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}