textlinedecoder.html

MINA+API 关于MINA的API

<a name="113" href="#113">113</a> <em class="jxr_javadoccomment">     */</em>
<a name="114" href="#114">114</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> getMaxLineLength() {
<a name="115" href="#115">115</a>         <strong class="jxr_keyword">return</strong> maxLineLength;
<a name="116" href="#116">116</a>     }
<a name="117" href="#117">117</a> 
<a name="118" href="#118">118</a>     <em class="jxr_javadoccomment">/**</em>
<a name="119" href="#119">119</a> <em class="jxr_javadoccomment">     * Sets the allowed maximum size of the line to be decoded.</em>
<a name="120" href="#120">120</a> <em class="jxr_javadoccomment">     * If the size of the line to be decoded exceeds this value, the</em>
<a name="121" href="#121">121</a> <em class="jxr_javadoccomment">     * decoder will throw a {@link BufferDataException}.  The default</em>
<a name="122" href="#122">122</a> <em class="jxr_javadoccomment">     * value is &lt;tt&gt;1024&lt;/tt&gt; (1KB).</em>
<a name="123" href="#123">123</a> <em class="jxr_javadoccomment">     */</em>
<a name="124" href="#124">124</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setMaxLineLength(<strong class="jxr_keyword">int</strong> maxLineLength) {
<a name="125" href="#125">125</a>         <strong class="jxr_keyword">if</strong> (maxLineLength &lt;= 0) {
<a name="126" href="#126">126</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"maxLineLength: "</span>
<a name="127" href="#127">127</a>                     + maxLineLength);
<a name="128" href="#128">128</a>         }
<a name="129" href="#129">129</a> 
<a name="130" href="#130">130</a>         <strong class="jxr_keyword">this</strong>.maxLineLength = maxLineLength;
<a name="131" href="#131">131</a>     }
<a name="132" href="#132">132</a> 
<a name="133" href="#133">133</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 name="134" href="#134">134</a>             <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderOutput.html">ProtocolDecoderOutput</a> out) <strong class="jxr_keyword">throws</strong> Exception {
<a name="135" href="#135">135</a>         <a href="../../../../../../org/apache/mina/filter/codec/textline/TextLineDecoder.html">Context</a> ctx = getContext(session);
<a name="136" href="#136">136</a> 
<a name="137" href="#137">137</a>         <strong class="jxr_keyword">if</strong> (LineDelimiter.AUTO.equals(delimiter)) {
<a name="138" href="#138">138</a>             decodeAuto(ctx, in, out);
<a name="139" href="#139">139</a>         } <strong class="jxr_keyword">else</strong> {
<a name="140" href="#140">140</a>             decodeNormal(ctx, in, out);
<a name="141" href="#141">141</a>         }
<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">private</strong> <a href="../../../../../../org/apache/mina/filter/codec/textline/TextLineDecoder.html">Context</a> getContext(<a href="../../../../../../org/apache/mina/common/IoSession.html">IoSession</a> session) {
<a name="145" href="#145">145</a>         <a href="../../../../../../org/apache/mina/filter/codec/textline/TextLineDecoder.html">Context</a> ctx;
<a name="146" href="#146">146</a>         ctx = (Context) session.getAttribute(CONTEXT);
<a name="147" href="#147">147</a>         <strong class="jxr_keyword">if</strong> (ctx == <strong class="jxr_keyword">null</strong>) {
<a name="148" href="#148">148</a>             ctx = <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/mina/filter/codec/textline/TextLineDecoder.html">Context</a>();
<a name="149" href="#149">149</a>             session.setAttribute(CONTEXT, ctx);
<a name="150" href="#150">150</a>         }
<a name="151" href="#151">151</a>         <strong class="jxr_keyword">return</strong> ctx;
<a name="152" href="#152">152</a>     }
<a name="153" href="#153">153</a> 
<a name="154" href="#154">154</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="155" href="#155">155</a>             <strong class="jxr_keyword">throws</strong> Exception {
<a name="156" href="#156">156</a>     }
<a name="157" href="#157">157</a> 
<a name="158" href="#158">158</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="159" href="#159">159</a>         <a href="../../../../../../org/apache/mina/filter/codec/textline/TextLineDecoder.html">Context</a> ctx = (Context) session.getAttribute(CONTEXT);
<a name="160" href="#160">160</a>         <strong class="jxr_keyword">if</strong> (ctx != <strong class="jxr_keyword">null</strong>) {
<a name="161" href="#161">161</a>             session.removeAttribute(CONTEXT);
<a name="162" href="#162">162</a>         }
<a name="163" href="#163">163</a>     }
<a name="164" href="#164">164</a> 
<a name="165" href="#165">165</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> decodeAuto(<a href="../../../../../../org/apache/mina/filter/codec/textline/TextLineDecoder.html">Context</a> ctx, <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="166" href="#166">166</a>             <strong class="jxr_keyword">throws</strong> CharacterCodingException, <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderException.html">ProtocolDecoderException</a> {
<a name="167" href="#167">167</a> 
<a name="168" href="#168">168</a>         <strong class="jxr_keyword">int</strong> matchCount = ctx.getMatchCount();
<a name="169" href="#169">169</a> 
<a name="170" href="#170">170</a>         <em class="jxr_comment">// Try to find a match</em>
