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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.filter.codec.prefixedstring;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.apache.mina.core.buffer.BufferDataException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.mina.core.session.IoSession;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.mina.filter.codec.ProtocolCodecFactory;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.mina.filter.codec.ProtocolDecoder;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.mina.filter.codec.ProtocolEncoder;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.nio.charset.Charset;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>/**<a name="line.30"></a>
<span class="sourceLineNo">031</span> * A {@link ProtocolCodecFactory} that performs encoding and decoding<a name="line.31"></a>
<span class="sourceLineNo">032</span> * of a Java String object using a fixed-length length prefix.<a name="line.32"></a>
<span class="sourceLineNo">033</span> *<a name="line.33"></a>
<span class="sourceLineNo">034</span> * @author &lt;a href="http://mina.apache.org"&gt;Apache MINA Project&lt;/a&gt;<a name="line.34"></a>
<span class="sourceLineNo">035</span> */<a name="line.35"></a>
<span class="sourceLineNo">036</span>public class PrefixedStringCodecFactory implements ProtocolCodecFactory {<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span> private final PrefixedStringEncoder encoder;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span> private final PrefixedStringDecoder decoder;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span> public PrefixedStringCodecFactory(Charset charset) {<a name="line.42"></a>
<span class="sourceLineNo">043</span> encoder = new PrefixedStringEncoder(charset);<a name="line.43"></a>
<span class="sourceLineNo">044</span> decoder = new PrefixedStringDecoder(charset);<a name="line.44"></a>
<span class="sourceLineNo">045</span> }<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span> public PrefixedStringCodecFactory() {<a name="line.47"></a>
<span class="sourceLineNo">048</span> this(Charset.defaultCharset());<a name="line.48"></a>
<span class="sourceLineNo">049</span> }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> /**<a name="line.51"></a>
<span class="sourceLineNo">052</span> * Returns the allowed maximum size of an encoded string.<a name="line.52"></a>
<span class="sourceLineNo">053</span> * If the size of the encoded String exceeds this value, the encoder<a name="line.53"></a>
<span class="sourceLineNo">054</span> * will throw a {@link IllegalArgumentException}.<a name="line.54"></a>
<span class="sourceLineNo">055</span> * The default value is {@link PrefixedStringEncoder#DEFAULT_MAX_DATA_LENGTH}.<a name="line.55"></a>
<span class="sourceLineNo">056</span> * &lt;p&gt;<a name="line.56"></a>
<span class="sourceLineNo">057</span> * This method does the same job as {@link PrefixedStringEncoder#setMaxDataLength(int)}.<a name="line.57"></a>
<span class="sourceLineNo">058</span> *<a name="line.58"></a>
<span class="sourceLineNo">059</span> * @return the allowed maximum size of an encoded string.<a name="line.59"></a>
<span class="sourceLineNo">060</span> */<a name="line.60"></a>
<span class="sourceLineNo">061</span> public int getEncoderMaxDataLength() {<a name="line.61"></a>
<span class="sourceLineNo">062</span> return encoder.getMaxDataLength();<a name="line.62"></a>
<span class="sourceLineNo">063</span> }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span> /**<a name="line.65"></a>
<span class="sourceLineNo">066</span> * Sets the allowed maximum size of an encoded String.<a name="line.66"></a>
<span class="sourceLineNo">067</span> * If the size of the encoded String exceeds this value, the encoder<a name="line.67"></a>
<span class="sourceLineNo">068</span> * will throw a {@link IllegalArgumentException}.<a name="line.68"></a>
<span class="sourceLineNo">069</span> * The default value is {@link PrefixedStringEncoder#DEFAULT_MAX_DATA_LENGTH}.<a name="line.69"></a>
<span class="sourceLineNo">070</span> * &lt;p&gt;<a name="line.70"></a>
<span class="sourceLineNo">071</span> * This method does the same job as {@link PrefixedStringEncoder#getMaxDataLength()}.<a name="line.71"></a>
<span class="sourceLineNo">072</span> *<a name="line.72"></a>
<span class="sourceLineNo">073</span> * @param maxDataLength allowed maximum size of an encoded String.<a name="line.73"></a>
<span class="sourceLineNo">074</span> */<a name="line.74"></a>
<span class="sourceLineNo">075</span> public void setEncoderMaxDataLength(int maxDataLength) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> encoder.setMaxDataLength(maxDataLength);<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span> /**<a name="line.79"></a>
<span class="sourceLineNo">080</span> * @return the allowed maximum size of a decoded string.<a name="line.80"></a>
<span class="sourceLineNo">081</span> * &lt;p&gt;<a name="line.81"></a>
<span class="sourceLineNo">082</span> * This method does the same job as {@link PrefixedStringEncoder#setMaxDataLength(int)}.<a name="line.82"></a>
<span class="sourceLineNo">083</span> * @see #setDecoderMaxDataLength(int)<a name="line.83"></a>
