abstractiobuffer.html

MINA+API 关于MINA的API

<a name="137" href="#137">137</a>         <strong class="jxr_keyword">if</strong> (newCapacity &gt; capacity()) {
<a name="138" href="#138">138</a>             <em class="jxr_comment">// Expand:</em>
<a name="139" href="#139">139</a>             <em class="jxr_comment">//// Save the state.</em>
<a name="140" href="#140">140</a>             <strong class="jxr_keyword">int</strong> pos = position();
<a name="141" href="#141">141</a>             <strong class="jxr_keyword">int</strong> limit = limit();
<a name="142" href="#142">142</a>             ByteOrder bo = order();
<a name="143" href="#143">143</a> 
<a name="144" href="#144">144</a>             <em class="jxr_comment">//// Reallocate.</em>
<a name="145" href="#145">145</a>             ByteBuffer oldBuf = buf();
<a name="146" href="#146">146</a>             ByteBuffer newBuf = 
<a name="147" href="#147">147</a>                 allocator.allocateNioBuffer(newCapacity, isDirect());
<a name="148" href="#148">148</a>             oldBuf.clear();
<a name="149" href="#149">149</a>             newBuf.put(oldBuf);
<a name="150" href="#150">150</a>             buf(newBuf);
<a name="151" href="#151">151</a> 
<a name="152" href="#152">152</a>             <em class="jxr_comment">//// Restore the state.</em>
<a name="153" href="#153">153</a>             buf().limit(limit);
<a name="154" href="#154">154</a>             <strong class="jxr_keyword">if</strong> (mark &gt;= 0) {
<a name="155" href="#155">155</a>                 buf().position(mark);
<a name="156" href="#156">156</a>                 buf().mark();
<a name="157" href="#157">157</a>             }
<a name="158" href="#158">158</a>             buf().position(pos);
<a name="159" href="#159">159</a>             buf().order(bo);
<a name="160" href="#160">160</a>         }
<a name="161" href="#161">161</a>         
<a name="162" href="#162">162</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="163" href="#163">163</a>     }
<a name="164" href="#164">164</a> 
<a name="165" href="#165">165</a>     @Override
<a name="166" href="#166">166</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">boolean</strong> isAutoExpand() {
<a name="167" href="#167">167</a>         <strong class="jxr_keyword">return</strong> autoExpand &amp;&amp; recapacityAllowed;
<a name="168" href="#168">168</a>     }
<a name="169" href="#169">169</a>     
<a name="170" href="#170">170</a>     @Override
<a name="171" href="#171">171</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">boolean</strong> isAutoShrink() {
<a name="172" href="#172">172</a>         <strong class="jxr_keyword">return</strong> autoShrink &amp;&amp; recapacityAllowed;
<a name="173" href="#173">173</a>     }
<a name="174" href="#174">174</a>     
<a name="175" href="#175">175</a>     @Override
<a name="176" href="#176">176</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">boolean</strong> isDerived() {
<a name="177" href="#177">177</a>         <strong class="jxr_keyword">return</strong> derived;
<a name="178" href="#178">178</a>     }
<a name="179" href="#179">179</a> 
<a name="180" href="#180">180</a>     @Override
<a name="181" href="#181">181</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> setAutoExpand(<strong class="jxr_keyword">boolean</strong> autoExpand) {
<a name="182" href="#182">182</a>         <strong class="jxr_keyword">if</strong> (!recapacityAllowed) {
<a name="183" href="#183">183</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
<a name="184" href="#184">184</a>                     <span class="jxr_string">"Derived buffers and their parent can't be expanded."</span>);
<a name="185" href="#185">185</a>         }
<a name="186" href="#186">186</a>         <strong class="jxr_keyword">this</strong>.autoExpand = autoExpand;
<a name="187" href="#187">187</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="188" href="#188">188</a>     }
<a name="189" href="#189">189</a> 
<a name="190" href="#190">190</a>     @Override
<a name="191" href="#191">191</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> setAutoShrink(<strong class="jxr_keyword">boolean</strong> autoShrink) {
<a name="192" href="#192">192</a>         <strong class="jxr_keyword">if</strong> (!recapacityAllowed) {
<a name="193" href="#193">193</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
<a name="194" href="#194">194</a>                     <span class="jxr_string">"Derived buffers and their parent can't be shrinked."</span>);
<a name="195" href="#195">195</a>         }
<a name="196" href="#196">196</a>         <strong class="jxr_keyword">this</strong>.autoShrink = autoShrink;
<a name="197" href="#197">197</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="198" href="#198">198</a>     }
<a name="199" href="#199">199</a> 
<a name="200" href="#200">200</a>     @Override
<a name="201" href="#201">201</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> expand(<strong class="jxr_keyword">int</strong> expectedRemaining) {
<a name="202" href="#202">202</a>         <strong class="jxr_keyword">return</strong> expand(position(), expectedRemaining);
<a name="203" href="#203">203</a>     }
<a name="204" href="#204">204</a> 
<a name="205" href="#205">205</a>     @Override
<a name="206" href="#206">206</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> expand(<strong class="jxr_keyword">int</strong> pos, <strong class="jxr_keyword">int</strong> expectedRemaining) {
