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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.StringUtil;
  import io.netty.util.internal.UnstableApi;
  
  import static io.netty.handler.codec.http2.Http2CodecUtil.verifyPadding;
  import static io.netty.util.internal.ObjectUtil.checkNotNull;
  
  /**
   * The default {@link Http2HeadersFrame} implementation.
   */
  @UnstableApi
  public final class DefaultHttp2HeadersFrame extends AbstractHttp2StreamFrame implements Http2HeadersFrame {
      private final Http2Headers headers;
      private final boolean endStream;
      private final int padding;
  
      /**
       * Equivalent to {@code new DefaultHttp2HeadersFrame(headers, false)}.
       *
       * @param headers the non-{@code null} headers to send
       */
      public DefaultHttp2HeadersFrame(Http2Headers headers) {
          this(headers, false);
      }
  
      /**
       * Equivalent to {@code new DefaultHttp2HeadersFrame(headers, endStream, 0)}.
       *
       * @param headers the non-{@code null} headers to send
       */
      public DefaultHttp2HeadersFrame(Http2Headers headers, boolean endStream) {
          this(headers, endStream, 0);
      }
  
      /**
       * Construct a new headers message.
       *
       * @param headers the non-{@code null} headers to send
       * @param endStream whether these headers should terminate the stream
       * @param padding additional bytes that should be added to obscure the true content size. Must be between 0 and
       *                256 (inclusive).
       */
      public DefaultHttp2HeadersFrame(Http2Headers headers, boolean endStream, int padding) {
          this.headers = checkNotNull(headers, "headers");
          this.endStream = endStream;
          verifyPadding(padding);
          this.padding = padding;
      }
  
      @Override
      public DefaultHttp2HeadersFrame stream(Http2FrameStream stream) {
          super.stream(stream);
          return this;
      }
  
      @Override
      public String name() {
          return "HEADERS";
      }
  
      @Override
      public Http2Headers headers() {
          return headers;
      }
  
      @Override
      public boolean isEndStream() {
          return endStream;
      }
  
      @Override
      public int padding() {
          return padding;
      }
  
      @Override
      public String toString() {
          return StringUtil.simpleClassName(this) + "(stream=" + stream() + ", headers=" + headers
                 + ", endStream=" + endStream + ", padding=" + padding + ')';
      }
  
      @Override
      public boolean equals(Object o) {
         if (!(o instanceof DefaultHttp2HeadersFrame)) {
             return false;
         }
         DefaultHttp2HeadersFrame other = (DefaultHttp2HeadersFrame) o;
         return super.equals(other) && headers.equals(other.headers)
                 && endStream == other.endStream && padding == other.padding;
     }
 
     @Override
     public int hashCode() {
         int hash = super.hashCode();
         hash = hash * 31 + headers.hashCode();
         hash = hash * 31 + (endStream ? 0 : 1);
         hash = hash * 31 + padding;
         return hash;
     }
 }