<span class="sourceLineNo">084</span> */<a name="line.84"></a>
<span class="sourceLineNo">085</span> public int getDecoderMaxDataLength() {<a name="line.85"></a>
<span class="sourceLineNo">086</span> return decoder.getMaxDataLength();<a name="line.86"></a>
<span class="sourceLineNo">087</span> }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span> /**<a name="line.89"></a>
<span class="sourceLineNo">090</span> * Sets the maximum allowed value specified as data length in the decoded data<a name="line.90"></a>
<span class="sourceLineNo">091</span> * &lt;p&gt;<a name="line.91"></a>
<span class="sourceLineNo">092</span> * Useful for preventing an OutOfMemory attack by the peer.<a name="line.92"></a>
<span class="sourceLineNo">093</span> * The decoder will throw a {@link BufferDataException} when data length<a name="line.93"></a>
<span class="sourceLineNo">094</span> * specified in the incoming data is greater than maxDataLength<a name="line.94"></a>
<span class="sourceLineNo">095</span> * The default value is {@link PrefixedStringDecoder#DEFAULT_MAX_DATA_LENGTH}.<a name="line.95"></a>
<span class="sourceLineNo">096</span> * &lt;p&gt;<a name="line.96"></a>
<span class="sourceLineNo">097</span> * This method does the same job as {@link PrefixedStringDecoder#setMaxDataLength(int)}.<a name="line.97"></a>
<span class="sourceLineNo">098</span> *<a name="line.98"></a>
<span class="sourceLineNo">099</span> * @param maxDataLength maximum allowed value specified as data length in the incoming data<a name="line.99"></a>
<span class="sourceLineNo">100</span> */<a name="line.100"></a>
<span class="sourceLineNo">101</span> public void setDecoderMaxDataLength(int maxDataLength) {<a name="line.101"></a>
<span class="sourceLineNo">102</span> decoder.setMaxDataLength(maxDataLength);<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>
<span class="sourceLineNo">106</span> * Sets the length of the prefix used by the decoder<a name="line.106"></a>
<span class="sourceLineNo">107</span> *<a name="line.107"></a>
<span class="sourceLineNo">108</span> * @param prefixLength the length of the length prefix (1, 2, or 4)<a name="line.108"></a>
<span class="sourceLineNo">109</span> */<a name="line.109"></a>
<span class="sourceLineNo">110</span> public void setDecoderPrefixLength(int prefixLength) {<a name="line.110"></a>
<span class="sourceLineNo">111</span> decoder.setPrefixLength(prefixLength);<a name="line.111"></a>
<span class="sourceLineNo">112</span> }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span> /**<a name="line.114"></a>
<span class="sourceLineNo">115</span> * Gets the length of the length prefix (1, 2, or 4) used by the decoder<a name="line.115"></a>
<span class="sourceLineNo">116</span> *<a name="line.116"></a>
<span class="sourceLineNo">117</span> * @return length of the length prefix<a name="line.117"></a>
<span class="sourceLineNo">118</span> */<a name="line.118"></a>
<span class="sourceLineNo">119</span> public int getDecoderPrefixLength() {<a name="line.119"></a>
<span class="sourceLineNo">120</span> return decoder.getPrefixLength();<a name="line.120"></a>
<span class="sourceLineNo">121</span> }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span> /**<a name="line.123"></a>
<span class="sourceLineNo">124</span> * Sets the length of the prefix used by the encoder<a name="line.124"></a>
<span class="sourceLineNo">125</span> *<a name="line.125"></a>
<span class="sourceLineNo">126</span> * @param prefixLength the length of the length prefix (1, 2, or 4)<a name="line.126"></a>
<span class="sourceLineNo">127</span> */<a name="line.127"></a>
<span class="sourceLineNo">128</span> public void setEncoderPrefixLength(int prefixLength) {<a name="line.128"></a>
<span class="sourceLineNo">129</span> encoder.setPrefixLength(prefixLength);<a name="line.129"></a>
<span class="sourceLineNo">130</span> }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span> /**<a name="line.132"></a>
<span class="sourceLineNo">133</span> * Gets the length of the length prefix (1, 2, or 4) used by the encoder<a name="line.133"></a>
<span class="sourceLineNo">134</span> *<a name="line.134"></a>
<span class="sourceLineNo">135</span> * @return length of the length prefix<a name="line.135"></a>
<span class="sourceLineNo">136</span> */<a name="line.136"></a>
<span class="sourceLineNo">137</span> public int getEncoderPrefixLength() {<a name="line.137"></a>
<span class="sourceLineNo">138</span> return encoder.getPrefixLength();<a name="line.138"></a>
<span class="sourceLineNo">139</span> }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span> public ProtocolEncoder getEncoder(IoSession session) throws Exception {<a name="line.141"></a>
<span class="sourceLineNo">142</span> return encoder;<a name="line.142"></a>
<span class="sourceLineNo">143</span> }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span> public ProtocolDecoder getDecoder(IoSession session) throws Exception {<a name="line.145"></a>
<span class="sourceLineNo">146</span> return decoder;<a name="line.146"></a>
<span class="sourceLineNo">147</span> }<a name="line.147"></a>
<span class="sourceLineNo">148</span>}<a name="line.148"></a>
</pre>
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