demuxingprotocoldecoder.html

MINA+API 关于MINA的API

<a name="87" href="#87">87</a>          }
<a name="88" href="#88">88</a>  
<a name="89" href="#89">89</a>          <strong class="jxr_keyword">try</strong> {
<a name="90" href="#90">90</a>              decoderClass.getConstructor(EMPTY_PARAMS);
<a name="91" href="#91">91</a>          } <strong class="jxr_keyword">catch</strong> (NoSuchMethodException e) {
<a name="92" href="#92">92</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a name="93" href="#93">93</a>                      <span class="jxr_string">"The specified class doesn't have a public default constructor."</span>);
<a name="94" href="#94">94</a>          }
<a name="95" href="#95">95</a>  
<a name="96" href="#96">96</a>          <strong class="jxr_keyword">boolean</strong> registered = false;
<a name="97" href="#97">97</a>          <strong class="jxr_keyword">if</strong> (MessageDecoder.<strong class="jxr_keyword">class</strong>.isAssignableFrom(decoderClass)) {
<a name="98" href="#98">98</a>              addMessageDecoder(<strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/mina/filter/codec/demux/DemuxingProtocolDecoder.html">DefaultConstructorMessageDecoderFactory</a>(decoderClass));
<a name="99" href="#99">99</a>              registered = <strong class="jxr_keyword">true</strong>;
<a name="100" href="#100">100</a>         }
<a name="101" href="#101">101</a> 
<a name="102" href="#102">102</a>         <strong class="jxr_keyword">if</strong> (!registered) {
<a name="103" href="#103">103</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a name="104" href="#104">104</a>                     <span class="jxr_string">"Unregisterable type: "</span> + decoderClass);
<a name="105" href="#105">105</a>         }
<a name="106" href="#106">106</a>     }
<a name="107" href="#107">107</a> 
<a name="108" href="#108">108</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addMessageDecoder(<a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoder.html">MessageDecoder</a> decoder) {
<a name="109" href="#109">109</a>         addMessageDecoder(<strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/mina/filter/codec/demux/DemuxingProtocolDecoder.html">SingletonMessageDecoderFactory</a>(decoder));
<a name="110" href="#110">110</a>     }
<a name="111" href="#111">111</a> 
<a name="112" href="#112">112</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addMessageDecoder(<a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoderFactory.html">MessageDecoderFactory</a> factory) {
<a name="113" href="#113">113</a>         <strong class="jxr_keyword">if</strong> (factory == <strong class="jxr_keyword">null</strong>) {
<a name="114" href="#114">114</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"factory"</span>);
<a name="115" href="#115">115</a>         }
<a name="116" href="#116">116</a>         <a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoderFactory.html">MessageDecoderFactory</a>[] decoderFactories = <strong class="jxr_keyword">this</strong>.decoderFactories;
<a name="117" href="#117">117</a>         <a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoderFactory.html">MessageDecoderFactory</a>[] newDecoderFactories = <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoderFactory.html">MessageDecoderFactory</a>[decoderFactories.length + 1];
<a name="118" href="#118">118</a>         System.arraycopy(decoderFactories, 0, newDecoderFactories, 0,
<a name="119" href="#119">119</a>                 decoderFactories.length);
<a name="120" href="#120">120</a>         newDecoderFactories[decoderFactories.length] = factory;
<a name="121" href="#121">121</a>         <strong class="jxr_keyword">this</strong>.decoderFactories = newDecoderFactories;
<a name="122" href="#122">122</a>     }
<a name="123" href="#123">123</a>     
<a name="124" href="#124">124</a>     @Override
<a name="125" href="#125">125</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> doDecode(<a href="../../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session, <a href="../../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> in,
<a name="126" href="#126">126</a>             <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html">ProtocolDecoderOutput</a> out) <strong class="jxr_keyword">throws</strong> Exception {
<a name="127" href="#127">127</a>         <a href="../../../../../../org/apache/mina/filter/codec/demux/DemuxingProtocolDecoder.html">State</a> state = getState(session);
<a name="128" href="#128">128</a>         <strong class="jxr_keyword">if</strong> (state.currentDecoder == <strong class="jxr_keyword">null</strong>) {
<a name="129" href="#129">129</a>             <a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoder.html">MessageDecoder</a>[] decoders = state.decoders;
<a name="130" href="#130">130</a>             <strong class="jxr_keyword">int</strong> undecodables = 0;
<a name="131" href="#131">131</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = decoders.length - 1; i &gt;= 0; i--) {
