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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.example.reverser;
    21
    22  import org.apache.mina.core.service.IoHandler;
    23  import org.apache.mina.core.service.IoHandlerAdapter;
    24  import org.apache.mina.core.session.IoSession;
    25
    26  /**
    27   * {@link IoHandler} implementation of reverser server protocol.
    28   *
    29   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    30   */
    31  public class ReverseProtocolHandler extends IoHandlerAdapter {
    32      @Override
    33      public void exceptionCaught(IoSession session, Throwable cause) {
    34          // Close connection when unexpected exception is caught.
    35          session.close(true);
    36      }
    37
    38      @Override
    39      public void messageReceived(IoSession session, Object message) {
    40          // Reverse reveiced string
    41          String str = message.toString();
    42          StringBuilder buf = new StringBuilder(str.length());
    43          for (int i = str.length() - 1; i >= 0; i--) {
    44              buf.append(str.charAt(i));
    45          }
    46
    47          // and write it back.
    48          session.write(buf.toString());
    49      }
    50  }