001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.mina.example.haiku;
020
021import java.util.ArrayList;
022import java.util.List;
023
024import org.apache.mina.core.filterchain.IoFilterAdapter;
025import org.apache.mina.core.session.IoSession;
026
027/**
028 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
029 */
030public class ToHaikuIoFilter extends IoFilterAdapter {
031
032    @SuppressWarnings( { "unchecked" })
033    @Override
034    public void messageReceived(NextFilter nextFilter, IoSession session,
035            Object message) throws Exception {
036        List<String> phrases = (List<String>) session.getAttribute("phrases");
037
038        if (null == phrases) {
039            phrases = new ArrayList<String>();
040            session.setAttribute("phrases", phrases);
041        }
042
043        phrases.add((String) message);
044
045        if (phrases.size() == 3) {
046            session.removeAttribute("phrases");
047
048            super.messageReceived(nextFilter, session, new Haiku(phrases
049                    .toArray(new String[3])));
050        }
051    }
052}