content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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
   *
   *      http://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 org.apache.camel.component.syslog.netty;
  
  import java.nio.charset.StandardCharsets;
  import java.util.List;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.ChannelHandler.Sharable;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.MessageToMessageEncoder;
  
  @Sharable
  public class Rfc5425Encoder extends MessageToMessageEncoder<ByteBuf> {
  
      @Override
      protected void encode(ChannelHandlerContext ctx, ByteBuf byteBuf, List<Object> out) throws Exception {
          if (byteBuf.isReadable()) {
              int length = byteBuf.readableBytes();
  
              String headerString = length + " ";
  
              ByteBuf header = ByteBufAllocator.DEFAULT.buffer(headerString.getBytes(StandardCharsets.UTF_8).length);
              header.writeBytes(headerString.getBytes(StandardCharsets.UTF_8));
  
              Unpooled.buffer();
  
              byteBuf.retain();
              out.add(Unpooled.wrappedBuffer(header, byteBuf));
          }
      }
  }
  