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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  package org.apache.mina.example.haiku;
    20
    21  import java.util.ArrayList;
    22  import java.util.List;
    23
    24  import org.apache.mina.core.filterchain.IoFilterAdapter;
    25  import org.apache.mina.core.session.IoSession;
    26
    27  /**
    28   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    29   */
    30  public class ToHaikuIoFilter extends IoFilterAdapter {
    31
    32      @SuppressWarnings( { "unchecked" })
    33      @Override
    34      public void messageReceived(NextFilter nextFilter, IoSession session,
    35              Object message) throws Exception {
    36          List<String> phrases = (List<String>) session.getAttribute("phrases");
    37
    38          if (null == phrases) {
    39              phrases = new ArrayList<String>();
    40              session.setAttribute("phrases", phrases);
    41          }
    42
    43          phrases.add((String) message);
    44
    45          if (phrases.size() == 3) {
    46              session.removeAttribute("phrases");
    47
    48              super.messageReceived(nextFilter, session, new Haiku(phrases
    49                      .toArray(new String[3])));
    50          }
    51      }
    52  }