/*
    * Copyright 2021 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.http3;
  
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelOutboundHandlerAdapter;
  import io.netty.channel.ChannelPromise;
  import io.netty.util.internal.ObjectUtil;
  
  import static io.netty.handler.codec.http3.Http3FrameValidationUtils.frameTypeUnexpected;
  import static io.netty.handler.codec.http3.Http3FrameValidationUtils.validateFrameWritten;
  
  class Http3FrameTypeOutboundValidationHandler<T extends Http3Frame> extends ChannelOutboundHandlerAdapter {
  
      private final Class<T> frameType;
  
      Http3FrameTypeOutboundValidationHandler(Class<T> frameType) {
          this.frameType = ObjectUtil.checkNotNull(frameType, "frameType");
      }
  
      @Override
      public final void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
          T frame = validateFrameWritten(frameType, msg);
          if (frame != null) {
              write(ctx, frame, promise);
          } else {
              writeFrameDiscarded(msg, promise);
          }
      }
  
      void write(ChannelHandlerContext ctx, T msg, ChannelPromise promise) {
          ctx.write(msg, promise);
      }
  
      void writeFrameDiscarded(Object discardedFrame, ChannelPromise promise) {
          frameTypeUnexpected(promise, discardedFrame);
      }
  }