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.mina;
  
  import org.apache.mina.core.service.IoHandler;
  import org.apache.mina.core.service.IoHandlerAdapter;
  import org.apache.mina.core.session.IoSession;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.apache.camel.test.junit5.TestSupport.isPlatform;
  
  /**
   * {@link IoHandler} implementation of reverser server protocol.
   *
   */
  public class MinaReverseProtocolHandler extends IoHandlerAdapter {
      private static final Logger LOG = LoggerFactory.getLogger(MinaReverseProtocolHandler.class);
  
      @Override
      public void exceptionCaught(IoSession session, Throwable cause) {
          LOG.warn("Unhandled exception: {}", cause.getMessage(), cause);
          // Close connection when unexpected exception is caught.
          session.closeNow();
      }
  
      @Override
      public void messageReceived(IoSession session, Object message) {
          // Reverse reveiced string
          String str = message.toString();
          StringBuilder buf = new StringBuilder(str.length());
          for (int i = str.length() - 1; i >= 0; i--) {
              buf.append(str.charAt(i));
          }
  
          if (isPlatform("windows")) {
              // seems to be only required on windows to make it work!
              buf.append(System.lineSeparator());
          }
  
          // and write it back.
          session.write(buf.toString());
      }
  }
  