xmlsettingshandler.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="137" href="#137">137</a>         orderFile = source.getAbsoluteFile();
<a name="138" href="#138">138</a>         <strong>this</strong>.initialize();
<a name="139" href="#139">139</a>         orderFile = tmpOrderFile;
<a name="140" href="#140">140</a>     }
<a name="141" href="#141">141</a> 
<a name="142" href="#142">142</a>     <strong>private</strong> File getSettingsDirectory() {
<a name="143" href="#143">143</a>         String settingsDirectoryName = <strong>null</strong>;
<a name="144" href="#144">144</a>         <strong>try</strong> {
<a name="145" href="#145">145</a>             settingsDirectoryName =
<a name="146" href="#146">146</a>                     (String) getOrder().getAttribute(
<a name="147" href="#147">147</a>                         CrawlOrder.ATTR_SETTINGS_DIRECTORY);
<a name="148" href="#148">148</a>         } <strong>catch</strong> (AttributeNotFoundException e) {
<a name="149" href="#149">149</a>             e.printStackTrace();
<a name="150" href="#150">150</a>         } <strong>catch</strong> (MBeanException e) {
<a name="151" href="#151">151</a>             e.printStackTrace();
<a name="152" href="#152">152</a>         } <strong>catch</strong> (ReflectionException e) {
<a name="153" href="#153">153</a>             e.printStackTrace();
<a name="154" href="#154">154</a>         }
<a name="155" href="#155">155</a> 
<a name="156" href="#156">156</a>         <strong>return</strong> getPathRelativeToWorkingDirectory(settingsDirectoryName);
<a name="157" href="#157">157</a>     }
<a name="158" href="#158">158</a> 
<a name="159" href="#159">159</a>     <em>/**<em>* Resolves the filename for a settings object into a file path.</em></em>
<a name="160" href="#160">160</a> <em>     *</em>
<a name="161" href="#161">161</a> <em>     * It will also create the directory structure leading to this file</em>
<a name="162" href="#162">162</a> <em>     * if it doesn't exist.</em>
<a name="163" href="#163">163</a> <em>     *</em>
<a name="164" href="#164">164</a> <em>     * @param settings the settings object to get file path for.</em>
<a name="165" href="#165">165</a> <em>     * @return the file path for this settings object.</em>
<a name="166" href="#166">166</a> <em>     */</em>
<a name="167" href="#167">167</a>     <strong>protected</strong> <strong>final</strong> File settingsToFilename(<a href="../../../../org/archive/crawler/settings/CrawlerSettings.html">CrawlerSettings</a> settings) {
<a name="168" href="#168">168</a>         File settingsDirectory = getSettingsDirectory();
<a name="169" href="#169">169</a>         File file;
<a name="170" href="#170">170</a> 
<a name="171" href="#171">171</a>         <strong>if</strong> (settings.getScope() == <strong>null</strong> || settings.getScope().equals(<span class="string">""</span>)) {
<a name="172" href="#172">172</a>             <strong>if</strong> (settings.isRefinement()) {
<a name="173" href="#173">173</a>                 file = <strong>new</strong> File(getSettingsDirectory(), File.separatorChar
<a name="174" href="#174">174</a>                         + REFINEMENT_DIR + File.separatorChar
<a name="175" href="#175">175</a>                         + settings.getName() + '.' + settingsFilenameSuffix);
<a name="176" href="#176">176</a>             } <strong>else</strong> {
<a name="177" href="#177">177</a>                 file = orderFile;
<a name="178" href="#178">178</a>             }
<a name="179" href="#179">179</a>         } <strong>else</strong> {
<a name="180" href="#180">180</a>             String elements[] = settings.getScope().split(<span class="string">"&#47;&#47;."</span>);
<a name="181" href="#181">181</a>             <strong>if</strong> (elements.length == 0) {
<a name="182" href="#182">182</a>                 <strong>return</strong> orderFile;
<a name="183" href="#183">183</a>             }
<a name="184" href="#184">184</a> 
<a name="185" href="#185">185</a>             StringBuffer path = <strong>new</strong> StringBuffer();
<a name="186" href="#186">186</a>             <strong>for</strong> (<strong>int</strong> i = elements.length - 1; i > 0; i--) {
<a name="187" href="#187">187</a>                 path.append(elements[i]);
<a name="188" href="#188">188</a>                 path.append(File.separatorChar);
<a name="189" href="#189">189</a>             }
<a name="190" href="#190">190</a>             path.append(elements[0]);
<a name="191" href="#191">191</a> 
<a name="192" href="#192">192</a>             <strong>if</strong> (settings.isRefinement()) {
<a name="193" href="#193">193</a>                 file = <strong>new</strong> File(getSettingsDirectory(), path.toString()
<a name="194" href="#194">194</a>                         + File.separatorChar + REFINEMENT_DIR
<a name="195" href="#195">195</a>                         + File.separatorChar + settings.getName() + '.'
