rss090parser.html

解析RSS工具源码

<a name="167" href="#167">167</a>         <em class="comment">// channel modules from the root RSS element.</em>
<a name="168" href="#168">168</a>         List allFeedModules = <strong>new</strong> ArrayList();
<a name="169" href="#169">169</a>         List rootModules = parseFeedModules(rssRoot);
<a name="170" href="#170">170</a>         List channelModules = parseFeedModules(eChannel); 
<a name="171" href="#171">171</a>         <strong>if</strong> (rootModules != <strong>null</strong>) {
<a name="172" href="#172">172</a>             allFeedModules.addAll(rootModules);
<a name="173" href="#173">173</a>         }
<a name="174" href="#174">174</a>         <strong>if</strong> (channelModules != <strong>null</strong>) {
<a name="175" href="#175">175</a>             allFeedModules.addAll(channelModules);
<a name="176" href="#176">176</a>         }
<a name="177" href="#177">177</a>         channel.setModules(allFeedModules);
<a name="178" href="#178">178</a>         channel.setItems(parseItems(rssRoot));
<a name="179" href="#179">179</a> 
<a name="180" href="#180">180</a>         List foreignMarkup = 
<a name="181" href="#181">181</a>             extractForeignMarkup(eChannel, channel, getRSSNamespace());
<a name="182" href="#182">182</a>         <strong>if</strong> (foreignMarkup.size() > 0) {
<a name="183" href="#183">183</a>             channel.setForeignMarkup(foreignMarkup);
<a name="184" href="#184">184</a>         }          
<a name="185" href="#185">185</a>         <strong>return</strong> channel;
<a name="186" href="#186">186</a>     }
<a name="187" href="#187">187</a> 
<a name="188" href="#188">188</a> 
<a name="189" href="#189">189</a>     <em>/**<em>*</em></em>
<a name="190" href="#190">190</a> <em>     * This method exists because RSS0.90 and RSS1.0 have the 'item' elements under the root elemment.</em>
<a name="191" href="#191">191</a> <em>     * And RSS0.91, RSS0.02, RSS0.93, RSS0.94 and RSS2.0 have the item elements under the 'channel' element.</em>
<a name="192" href="#192">192</a> <em>     * &lt;p/></em>
<a name="193" href="#193">193</a> <em>     */</em>
<a name="194" href="#194">194</a>     <strong>protected</strong> List getItems(Element rssRoot) {
<a name="195" href="#195">195</a>         <strong>return</strong> rssRoot.getChildren(<span class="string">"item"</span>,getRSSNamespace());
<a name="196" href="#196">196</a>     }
<a name="197" href="#197">197</a> 
<a name="198" href="#198">198</a>     <em>/**<em>*</em></em>
<a name="199" href="#199">199</a> <em>     * This method exists because RSS0.90 and RSS1.0 have the 'image' element under the root elemment.</em>
<a name="200" href="#200">200</a> <em>     * And RSS0.91, RSS0.02, RSS0.93, RSS0.94 and RSS2.0 have it under the 'channel' element.</em>
<a name="201" href="#201">201</a> <em>     * &lt;p/></em>
<a name="202" href="#202">202</a> <em>     */</em>
<a name="203" href="#203">203</a>     <strong>protected</strong> Element getImage(Element rssRoot) {
<a name="204" href="#204">204</a>         <strong>return</strong> rssRoot.getChild(<span class="string">"image"</span>,getRSSNamespace());
<a name="205" href="#205">205</a>     }
<a name="206" href="#206">206</a> 
<a name="207" href="#207">207</a>     <em>/**<em>*</em></em>
<a name="208" href="#208">208</a> <em>     * This method exists because RSS0.90 and RSS1.0 have the 'textinput' element under the root elemment.</em>
<a name="209" href="#209">209</a> <em>     * And RSS0.91, RSS0.02, RSS0.93, RSS0.94 and RSS2.0 have it under the 'channel' element.</em>
<a name="210" href="#210">210</a> <em>     * &lt;p/></em>
<a name="211" href="#211">211</a> <em>     */</em>
<a name="212" href="#212">212</a>     <strong>protected</strong> Element getTextInput(Element rssRoot) {
<a name="213" href="#213">213</a>         <strong>return</strong> rssRoot.getChild(<span class="string">"textinput"</span>,getRSSNamespace());
<a name="214" href="#214">214</a>     }
<a name="215" href="#215">215</a> 
<a name="216" href="#216">216</a>     <em>/**<em>*</em></em>
<a name="217" href="#217">217</a> <em>     * Parses the root element of an RSS document looking for  image information.</em>
<a name="218" href="#218">218</a> <em>     * &lt;p/></em>
<a name="219" href="#219">219</a> <em>     * It reads title and url out of the 'image' element.</em>
<a name="220" href="#220">220</a> <em>     * &lt;p/></em>
<a name="221" href="#221">221</a> <em>     *</em>
<a name="222" href="#222">222</a> <em>     * @param rssRoot the root element of the RSS document to parse for image information.</em>
<a name="223" href="#223">223</a> <em>     * @return the parsed image bean.</em>