<a name="207" href="#207">207</a>         <strong class="jxr_keyword">if</strong> (!recapacityAllowed) {
<a name="208" href="#208">208</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
<a name="209" href="#209">209</a>                     <span class="jxr_string">"Derived buffers and their parent can't be expanded."</span>);
<a name="210" href="#210">210</a>         }
<a name="211" href="#211">211</a> 
<a name="212" href="#212">212</a>         <strong class="jxr_keyword">int</strong> end = pos + expectedRemaining;
<a name="213" href="#213">213</a>         <strong class="jxr_keyword">if</strong> (end &gt; capacity()) {
<a name="214" href="#214">214</a>             <em class="jxr_comment">// The buffer needs expansion.</em>
<a name="215" href="#215">215</a>             capacity(end);
<a name="216" href="#216">216</a>         }
<a name="217" href="#217">217</a> 
<a name="218" href="#218">218</a>         <strong class="jxr_keyword">if</strong> (end &gt; limit()) {
<a name="219" href="#219">219</a>             <em class="jxr_comment">// We call limit() directly to prevent StackOverflowError</em>
<a name="220" href="#220">220</a>             buf().limit(end);
<a name="221" href="#221">221</a>         }
<a name="222" href="#222">222</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="223" href="#223">223</a>     }
<a name="224" href="#224">224</a>     
<a name="225" href="#225">225</a>     @Override
<a name="226" href="#226">226</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/mina/common/IoBuffer.html">IoBuffer</a> shrink() {
<a name="227" href="#227">227</a> 
<a name="228" href="#228">228</a>         <strong class="jxr_keyword">if</strong> (!recapacityAllowed) {
<a name="229" href="#229">229</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
<a name="230" href="#230">230</a>                     <span class="jxr_string">"Derived buffers and their parent can't be expanded."</span>);
<a name="231" href="#231">231</a>         }
<a name="232" href="#232">232</a>         
<a name="233" href="#233">233</a>         <strong class="jxr_keyword">int</strong> position = position();
<a name="234" href="#234">234</a>         <strong class="jxr_keyword">int</strong> capacity = capacity();
<a name="235" href="#235">235</a>         <strong class="jxr_keyword">int</strong> limit = limit();
<a name="236" href="#236">236</a>         <strong class="jxr_keyword">if</strong> (capacity == limit) {
<a name="237" href="#237">237</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="238" href="#238">238</a>         }
<a name="239" href="#239">239</a> 
<a name="240" href="#240">240</a>         <strong class="jxr_keyword">int</strong> newCapacity = capacity;
<a name="241" href="#241">241</a>         <strong class="jxr_keyword">int</strong> minCapacity = Math.max(minimumCapacity, limit);
<a name="242" href="#242">242</a>         <strong class="jxr_keyword">for</strong> (;;) {
<a name="243" href="#243">243</a>             <strong class="jxr_keyword">if</strong> (newCapacity &gt;&gt;&gt; 1 &lt; minCapacity) {
<a name="244" href="#244">244</a>                 <strong class="jxr_keyword">break</strong>;
<a name="245" href="#245">245</a>             }
<a name="246" href="#246">246</a>             newCapacity &gt;&gt;&gt;= 1;
<a name="247" href="#247">247</a>         }
<a name="248" href="#248">248</a>         
<a name="249" href="#249">249</a>         newCapacity = Math.max(minCapacity, newCapacity);
<a name="250" href="#250">250</a>         
<a name="251" href="#251">251</a>         <strong class="jxr_keyword">if</strong> (newCapacity == capacity) {
<a name="252" href="#252">252</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="253" href="#253">253</a>         }
<a name="254" href="#254">254</a> 
<a name="255" href="#255">255</a>         <em class="jxr_comment">// Shrink and compact:</em>
<a name="256" href="#256">256</a>         <em class="jxr_comment">//// Save the state.</em>
<a name="257" href="#257">257</a>         ByteOrder bo = order();
<a name="258" href="#258">258</a> 
<a name="259" href="#259">259</a>         <em class="jxr_comment">//// Reallocate.</em>
<a name="260" href="#260">260</a>         ByteBuffer oldBuf = buf();
<a name="261" href="#261">261</a>         ByteBuffer newBuf = 
<a name="262" href="#262">262</a>             allocator.allocateNioBuffer(newCapacity, isDirect());
<a name="263" href="#263">263</a>         oldBuf.position(0);
<a name="264" href="#264">264</a>         oldBuf.limit(limit);
<a name="265" href="#265">265</a>         newBuf.put(oldBuf);
<a name="266" href="#266">266</a>         buf(newBuf);
<a name="267" href="#267">267</a>         
<a name="268" href="#268">268</a>         <em class="jxr_comment">//// Restore the state.</em>
<a name="269" href="#269">269</a>         buf().position(position);
<a name="270" href="#270">270</a>         buf().limit(limit);
<a name="271" href="#271">271</a>         buf().order(bo);
<a name="272" href="#272">272</a>         mark = -1;
<a name="273" href="#273">273</a>         
<a name="274" href="#274">274</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a name="275" href="#275">275</a>     }
<a name="276" href="#276">276</a> 
<a name="277" href="#277">277</a>     @Override
<a name="278" href="#278">278</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> position() {
<a name="279" href="#279">279</a>         <strong class="jxr_keyword">return</strong> buf().position();
<a name="280" href="#280">280</a>     }
<a name="281" href="#281">281</a> 
<a name="282" href="#282">282</a>     @Override