<a name="171" href="#171">171</a>         <strong class="jxr_keyword">int</strong> oldPos = in.position();
<a name="172" href="#172">172</a>         <strong class="jxr_keyword">int</strong> oldLimit = in.limit();
<a name="173" href="#173">173</a>         <strong class="jxr_keyword">while</strong> (in.hasRemaining()) {
<a name="174" href="#174">174</a>             byte b = in.get();
<a name="175" href="#175">175</a>             <strong class="jxr_keyword">boolean</strong> matched = false;
<a name="176" href="#176">176</a>             <strong class="jxr_keyword">switch</strong> (b) {
<a name="177" href="#177">177</a>             <strong class="jxr_keyword">case</strong> '\r':
<a name="178" href="#178">178</a>                 <em class="jxr_comment">// Might be Mac, but we don't auto-detect Mac EOL</em>
<a name="179" href="#179">179</a>                 <em class="jxr_comment">// to avoid confusion.</em>
<a name="180" href="#180">180</a>                 matchCount++;
<a name="181" href="#181">181</a>                 <strong class="jxr_keyword">break</strong>;
<a name="182" href="#182">182</a>             <strong class="jxr_keyword">case</strong> '\n':
<a name="183" href="#183">183</a>                 <em class="jxr_comment">// UNIX</em>
<a name="184" href="#184">184</a>                 matchCount++;
<a name="185" href="#185">185</a>                 matched = <strong class="jxr_keyword">true</strong>;
<a name="186" href="#186">186</a>                 <strong class="jxr_keyword">break</strong>;
<a name="187" href="#187">187</a>             <strong class="jxr_keyword">default</strong>:
<a name="188" href="#188">188</a>                 matchCount = 0;
<a name="189" href="#189">189</a>             }
<a name="190" href="#190">190</a> 
<a name="191" href="#191">191</a>             <strong class="jxr_keyword">if</strong> (matched) {
<a name="192" href="#192">192</a>                 <em class="jxr_comment">// Found a match.</em>
<a name="193" href="#193">193</a>                 <strong class="jxr_keyword">int</strong> pos = in.position();
<a name="194" href="#194">194</a>                 in.limit(pos);
<a name="195" href="#195">195</a>                 in.position(oldPos);
<a name="196" href="#196">196</a> 
<a name="197" href="#197">197</a>                 ctx.append(in);
<a name="198" href="#198">198</a> 
<a name="199" href="#199">199</a>                 in.limit(oldLimit);
<a name="200" href="#200">200</a>                 in.position(pos);
<a name="201" href="#201">201</a> 
<a name="202" href="#202">202</a>                 <strong class="jxr_keyword">if</strong> (ctx.getOverflowPosition() == 0) {
<a name="203" href="#203">203</a>                     <a href="../../../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> buf = ctx.getBuffer();
<a name="204" href="#204">204</a>                     buf.flip();
<a name="205" href="#205">205</a>                     buf.limit(buf.limit() - matchCount);
<a name="206" href="#206">206</a>                     <strong class="jxr_keyword">try</strong> {
<a name="207" href="#207">207</a>                         out.write(buf.getString(ctx.getDecoder()));
<a name="208" href="#208">208</a>                     } <strong class="jxr_keyword">finally</strong> {
<a name="209" href="#209">209</a>                         buf.clear();
<a name="210" href="#210">210</a>                     }
<a name="211" href="#211">211</a>                 } <strong class="jxr_keyword">else</strong> {
<a name="212" href="#212">212</a>                     <strong class="jxr_keyword">int</strong> overflowPosition = ctx.getOverflowPosition();
<a name="213" href="#213">213</a>                     ctx.reset();
<a name="214" href="#214">214</a>                     <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/apache/mina/filter/codec/RecoverableProtocolDecoderException.html">RecoverableProtocolDecoderException</a>(
<a name="215" href="#215">215</a>                             <span class="jxr_string">"Line is too long: "</span> + overflowPosition);
<a name="216" href="#216">216</a>                 }
<a name="217" href="#217">217</a> 
<a name="218" href="#218">218</a>                 oldPos = pos;
<a name="219" href="#219">219</a>                 matchCount = 0;
<a name="220" href="#220">220</a>             }
<a name="221" href="#221">221</a>         }
<a name="222" href="#222">222</a> 
<a name="223" href="#223">223</a>         <em class="jxr_comment">// Put remainder to buf.</em>
<a name="224" href="#224">224</a>         in.position(oldPos);
<a name="225" href="#225">225</a>         ctx.append(in);
<a name="226" href="#226">226</a> 
<a name="227" href="#227">227</a>         ctx.setMatchCount(matchCount);
<a name="228" href="#228">228</a>     }
<a name="229" href="#229">229</a> 
<a name="230" href="#230">230</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> decodeNormal(<a href="../../../../../../org/apache/mina/filter/codec/textline/TextLineDecoder.html">Context</a> ctx, <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="231" href="#231">231</a>             <strong class="jxr_keyword">throws</strong> CharacterCodingException, <a href="../../../../../../org/apache/mina/filter/codec/ProtocolDecoderException.html">ProtocolDecoderException</a> {
<a name="232" href="#232">232</a> 
<a name="233" href="#233">233</a>         <strong class="jxr_keyword">int</strong> matchCount = ctx.getMatchCount();
<a name="234" href="#234">234</a>