<a name="224" href="#224">224</a> <em>     */</em>
<a name="225" href="#225">225</a>     <strong>protected</strong> <a href="../../../../../com/sun/syndication/feed/rss/Image.html">Image</a> parseImage(Element rssRoot) {
<a name="226" href="#226">226</a>         <a href="../../../../../com/sun/syndication/feed/rss/Image.html">Image</a> image = <strong>null</strong>;
<a name="227" href="#227">227</a>         Element eImage = getImage(rssRoot);
<a name="228" href="#228">228</a>         <strong>if</strong> (eImage!=<strong>null</strong>) {
<a name="229" href="#229">229</a>             image = <strong>new</strong> <a href="../../../../../com/sun/syndication/feed/rss/Image.html">Image</a>();
<a name="230" href="#230">230</a> 
<a name="231" href="#231">231</a>             Element e = eImage.getChild(<span class="string">"title"</span>,getRSSNamespace());
<a name="232" href="#232">232</a>             <strong>if</strong> (e!=<strong>null</strong>) {
<a name="233" href="#233">233</a>                 image.setTitle(e.getText());
<a name="234" href="#234">234</a>             }
<a name="235" href="#235">235</a>             e = eImage.getChild(<span class="string">"url"</span>,getRSSNamespace());
<a name="236" href="#236">236</a>             <strong>if</strong> (e!=<strong>null</strong>) {
<a name="237" href="#237">237</a>                 image.setUrl(e.getText());
<a name="238" href="#238">238</a>             }
<a name="239" href="#239">239</a>             e = eImage.getChild(<span class="string">"link"</span>,getRSSNamespace());
<a name="240" href="#240">240</a>             <strong>if</strong> (e!=<strong>null</strong>) {
<a name="241" href="#241">241</a>                 image.setLink(e.getText());
<a name="242" href="#242">242</a>             }
<a name="243" href="#243">243</a>         }
<a name="244" href="#244">244</a>         <strong>return</strong> image;
<a name="245" href="#245">245</a>     }
<a name="246" href="#246">246</a> 
<a name="247" href="#247">247</a>     <em>/**<em>*</em></em>
<a name="248" href="#248">248</a> <em>     * Parses the root element of an RSS document looking for all items information.</em>
<a name="249" href="#249">249</a> <em>     * &lt;p/></em>
<a name="250" href="#250">250</a> <em>     * It iterates through the item elements list, obtained from the getItems() method, and invoke parseItem()</em>
<a name="251" href="#251">251</a> <em>     * for each item element. The resulting RSSItem of each item element is stored in a list.</em>
<a name="252" href="#252">252</a> <em>     * &lt;p/></em>
<a name="253" href="#253">253</a> <em>     *</em>
<a name="254" href="#254">254</a> <em>     * @param rssRoot the root element of the RSS document to parse for all items information.</em>
<a name="255" href="#255">255</a> <em>     * @return a list with all the parsed RSSItem beans.</em>
<a name="256" href="#256">256</a> <em>     */</em>
<a name="257" href="#257">257</a>     <strong>protected</strong> List parseItems(Element rssRoot)  {
<a name="258" href="#258">258</a>         Collection eItems = getItems(rssRoot);
<a name="259" href="#259">259</a> 
<a name="260" href="#260">260</a>         List items = <strong>new</strong> ArrayList();
<a name="261" href="#261">261</a>         <strong>for</strong> (Iterator i=eItems.iterator();i.hasNext();) {
<a name="262" href="#262">262</a>             Element eItem = (Element) i.next();
<a name="263" href="#263">263</a>             items.add(parseItem(rssRoot,eItem));
<a name="264" href="#264">264</a>         }
<a name="265" href="#265">265</a>         <strong>return</strong> items;
<a name="266" href="#266">266</a>     }
<a name="267" href="#267">267</a> 
<a name="268" href="#268">268</a>     <em>/**<em>*</em></em>
<a name="269" href="#269">269</a> <em>     * Parses an item element of an RSS document looking for item information.</em>
<a name="270" href="#270">270</a> <em>     * &lt;p/></em>
<a name="271" href="#271">271</a> <em>     * It reads title and link out of the 'item' element.</em>
<a name="272" href="#272">272</a> <em>     * &lt;p/></em>
<a name="273" href="#273">273</a> <em>     *</em>
<a name="274" href="#274">274</a> <em>     * @param rssRoot the root element of the RSS document in case it's needed for context.</em>
<a name="275" href="#275">275</a> <em>     * @param eItem the item element to parse.</em>
<a name="276" href="#276">276</a> <em>     * @return the parsed RSSItem bean.</em>
<a name="277" href="#277">277</a> <em>     */</em>
<a name="278" href="#278">278</a>     <strong>protected</strong> <a href="../../../../../com/sun/syndication/feed/rss/Item.html">Item</a> parseItem(Element rssRoot,Element eItem) {
