/*
    * Copyright 2017 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;
  
  import static io.netty.util.internal.ObjectUtil.checkNotNull;
  
  /**
   * Builder for the {@link Http2FrameCodec}.
   */
  @UnstableApi
  public class Http2FrameCodecBuilder extends
          AbstractHttp2ConnectionHandlerBuilder<Http2FrameCodec, Http2FrameCodecBuilder> {
  
      private Http2FrameWriter frameWriter;
  
      /**
       * Allows overriding behavior of existing builder.
       * <p>
       * Users of this constructor are responsible for invoking {@link #server(boolean)} method or overriding
       * {@link #isServer()} method to give the builder information if the {@link Http2Connection}(s) it creates are in
       * server or client mode.
       *
       * @see AbstractHttp2ConnectionHandlerBuilder
       */
      protected Http2FrameCodecBuilder() {
      }
  
      Http2FrameCodecBuilder(boolean server) {
          server(server);
          // For backwards compatibility we should disable to timeout by default at this layer.
          gracefulShutdownTimeoutMillis(0);
      }
  
      /**
       * Creates a builder for an HTTP/2 client.
       */
      public static Http2FrameCodecBuilder forClient() {
          return new Http2FrameCodecBuilder(false);
      }
  
      /**
       * Creates a builder for an HTTP/2 server.
       */
      public static Http2FrameCodecBuilder forServer() {
          return new Http2FrameCodecBuilder(true);
      }
  
      // For testing only.
      Http2FrameCodecBuilder frameWriter(Http2FrameWriter frameWriter) {
          this.frameWriter = checkNotNull(frameWriter, "frameWriter");
          return this;
      }
  
      @Override
      public Http2Settings initialSettings() {
          return super.initialSettings();
      }
  
      @Override
      public Http2FrameCodecBuilder initialSettings(Http2Settings settings) {
          return super.initialSettings(settings);
      }
  
      @Override
      public long gracefulShutdownTimeoutMillis() {
          return super.gracefulShutdownTimeoutMillis();
      }
  
      @Override
      public Http2FrameCodecBuilder gracefulShutdownTimeoutMillis(long gracefulShutdownTimeoutMillis) {
          return super.gracefulShutdownTimeoutMillis(gracefulShutdownTimeoutMillis);
      }
  
      @Override
      public boolean isServer() {
          return super.isServer();
      }
  
      @Override
      public int maxReservedStreams() {
          return super.maxReservedStreams();
      }
  
     @Override
     public Http2FrameCodecBuilder maxReservedStreams(int maxReservedStreams) {
         return super.maxReservedStreams(maxReservedStreams);
     }
 
     @Override
     public boolean isValidateHeaders() {
         return super.isValidateHeaders();
     }
 
     @Override
     public Http2FrameCodecBuilder validateHeaders(boolean validateHeaders) {
         return super.validateHeaders(validateHeaders);
     }
 
     @Override
     public Http2FrameLogger frameLogger() {
         return super.frameLogger();
     }
 
     @Override
     public Http2FrameCodecBuilder frameLogger(Http2FrameLogger frameLogger) {
         return super.frameLogger(frameLogger);
     }
 
     @Override
     public boolean encoderEnforceMaxConcurrentStreams() {
         return super.encoderEnforceMaxConcurrentStreams();
     }
 
     @Override
     public Http2FrameCodecBuilder encoderEnforceMaxConcurrentStreams(boolean encoderEnforceMaxConcurrentStreams) {
         return super.encoderEnforceMaxConcurrentStreams(encoderEnforceMaxConcurrentStreams);
     }
 
     @Override
     public int encoderEnforceMaxQueuedControlFrames() {
         return super.encoderEnforceMaxQueuedControlFrames();
     }
 
     @Override
     public Http2FrameCodecBuilder encoderEnforceMaxQueuedControlFrames(int maxQueuedControlFrames) {
         return super.encoderEnforceMaxQueuedControlFrames(maxQueuedControlFrames);
     }
 
     @Override
     public Http2HeadersEncoder.SensitivityDetector headerSensitivityDetector() {
         return super.headerSensitivityDetector();
     }
 
     @Override
     public Http2FrameCodecBuilder headerSensitivityDetector(
             Http2HeadersEncoder.SensitivityDetector headerSensitivityDetector) {
         return super.headerSensitivityDetector(headerSensitivityDetector);
     }
 
