📄 decodingstateprotocoldecoder.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><meta http-equiv="content-type" content="text/html; charset=UTF-8" /><title>DecodingStateProtocolDecoder xref</title><link type="text/css" rel="stylesheet" href="../../../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../../../apidocs/org/apache/mina/filter/codec/statemachine/DecodingStateProtocolDecoder.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="jxr_comment">/*</em><a name="2" href="#2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em><a name="3" href="#3">3</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em><a name="4" href="#4">4</a> <em class="jxr_comment"> * distributed with this work for additional information</em><a name="5" href="#5">5</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em><a name="6" href="#6">6</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em><a name="7" href="#7">7</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em><a name="8" href="#8">8</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em><a name="9" href="#9">9</a> <em class="jxr_comment"> *</em><a name="10" href="#10">10</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em><a name="11" href="#11">11</a> <em class="jxr_comment"> *</em><a name="12" href="#12">12</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em><a name="13" href="#13">13</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em><a name="14" href="#14">14</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em><a name="15" href="#15">15</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em><a name="16" href="#16">16</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em><a name="17" href="#17">17</a> <em class="jxr_comment"> * under the License.</em><a name="18" href="#18">18</a> <em class="jxr_comment"> *</em><a name="19" href="#19">19</a> <em class="jxr_comment"> */</em><a name="20" href="#20">20</a> <strong class="jxr_keyword">package</strong> org.apache.mina.filter.codec.statemachine;<a name="21" href="#21">21</a> <a name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.util.Queue;<a name="23" href="#23">23</a> <a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> org.apache.mina.common.IoBuffer;<a name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> org.apache.mina.common.IoSession;<a name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> org.apache.mina.filter.codec.ProtocolDecoder;<a name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.mina.filter.codec.ProtocolDecoderOutput;<a name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.mina.util.CircularQueue;<a name="29" href="#29">29</a> <a name="30" href="#30">30</a> <em class="jxr_javadoccomment">/**</em><a name="31" href="#31">31</a> <em class="jxr_javadoccomment"> * </em><a name="32" href="#32">32</a> <em class="jxr_javadoccomment"> * @author The Apache MINA Project (dev@mina.apache.org)</em><a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> * @version $Rev: 602854 $, $Date: 2007-12-10 03:43:18 -0700 (Mon, 10 Dec 2007) $</em><a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> */</em><a name="35" href="#35">35</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingStateProtocolDecoder.html">DecodingStateProtocolDecoder</a> implements <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoder.html">ProtocolDecoder</a> {<a name="36" href="#36">36</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingState.html">DecodingState</a> state;<a name="37" href="#37">37</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> Queue<IoBuffer> undecodedBuffers = <strong class="jxr_keyword">new</strong> CircularQueue<IoBuffer>();<a name="38" href="#38">38</a> <strong class="jxr_keyword">private</strong> <a href="../../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session;<a name="39" href="#39">39</a> <a name="40" href="#40">40</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingStateProtocolDecoder.html">DecodingStateProtocolDecoder</a>(<a href="../../../../../../org/apache/mina/filter/codec/statemachine/DecodingState.html">DecodingState</a> state) {<a name="41" href="#41">41</a> <strong class="jxr_keyword">if</strong> (state == <strong class="jxr_keyword">null</strong>) {<a name="42" href="#42">42</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"state"</span>);<a name="43" href="#43">43</a> }<a name="44" href="#44">44</a> <strong class="jxr_keyword">this</strong>.state = state;<a name="45" href="#45">45</a> }<a name="46" href="#46">46</a> <a name="47" href="#47">47</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> decode(<a href="../../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, <a href="../../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> in, <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html">ProtocolDecoderOutput</a> out)<a name="48" href="#48">48</a> <strong class="jxr_keyword">throws</strong> Exception {<a name="49" href="#49">49</a> <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.session == <strong class="jxr_keyword">null</strong>) {<a name="50" href="#50">50</a> <strong class="jxr_keyword">this</strong>.session = session;<a name="51" href="#51">51</a> } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (<strong class="jxr_keyword">this</strong>.session != session) {<a name="52" href="#52">52</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(<a name="53" href="#53">53</a> getClass().getSimpleName() + <span class="jxr_string">" is a stateful decoder. "</span> +<a name="54" href="#54">54</a> <span class="jxr_string">"You have to create one per session."</span>);<a name="55" href="#55">55</a> }<a name="56" href="#56">56</a> <a name="57" href="#57">57</a> undecodedBuffers.offer(in);<a name="58" href="#58">58</a> <strong class="jxr_keyword">for</strong> (;;) {<a name="59" href="#59">59</a> <a href="../../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> b = undecodedBuffers.peek();<a name="60" href="#60">60</a> <strong class="jxr_keyword">if</strong> (b == <strong class="jxr_keyword">null</strong>) {<a name="61" href="#61">61</a> <strong class="jxr_keyword">break</strong>;<a name="62" href="#62">62</a> }<a name="63" href="#63">63</a> <a name="64" href="#64">64</a> <strong class="jxr_keyword">int</strong> oldRemaining = b.remaining();<a name="65" href="#65">65</a> state.decode(b, out);<a name="66" href="#66">66</a> <strong class="jxr_keyword">int</strong> newRemaining = b.remaining();<a name="67" href="#67">67</a> <strong class="jxr_keyword">if</strong> (newRemaining != 0) {<a name="68" href="#68">68</a> <strong class="jxr_keyword">if</strong> (oldRemaining == newRemaining) {<a name="69" href="#69">69</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(<a name="70" href="#70">70</a> DecodingState.<strong class="jxr_keyword">class</strong>.getSimpleName() + <span class="jxr_string">" must "</span> +<a name="71" href="#71">71</a> <span class="jxr_string">"consume at least one byte per decode()."</span>);<a name="72" href="#72">72</a> }<a name="73" href="#73">73</a> <strong class="jxr_keyword">return</strong>;<a name="74" href="#74">74</a> } <strong class="jxr_keyword">else</strong> {<a name="75" href="#75">75</a> undecodedBuffers.poll();<a name="76" href="#76">76</a> }<a name="77" href="#77">77</a> }<a name="78" href="#78">78</a> }<a name="79" href="#79">79</a> <a name="80" href="#80">80</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> finishDecode(<a href="../../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html">ProtocolDecoderOutput</a> out)<a name="81" href="#81">81</a> <strong class="jxr_keyword">throws</strong> Exception {<a name="82" href="#82">82</a> state.finishDecode(out);<a name="83" href="#83">83</a> }<a name="84" href="#84">84</a> <a name="85" href="#85">85</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> dispose(<a href="../../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session) <strong class="jxr_keyword">throws</strong> Exception {}<a name="86" href="#86">86</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>⌨️ 快捷键说明
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