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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  }