord retainedDuplicate() {
          return replace(content().retainedDuplicate());
      }
  
      @Override
      public DnsRawRecord replace(ByteBuf content) {
          return new DefaultDnsRawRecord(name(), type(), dnsClass(), timeToLive(), content);
      }
  
      @Override
      public int refCnt() {
          return content().refCnt();
      }
  
      @Override
      public DnsRawRecord retain() {
          content().retain();
          return this;
      }
 
     @Override
     public DnsRawRecord retain(int increment) {
         content().retain(increment);
         return this;
     }
 
     @Override
     public boolean release() {
         return content().release();
     }
 
     @Override
     public boolean release(int decrement) {
         return content().release(decrement);
     }
 
     @Override
     public DnsRawRecord touch() {
         content().touch();
         return this;
     }
 
     @Override
     public DnsRawRecord touch(Object hint) {
         content().touch(hint);
         return this;
     }
 
     @Override
     public String toString() {
         final StringBuilder buf = new StringBuilder(64).append(StringUtil.simpleClassName(this)).append('(');
         final DnsRecordType type = type();
         if (type != DnsRecordType.OPT) {
             buf.append(name().isEmpty()? "<root>" : name())
                .append(' ')
                .append(timeToLive())
                .append(' ');
 
             DnsMessageUtil.appendRecordClass(buf, dnsClass())
                           .append(' ')
                           .append(type.name());
         } else {
             buf.append("OPT flags:")
                .append(timeToLive())
                .append(" udp:")
                .append(dnsClass());
         }
 
         buf.append(' ')
            .append(content().readableBytes())
            .append("B)");
 
         return buf.toString();
     }
 }