<a name="196" href="#196">196</a>                         + settingsFilenameSuffix);
<a name="197" href="#197">197</a>             } <strong>else</strong> {
<a name="198" href="#198">198</a>                 file = <strong>new</strong> File(getSettingsDirectory(), path.toString()
<a name="199" href="#199">199</a>                         + File.separatorChar + settingsFilename + <span class="string">"."</span>
<a name="200" href="#200">200</a>                         + settingsFilenameSuffix);
<a name="201" href="#201">201</a>             }
<a name="202" href="#202">202</a>         }
<a name="203" href="#203">203</a>         <strong>return</strong> file;
<a name="204" href="#204">204</a>     }
<a name="205" href="#205">205</a> 
<a name="206" href="#206">206</a>     <strong>public</strong> <strong>final</strong> <strong>void</strong> writeSettingsObject(<a href="../../../../org/archive/crawler/settings/CrawlerSettings.html">CrawlerSettings</a> settings) {
<a name="207" href="#207">207</a>         File filename = settingsToFilename(settings);
<a name="208" href="#208">208</a>         writeSettingsObject(settings, filename);
<a name="209" href="#209">209</a>     }
<a name="210" href="#210">210</a> 
<a name="211" href="#211">211</a>     <em>/**<em>* Write a CrawlerSettings object to a specified file.</em></em>
<a name="212" href="#212">212</a> <em>     *</em>
<a name="213" href="#213">213</a> <em>     * This method is similar to {@link #writeSettingsObject(CrawlerSettings)}</em>
<a name="214" href="#214">214</a> <em>     * except that it uses the submitted File object instead of trying to</em>
<a name="215" href="#215">215</a> <em>     * resolve where the file should be written.</em>
<a name="216" href="#216">216</a> <em>     *</em>
<a name="217" href="#217">217</a> <em>     * @param settings the settings object to be serialized.</em>
<a name="218" href="#218">218</a> <em>     * @param filename the file to which the settings object should be written.</em>
<a name="219" href="#219">219</a> <em>     */</em>
<a name="220" href="#220">220</a>     <strong>public</strong> <strong>final</strong> <strong>void</strong> writeSettingsObject(
<a name="221" href="#221">221</a>             <a href="../../../../org/archive/crawler/settings/CrawlerSettings.html">CrawlerSettings</a> settings, File filename) {
<a name="222" href="#222">222</a> 
<a name="223" href="#223">223</a>         logger.fine(<span class="string">"Writing "</span> + filename.getAbsolutePath());
<a name="224" href="#224">224</a>         filename.getParentFile().mkdirs();
<a name="225" href="#225">225</a> 
<a name="226" href="#226">226</a>         <strong>try</strong> {
<a name="227" href="#227">227</a>             <strong>long</strong> lastSaved = 0L;
<a name="228" href="#228">228</a>             File backup = <strong>null</strong>;
<a name="229" href="#229">229</a>             <strong>if</strong> (getOrder().getController() != <strong>null</strong> &amp;&amp; filename.exists()) {
<a name="230" href="#230">230</a>                 <em class="comment">// The crawler is running and file exists - make backup first.</em>
<a name="231" href="#231">231</a>                 String name = filename.getName();
<a name="232" href="#232">232</a>                 lastSaved = settings.getLastSavedTime().getTime();
<a name="233" href="#233">233</a>                 name = name.substring(0, name.lastIndexOf('.')) + '_'
<a name="234" href="#234">234</a>                         + ArchiveUtils.get14DigitDate(lastSaved) + <span class="string">"."</span>
<a name="235" href="#235">235</a>                         + settingsFilenameSuffix;
<a name="236" href="#236">236</a>                 backup = <strong>new</strong> File(filename.getParentFile(), name);
<a name="237" href="#237">237</a>                 FileUtils.copyFiles(filename, backup);
<a name="238" href="#238">238</a>             }
<a name="239" href="#239">239</a> 
<a name="240" href="#240">240</a>             StreamResult result =
<a name="241" href="#241">241</a>                 <strong>new</strong> StreamResult(