     @Override
     public Http2FrameCodecBuilder encoderIgnoreMaxHeaderListSize(boolean ignoreMaxHeaderListSize) {
         return super.encoderIgnoreMaxHeaderListSize(ignoreMaxHeaderListSize);
     }
 
     @Override
     @Deprecated
     public Http2FrameCodecBuilder initialHuffmanDecodeCapacity(int initialHuffmanDecodeCapacity) {
         return super.initialHuffmanDecodeCapacity(initialHuffmanDecodeCapacity);
     }
 
     @Override
     public Http2FrameCodecBuilder autoAckSettingsFrame(boolean autoAckSettings) {
         return super.autoAckSettingsFrame(autoAckSettings);
     }
 
     @Override
     public Http2FrameCodecBuilder autoAckPingFrame(boolean autoAckPingFrame) {
         return super.autoAckPingFrame(autoAckPingFrame);
     }
 
     @Override
     public Http2FrameCodecBuilder decoupleCloseAndGoAway(boolean decoupleCloseAndGoAway) {
         return super.decoupleCloseAndGoAway(decoupleCloseAndGoAway);
     }
 
     @Override
     public Http2FrameCodecBuilder flushPreface(boolean flushPreface) {
         return super.flushPreface(flushPreface);
     }
 
     @Override
     public int decoderEnforceMaxConsecutiveEmptyDataFrames() {
         return super.decoderEnforceMaxConsecutiveEmptyDataFrames();
     }
 
     @Override
     public Http2FrameCodecBuilder decoderEnforceMaxConsecutiveEmptyDataFrames(int maxConsecutiveEmptyFrames) {
         return super.decoderEnforceMaxConsecutiveEmptyDataFrames(maxConsecutiveEmptyFrames);
     }
 
     @Override
     public Http2FrameCodecBuilder decoderEnforceMaxRstFramesPerWindow(
             int maxRstFramesPerWindow, int secondsPerWindow) {
         return super.decoderEnforceMaxRstFramesPerWindow(maxRstFramesPerWindow, secondsPerWindow);
     }
 
     /**
      * Build a {@link Http2FrameCodec} object.
      */
     @Override
     public Http2FrameCodec build() {
         Http2FrameWriter frameWriter = this.frameWriter;
         if (frameWriter != null) {
             // This is to support our tests and will never be executed by the user as frameWriter(...)
             // is package-private.
             DefaultHttp2Connection connection = new DefaultHttp2Connection(isServer(), maxReservedStreams());
             Long maxHeaderListSize = initialSettings().maxHeaderListSize();
             Http2FrameReader frameReader = new DefaultHttp2FrameReader(maxHeaderListSize == null ?
                     new DefaultHttp2HeadersDecoder(isValidateHeaders()) :
                     new DefaultHttp2HeadersDecoder(isValidateHeaders(), maxHeaderListSize));
 
             if (frameLogger() != null) {
                 frameWriter = new Http2OutboundFrameLogger(frameWriter, frameLogger());
                 frameReader = new Http2InboundFrameLogger(frameReader, frameLogger());
             }
             Http2ConnectionEncoder encoder = new DefaultHttp2ConnectionEncoder(connection, frameWriter);
             if (encoderEnforceMaxConcurrentStreams()) {
                 encoder = new StreamBufferingEncoder(encoder);
             }
             Http2ConnectionDecoder decoder = new DefaultHttp2ConnectionDecoder(connection, encoder, frameReader,
                     promisedRequestVerifier(), isAutoAckSettingsFrame(), isAutoAckPingFrame(), isValidateHeaders());
             int maxConsecutiveEmptyDataFrames = decoderEnforceMaxConsecutiveEmptyDataFrames();
             if (maxConsecutiveEmptyDataFrames > 0) {
                 decoder = new Http2EmptyDataFrameConnectionDecoder(decoder, maxConsecutiveEmptyDataFrames);
             }
             return build(decoder, encoder, initialSettings());
         }
         return super.build();
     }
 
     @Override
     protected Http2FrameCodec build(
             Http2ConnectionDecoder decoder, Http2ConnectionEncoder encoder, Http2Settings initialSettings) {
         Http2FrameCodec codec = new Http2FrameCodec(encoder, decoder, initialSettings,
                 decoupleCloseAndGoAway(), flushPreface());
         codec.gracefulShutdownTimeoutMillis(gracefulShutdownTimeoutMillis());
         return codec;
     }
 }