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   /*
    * Copyright 2020 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;
  
  /**
   * Default implementation of {@link Http2PushPromiseFrame}
   */
  @UnstableApi
  public final class DefaultHttp2PushPromiseFrame implements Http2PushPromiseFrame {
  
      private Http2FrameStream pushStreamFrame;
      private final Http2Headers http2Headers;
      private Http2FrameStream streamFrame;
      private final int padding;
      private final int promisedStreamId;
  
      public DefaultHttp2PushPromiseFrame(Http2Headers http2Headers) {
          this(http2Headers, 0);
      }
  
      public DefaultHttp2PushPromiseFrame(Http2Headers http2Headers, int padding) {
          this(http2Headers, padding, -1);
      }
  
      DefaultHttp2PushPromiseFrame(Http2Headers http2Headers, int padding, int promisedStreamId) {
          this.http2Headers = http2Headers;
          this.padding = padding;
          this.promisedStreamId = promisedStreamId;
      }
  
      @Override
      public Http2StreamFrame pushStream(Http2FrameStream stream) {
          pushStreamFrame = stream;
          return this;
      }
  
      @Override
      public Http2FrameStream pushStream() {
          return pushStreamFrame;
      }
  
      @Override
      public Http2Headers http2Headers() {
          return http2Headers;
      }
  
      @Override
      public int padding() {
          return padding;
      }
  
      @Override
      public int promisedStreamId() {
          if (pushStreamFrame != null) {
              return pushStreamFrame.id();
          } else {
              return promisedStreamId;
          }
      }
  
      @Override
      public Http2PushPromiseFrame stream(Http2FrameStream stream) {
          streamFrame = stream;
          return this;
      }
  
      @Override
      public Http2FrameStream stream() {
          return streamFrame;
      }
  
      @Override
      public String name() {
          return "PUSH_PROMISE_FRAME";
      }
  
      @Override
      public String toString() {
          return "DefaultHttp2PushPromiseFrame{" +
                  "pushStreamFrame=" + pushStreamFrame +
                  ", http2Headers=" + http2Headers +
                  ", streamFrame=" + streamFrame +
                  ", padding=" + padding +
                  '}';
     }
 }