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   /*
    * Copyright 2016 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.http2;
  
  import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.DefaultByteBufHolder;
  import io.netty.buffer.Unpooled;
  import io.netty.util.internal.StringUtil;
  import io.netty.util.internal.UnstableApi;
  
  /**
   * The default {@link Http2GoAwayFrame} implementation.
   */
  @UnstableApi
  public final class DefaultHttp2GoAwayFrame extends DefaultByteBufHolder implements Http2GoAwayFrame {
  
      private final long errorCode;
      private final int lastStreamId;
      private int extraStreamIds;
  
      /**
       * Equivalent to {@code new DefaultHttp2GoAwayFrame(error.code())}.
       *
       * @param error non-{@code null} reason for the go away
       */
      public DefaultHttp2GoAwayFrame(Http2Error error) {
          this(error.code());
      }
  
      /**
       * Equivalent to {@code new DefaultHttp2GoAwayFrame(content, Unpooled.EMPTY_BUFFER)}.
       *
       * @param errorCode reason for the go away
       */
      public DefaultHttp2GoAwayFrame(long errorCode) {
          this(errorCode, Unpooled.EMPTY_BUFFER);
      }
  
      /**
       *
       *
       * @param error non-{@code null} reason for the go away
       * @param content non-{@code null} debug data
       */
      public DefaultHttp2GoAwayFrame(Http2Error error, ByteBuf content) {
          this(error.code(), content);
      }
  
      /**
       * Construct a new GOAWAY message.
       *
       * @param errorCode reason for the go away
       * @param content non-{@code null} debug data
       */
      public DefaultHttp2GoAwayFrame(long errorCode, ByteBuf content) {
          this(-1, errorCode, content);
      }
  
      /**
       * Construct a new GOAWAY message.
       *
       * This constructor is for internal use only. A user should not have to specify a specific last stream identifier,
       * but use {@link #setExtraStreamIds(int)} instead.
       */
      DefaultHttp2GoAwayFrame(int lastStreamId, long errorCode, ByteBuf content) {
          super(content);
          this.errorCode = errorCode;
          this.lastStreamId = lastStreamId;
      }
  
      @Override
      public String name() {
          return "GOAWAY";
      }
  
      @Override
      public long errorCode() {
          return errorCode;
      }
  
      @Override
      public int extraStreamIds() {
          return extraStreamIds;
      }
 
     @Override
     public Http2GoAwayFrame setExtraStreamIds(int extraStreamIds) {
         checkPositiveOrZero(extraStreamIds, "extraStreamIds");
         this.extraStreamIds = extraStreamIds;
         return this;
     }
 
     @Override
     public int lastStreamId() {
         return lastStreamId;
     }
 
     @Override
     public Http2GoAwayFrame copy() {
         return new DefaultHttp2GoAwayFrame(lastStreamId, errorCode, content().copy());
     }
 
     @Override
     public Http2GoAwayFrame duplicate() {
         return (Http2GoAwayFrame) super.duplicate();
     }
 
     @Override
     public Http2GoAwayFrame retainedDuplicate() {
         return (Http2GoAwayFrame) super.retainedDuplicate();
     }
 
     @Override
     public Http2GoAwayFrame replace(ByteBuf content) {
         return new DefaultHttp2GoAwayFrame(errorCode, content).setExtraStreamIds(extraStreamIds);
     }
 
     @Override
     public Http2GoAwayFrame retain() {
         super.retain();
         return this;
     }
 
     @Override
     public Http2GoAwayFrame retain(int increment) {
         super.retain(increment);
         return this;
     }
 
     @Override
     public Http2GoAwayFrame touch() {
         super.touch();
         return this;
     }
 
     @Override
     public Http2GoAwayFrame touch(Object hint) {
         super.touch(hint);
         return this;
     }
 
     @Override
     public boolean equals(Object o) {
         if (!(o instanceof DefaultHttp2GoAwayFrame)) {
             return false;
         }
         DefaultHttp2GoAwayFrame other = (DefaultHttp2GoAwayFrame) o;
         return errorCode == other.errorCode && extraStreamIds == other.extraStreamIds && super.equals(other);
     }
 
     @Override
     public int hashCode() {
         int hash = super.hashCode();
         hash = hash * 31 + (int) (errorCode ^ errorCode >>> 32);
         hash = hash * 31 + extraStreamIds;
         return hash;
     }
 
     @Override
     public String toString() {
         return StringUtil.simpleClassName(this) + "(errorCode=" + errorCode + ", content=" + content()
                + ", extraStreamIds=" + extraStreamIds + ", lastStreamId=" + lastStreamId + ')';
     }
 }