<a name="242" href="#242">242</a>                     <strong>new</strong> BufferedOutputStream(<strong>new</strong> FileOutputStream(filename)));
<a name="243" href="#243">243</a>             Transformer transformer =
<a name="244" href="#244">244</a>                 TransformerFactory.newInstance().newTransformer();
<a name="245" href="#245">245</a>             Source source = <strong>new</strong> <a href="../../../../org/archive/crawler/settings/CrawlSettingsSAXSource.html">CrawlSettingsSAXSource</a>(settings);
<a name="246" href="#246">246</a>             transformer.transform(source, result);
<a name="247" href="#247">247</a> 
<a name="248" href="#248">248</a>             <em class="comment">// Hack to get rid of unnesessary backupfiles.</em>
<a name="249" href="#249">249</a>             <em class="comment">// What happens is that the WUI often saves settings files</em>
<a name="250" href="#250">250</a>             <em class="comment">// several times during a settings change. This code removes the</em>
<a name="251" href="#251">251</a>             <em class="comment">// last backup file if its no more than 2 minutes old.</em>
<a name="252" href="#252">252</a>             <strong>if</strong> (lastSaved > (System.currentTimeMillis() - 2 * 60 * 1000)) {
<a name="253" href="#253">253</a>                 backup.delete();
<a name="254" href="#254">254</a>             }
<a name="255" href="#255">255</a>         } <strong>catch</strong> (Exception e) {
<a name="256" href="#256">256</a>             e.printStackTrace();
<a name="257" href="#257">257</a>         }
<a name="258" href="#258">258</a>     }
<a name="259" href="#259">259</a> 
<a name="260" href="#260">260</a>     <em>/**<em>* Read the CrawlerSettings object from a specific file.</em></em>
<a name="261" href="#261">261</a> <em>     *</em>
<a name="262" href="#262">262</a> <em>     * @param settings the settings object to be updated with data from the</em>
<a name="263" href="#263">263</a> <em>     *                 persistent storage.</em>
<a name="264" href="#264">264</a> <em>     * @param f the file to read from.</em>
<a name="265" href="#265">265</a> <em>     * @return the updated settings object or null if there was no data for this</em>
<a name="266" href="#266">266</a> <em>     *         in the persistent storage.</em>
<a name="267" href="#267">267</a> <em>     */</em>    
<a name="268" href="#268">268</a>     <strong>protected</strong> <strong>final</strong> <a href="../../../../org/archive/crawler/settings/CrawlerSettings.html">CrawlerSettings</a> readSettingsObject(<a href="../../../../org/archive/crawler/settings/CrawlerSettings.html">CrawlerSettings</a> settings,
<a name="269" href="#269">269</a>             File f) {
<a name="270" href="#270">270</a>         <a href="../../../../org/archive/crawler/settings/CrawlerSettings.html">CrawlerSettings</a> result = <strong>null</strong>;
<a name="271" href="#271">271</a>         <strong>try</strong> {
<a name="272" href="#272">272</a>             InputStream is = <strong>null</strong>;
<a name="273" href="#273">273</a>             <strong>if</strong> (!f.exists()) {
<a name="274" href="#274">274</a>                 <em class="comment">// Perhaps the file we're looking for is on the CLASSPATH.</em>
<a name="275" href="#275">275</a>                 <em class="comment">// DON'T look on the CLASSPATH for 'settings.xml' files.  The</em>
<a name="276" href="#276">276</a>                 <em class="comment">// look for 'settings.xml' files happens frequently. Not looking</em>
<a name="277" href="#277">277</a>                 <em class="comment">// on classpath for 'settings.xml' is an optimization based on</em>
<a name="278" href="#278">278</a>                 <em class="comment">// ASSUMPTION that there will never be a 'settings.xml' saved</em>
<a name="279" href="#279">279</a>                 <em class="comment">// on classpath.</em>
<a name="280" href="#280">280</a>                 <strong>if</strong> (!f.getName().startsWith(settingsFilename)) {
<a name="281" href="#281">281</a>                     is = XMLSettingsHandler.<strong>class</strong>.