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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * software distributed under the License is distributed on an<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * KIND, either express or implied. See the License for the<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * specific language governing permissions and limitations<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> *<a name="line.18"></a> |
| <span class="sourceLineNo">019</span> */<a name="line.19"></a> |
| <span class="sourceLineNo">020</span>package org.apache.mina.example.tapedeck;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.nio.charset.Charset;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.LinkedList;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span><a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.mina.core.buffer.IoBuffer;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.mina.core.filterchain.IoFilter.NextFilter;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.mina.core.session.IoSession;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.mina.filter.codec.ProtocolDecoder;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.mina.filter.codec.ProtocolDecoderOutput;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.mina.filter.codec.textline.LineDelimiter;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.mina.filter.codec.textline.TextLineDecoder;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span><a name="line.32"></a> |
| <span class="sourceLineNo">033</span>/**<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * MINA {@link ProtocolDecoder} which decodes bytes into {@link Command}<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * objects.<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> *<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * @author <a href="http://mina.apache.org">Apache MINA Project</a><a name="line.37"></a> |
| <span class="sourceLineNo">038</span> */<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>public class CommandDecoder extends TextLineDecoder {<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> <a name="line.40"></a> |
| <span class="sourceLineNo">041</span> public CommandDecoder() {<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> super(Charset.forName("UTF8"), LineDelimiter.WINDOWS);<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> }<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> <a name="line.44"></a> |
| <span class="sourceLineNo">045</span> private Object parseCommand(String line) throws CommandSyntaxException {<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> String[] temp = line.split(" +", 2);<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> String cmd = temp[0].toLowerCase();<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> String arg = temp.length > 1 ? temp[1] : null;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> <a name="line.49"></a> |
| <span class="sourceLineNo">050</span> if (LoadCommand.NAME.equals(cmd)) {<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> if (arg == null) {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> throw new CommandSyntaxException("No tape number specified");<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> }<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> try {<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> return new LoadCommand(Integer.parseInt(arg));<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> } catch (NumberFormatException nfe) {<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> throw new CommandSyntaxException("Illegal tape number: " + arg);<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> }<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> } else if (PlayCommand.NAME.equals(cmd)) {<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> return new PlayCommand();<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> } else if (PauseCommand.NAME.equals(cmd)) {<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> return new PauseCommand();<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> } else if (StopCommand.NAME.equals(cmd)) {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> return new StopCommand();<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> } else if (ListCommand.NAME.equals(cmd)) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> return new ListCommand();<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> } else if (EjectCommand.NAME.equals(cmd)) {<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> return new EjectCommand();<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> } else if (QuitCommand.NAME.equals(cmd)) {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> return new QuitCommand();<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> } else if (InfoCommand.NAME.equals(cmd)) {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> return new InfoCommand();<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> } else if (UserCommand.NAME.equals(cmd)) {<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> if (arg == null) {<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> throw new CommandSyntaxException("No username specified");<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> }<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> return new UserCommand(arg);<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> } else if (PasswordCommand.NAME.equals(cmd)) {<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> if (arg == null) {<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> throw new CommandSyntaxException("No password specified");<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> }<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> return new PasswordCommand(arg);<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> <a name="line.84"></a> |
| <span class="sourceLineNo">085</span> throw new CommandSyntaxException("Unknown command: " + cmd);<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> }<a name="line.86"></a> |
| <span class="sourceLineNo">087</span><a name="line.87"></a> |
| <span class="sourceLineNo">088</span> @Override<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> public void decode(IoSession session, IoBuffer in, final ProtocolDecoderOutput out) <a name="line.89"></a> |
| <span class="sourceLineNo">090</span> throws Exception {<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> <a name="line.91"></a> |
| <span class="sourceLineNo">092</span> final LinkedList<String> lines = new LinkedList<String>();<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> super.decode(session, in, new ProtocolDecoderOutput() {<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> public void write(Object message) {<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> lines.add((String) message);<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> }<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> public void flush(NextFilter nextFilter, IoSession session) {}<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> });<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> <a name="line.99"></a> |
| <span class="sourceLineNo">100</span> for (String s: lines) {<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> out.write(parseCommand(s));<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> }<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> }<a name="line.103"></a> |
| <span class="sourceLineNo">104</span><a name="line.104"></a> |
| <span class="sourceLineNo">105</span>}<a name="line.105"></a> |
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