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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 io.netty.util.internal.UnstableApi;
  
  /**
   * Abstract implementation of {@link Http2StreamFrame}.
   */
  @UnstableApi
  public abstract class AbstractHttp2StreamFrame implements Http2StreamFrame {
  
      private Http2FrameStream stream;
  
      @Override
      public AbstractHttp2StreamFrame stream(Http2FrameStream stream) {
          this.stream = stream;
          return this;
      }
  
      @Override
      public Http2FrameStream stream() {
          return stream;
      }
  
      /**
       * Returns {@code true} if {@code o} has equal {@code stream} to this object.
       */
      @Override
      public boolean equals(Object o) {
          if (!(o instanceof Http2StreamFrame)) {
              return false;
          }
          Http2StreamFrame other = (Http2StreamFrame) o;
          return stream == other.stream() || stream != null && stream.equals(other.stream());
      }
  
      @Override
      public int hashCode() {
          Http2FrameStream stream = this.stream;
          if (stream == null) {
              return super.hashCode();
          }
          return stream.hashCode();
      }
  }