<a name="132" href="#132">132</a>                 <a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoder.html">MessageDecoder</a> decoder = decoders[i];
<a name="133" href="#133">133</a>                 <strong class="jxr_keyword">int</strong> limit = in.limit();
<a name="134" href="#134">134</a>                 <strong class="jxr_keyword">int</strong> pos = in.position();
<a name="135" href="#135">135</a> 
<a name="136" href="#136">136</a>                 <a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoderResult.html">MessageDecoderResult</a> result;
<a name="137" href="#137">137</a>                 <strong class="jxr_keyword">try</strong> {
<a name="138" href="#138">138</a>                     result = decoder.decodable(session, in);
<a name="139" href="#139">139</a>                 } <strong class="jxr_keyword">finally</strong> {
<a name="140" href="#140">140</a>                     in.position(pos);
<a name="141" href="#141">141</a>                     in.limit(limit);
<a name="142" href="#142">142</a>                 }
<a name="143" href="#143">143</a> 
<a name="144" href="#144">144</a>                 <strong class="jxr_keyword">if</strong> (result == MessageDecoder.OK) {
<a name="145" href="#145">145</a>                     state.currentDecoder = decoder;
<a name="146" href="#146">146</a>                     <strong class="jxr_keyword">break</strong>;
<a name="147" href="#147">147</a>                 } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (result == MessageDecoder.NOT_OK) {
<a name="148" href="#148">148</a>                     undecodables++;
<a name="149" href="#149">149</a>                 } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (result != MessageDecoder.NEED_DATA) {
<a name="150" href="#150">150</a>                     <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
<a name="151" href="#151">151</a>                             <span class="jxr_string">"Unexpected decode result (see your decodable()): "</span>
<a name="152" href="#152">152</a>                                     + result);
<a name="153" href="#153">153</a>                 }
<a name="154" href="#154">154</a>             }
<a name="155" href="#155">155</a> 
<a name="156" href="#156">156</a>             <strong class="jxr_keyword">if</strong> (undecodables == decoders.length) {
<a name="157" href="#157">157</a>                 <em class="jxr_comment">// Throw an exception if all decoders cannot decode data.</em>
<a name="158" href="#158">158</a>                 String dump = in.getHexDump();
<a name="159" href="#159">159</a>                 in.position(in.limit()); <em class="jxr_comment">// Skip data</em>
<a name="160" href="#160">160</a>                 <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderException.html">ProtocolDecoderException</a> e = <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderException.html">ProtocolDecoderException</a>(
<a name="161" href="#161">161</a>                         <span class="jxr_string">"No appropriate message decoder: "</span> + dump);
<a name="162" href="#162">162</a>                 e.setHexdump(dump);
<a name="163" href="#163">163</a>                 <strong class="jxr_keyword">throw</strong> e;
<a name="164" href="#164">164</a>             }
<a name="165" href="#165">165</a> 
<a name="166" href="#166">166</a>             <strong class="jxr_keyword">if</strong> (state.currentDecoder == <strong class="jxr_keyword">null</strong>) {
<a name="167" href="#167">167</a>                 <em class="jxr_comment">// Decoder is not determined yet (i.e. we need more data)</em>
<a name="168" href="#168">168</a>                 <strong class="jxr_keyword">return</strong> false;
<a name="169" href="#169">169</a>             }
<a name="170" href="#170">170</a>         }
<a name="171" href="#171">171</a> 
<a name="172" href="#172">172</a>         <a href="../../../../../../org/apache/mina/filter/codec/demux/MessageDecoderResult.html">MessageDecoderResult</a> result = state.currentDecoder.decode(session, in,
<a name="173" href="#173">173</a>                 out);
<a name="174" href="#174">174</a>         <strong class="jxr_keyword">if</strong> (result == MessageDecoder.OK) {
<a name="175" href="#175">175</a>             state.currentDecoder = <strong class="jxr_keyword">null</strong>;
<a name="176" href="#176">176</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="177" href="#177">177</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (result == MessageDecoder.NEED_DATA) {
<a name="178" href="#178">178</a>             <strong class="jxr_keyword">return</strong> false;
<a name="179" href="#179">179</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (result == MessageDecoder.NOT_OK) {
<a name="180" href="#180">180</a>             state.currentDecoder = <strong class="jxr_keyword">null</strong>;
<a name="181" href="#181">181</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderException.html">ProtocolDecoderException</a>(
<a name="182" href="#182">182</a>                     <span class="jxr_string">"Message decoder returned NOT_OK."</span>);