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   /*
    * Copyright 2011 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.channel.sctp;
  
  import com.sun.nio.sctp.SctpChannel;
  import com.sun.nio.sctp.SctpStandardSocketOptions;
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.channel.ChannelException;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.DefaultChannelConfig;
  import io.netty.channel.MessageSizeEstimator;
  import io.netty.channel.RecvByteBufAllocator;
  import io.netty.channel.WriteBufferWaterMark;
  import io.netty.util.internal.ObjectUtil;
  import io.netty.util.internal.PlatformDependent;
  
  import java.io.IOException;
  import java.util.Map;
  
  import static io.netty.channel.ChannelOption.SO_RCVBUF;
  import static io.netty.channel.ChannelOption.SO_SNDBUF;
  import static io.netty.channel.sctp.SctpChannelOption.SCTP_INIT_MAXSTREAMS;
  import static io.netty.channel.sctp.SctpChannelOption.SCTP_NODELAY;
  
  /**
   * The default {@link SctpChannelConfig} implementation for SCTP.
   */
  public class DefaultSctpChannelConfig extends DefaultChannelConfig implements SctpChannelConfig {
  
      private final SctpChannel javaChannel;
  
      public DefaultSctpChannelConfig(io.netty.channel.sctp.SctpChannel channel, SctpChannel javaChannel) {
          super(channel);
          this.javaChannel = ObjectUtil.checkNotNull(javaChannel, "javaChannel");
  
          // Enable TCP_NODELAY by default if possible.
          if (PlatformDependent.canEnableTcpNoDelayByDefault()) {
              try {
                  setSctpNoDelay(true);
              } catch (Exception e) {
                  // Ignore.
              }
          }
      }
  
      @Override
      public Map<ChannelOption<?>, Object> getOptions() {
          return getOptions(
                  super.getOptions(),
                  SO_RCVBUF, SO_SNDBUF, SCTP_NODELAY, SCTP_INIT_MAXSTREAMS);
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public <T> T getOption(ChannelOption<T> option) {
          if (option == SO_RCVBUF) {
              return (T) Integer.valueOf(getReceiveBufferSize());
          }
          if (option == SO_SNDBUF) {
              return (T) Integer.valueOf(getSendBufferSize());
          }
          if (option == SCTP_NODELAY) {
              return (T) Boolean.valueOf(isSctpNoDelay());
          }
          if (option == SCTP_INIT_MAXSTREAMS) {
              return (T) getInitMaxStreams();
          }
          return super.getOption(option);
      }
  
      @Override
      public <T> boolean setOption(ChannelOption<T> option, T value) {
          validate(option, value);
  
          if (option == SO_RCVBUF) {
              setReceiveBufferSize((Integer) value);
          } else if (option == SO_SNDBUF) {
              setSendBufferSize((Integer) value);
          } else if (option == SCTP_NODELAY) {
              setSctpNoDelay((Boolean) value);
          } else if (option == SCTP_INIT_MAXSTREAMS) {
              setInitMaxStreams((SctpStandardSocketOptions.InitMaxStreams) value);
          } else {
              return super.setOption(option, value);
          }
  
         return true;
     }
 
     @Override
     public boolean isSctpNoDelay() {
         try {
             return javaChannel.getOption(SctpStandardSocketOptions.SCTP_NODELAY);
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public SctpChannelConfig setSctpNoDelay(boolean sctpNoDelay) {
         try {
             javaChannel.setOption(SctpStandardSocketOptions.SCTP_NODELAY, sctpNoDelay);
         } catch (IOException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public int getSendBufferSize() {
         try {
             return javaChannel.getOption(SctpStandardSocketOptions.SO_SNDBUF);
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public SctpChannelConfig setSendBufferSize(int sendBufferSize) {
         try {
             javaChannel.setOption(SctpStandardSocketOptions.SO_SNDBUF, sendBufferSize);
         } catch (IOException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public int getReceiveBufferSize() {
         try {
             return javaChannel.getOption(SctpStandardSocketOptions.SO_RCVBUF);
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public SctpChannelConfig setReceiveBufferSize(int receiveBufferSize) {
         try {
             javaChannel.setOption(SctpStandardSocketOptions.SO_RCVBUF, receiveBufferSize);
         } catch (IOException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public SctpStandardSocketOptions.InitMaxStreams getInitMaxStreams() {
         try {
             return javaChannel.getOption(SctpStandardSocketOptions.SCTP_INIT_MAXSTREAMS);
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public SctpChannelConfig setInitMaxStreams(SctpStandardSocketOptions.InitMaxStreams initMaxStreams) {
         try {
             javaChannel.setOption(SctpStandardSocketOptions.SCTP_INIT_MAXSTREAMS, initMaxStreams);
         } catch (IOException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public SctpChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis) {
         super.setConnectTimeoutMillis(connectTimeoutMillis);
         return this;
     }
 
     @Override
     @Deprecated
     public SctpChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead) {
         super.setMaxMessagesPerRead(maxMessagesPerRead);
         return this;
     }
 
     @Override
     public SctpChannelConfig setWriteSpinCount(int writeSpinCount) {
         super.setWriteSpinCount(writeSpinCount);
         return this;
     }
 
     @Override
     public SctpChannelConfig setAllocator(ByteBufAllocator allocator) {
         super.setAllocator(allocator);
         return this;
     }
 
     @Override
     public SctpChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator) {
         super.setRecvByteBufAllocator(allocator);
         return this;
     }
 
     @Override
     public SctpChannelConfig setAutoRead(boolean autoRead) {
         super.setAutoRead(autoRead);
         return this;
     }
 
     @Override
     public SctpChannelConfig setAutoClose(boolean autoClose) {
         super.setAutoClose(autoClose);
         return this;
     }
 
     @Override
     public SctpChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
         super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
         return this;
     }
 
     @Override
     public SctpChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
         super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
         return this;
     }
 
     @Override
     public SctpChannelConfig setWriteBufferWaterMark(WriteBufferWaterMark writeBufferWaterMark) {
         super.setWriteBufferWaterMark(writeBufferWaterMark);
         return this;
     }
 
     @Override
     public SctpChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
         super.setMessageSizeEstimator(estimator);
         return this;
     }
 }