<a name="279" href="#279">279</a>         <a href="../../../../../com/sun/syndication/feed/rss/Item.html">Item</a> item = <strong>new</strong> <a href="../../../../../com/sun/syndication/feed/rss/Item.html">Item</a>();
<a name="280" href="#280">280</a>         Element e = eItem.getChild(<span class="string">"title"</span>,getRSSNamespace());
<a name="281" href="#281">281</a>         <strong>if</strong> (e!=<strong>null</strong>) {
<a name="282" href="#282">282</a>             item.setTitle(e.getText());
<a name="283" href="#283">283</a>         }
<a name="284" href="#284">284</a>         e = eItem.getChild(<span class="string">"link"</span>,getRSSNamespace());
<a name="285" href="#285">285</a>         <strong>if</strong> (e!=<strong>null</strong>) {
<a name="286" href="#286">286</a>             item.setLink(e.getText());
<a name="287" href="#287">287</a>         }
<a name="288" href="#288">288</a>         
<a name="289" href="#289">289</a>         item.setModules(parseItemModules(eItem));
<a name="290" href="#290">290</a>                 
<a name="291" href="#291">291</a>         List foreignMarkup = 
<a name="292" href="#292">292</a>             extractForeignMarkup(eItem, item, getRSSNamespace());
<a name="293" href="#293">293</a>         <strong>if</strong> (foreignMarkup.size() > 0) {
<a name="294" href="#294">294</a>             item.setForeignMarkup(foreignMarkup);
<a name="295" href="#295">295</a>         }
<a name="296" href="#296">296</a>         <strong>return</strong> item;
<a name="297" href="#297">297</a>     }
<a name="298" href="#298">298</a> 
<a name="299" href="#299">299</a> 
<a name="300" href="#300">300</a>     <em>/**<em>*</em></em>
<a name="301" href="#301">301</a> <em>     * Parses the root element of an RSS document looking for  text-input information.</em>
<a name="302" href="#302">302</a> <em>     * &lt;p/></em>
<a name="303" href="#303">303</a> <em>     * It reads title, description, name and link out of the 'textinput' or 'textInput' element.</em>
<a name="304" href="#304">304</a> <em>     * &lt;p/></em>
<a name="305" href="#305">305</a> <em>     *</em>
<a name="306" href="#306">306</a> <em>     * @param rssRoot the root element of the RSS document to parse for text-input information.</em>
<a name="307" href="#307">307</a> <em>     * @return the parsed RSSTextInput bean.</em>
<a name="308" href="#308">308</a> <em>     */</em>
<a name="309" href="#309">309</a>     <strong>protected</strong> <a href="../../../../../com/sun/syndication/feed/rss/TextInput.html">TextInput</a> parseTextInput(Element rssRoot) {
<a name="310" href="#310">310</a>         <a href="../../../../../com/sun/syndication/feed/rss/TextInput.html">TextInput</a> textInput = <strong>null</strong>;
<a name="311" href="#311">311</a>         Element eTextInput = getTextInput(rssRoot);
<a name="312" href="#312">312</a>         <strong>if</strong> (eTextInput!=<strong>null</strong>) {
<a name="313" href="#313">313</a>             textInput = <strong>new</strong> <a href="../../../../../com/sun/syndication/feed/rss/TextInput.html">TextInput</a>();
<a name="314" href="#314">314</a>             Element e = eTextInput.getChild(<span class="string">"title"</span>,getRSSNamespace());
<a name="315" href="#315">315</a>             <strong>if</strong> (e!=<strong>null</strong>) {
<a name="316" href="#316">316</a>                 textInput.setTitle(e.getText());
<a name="317" href="#317">317</a>             }
<a name="318" href="#318">318</a>             e = eTextInput.getChild(<span class="string">"description"</span>,getRSSNamespace());
<a name="319" href="#319">319</a>             <strong>if</strong> (e!=<strong>null</strong>) {
<a name="320" href="#320">320</a>                 textInput.setDescription(e.getText());
<a name="321" href="#321">321</a>             }
<a name="322" href="#322">322</a>             e = eTextInput.getChild(<span class="string">"name"</span>,getRSSNamespace());
<a name="323" href="#323">323</a>             <strong>if</strong> (e!=<strong>null</strong>) {
<a name="324" href="#324">324</a>                 textInput.setName(e.getText());
<a name="325" href="#325">325</a>             }
<a name="326" href="#326">326</a>             e = eTextInput.getChild(<span class="string">"link"</span>,getRSSNamespace());
<a name="327" href="#327">327</a>             <strong>if</strong> (e!=<strong>null</strong>) {
<a name="328" href="#328">328</a>                 textInput.setLink(e.getText());
<a name="329" href="#329">329</a>             }
<a name="330" href="#330">330</a>         }
<a name="331" href="#331">331</a>         <strong>return</strong> textInput;
<a name="332" href="#332">332</a>     }
<a name="333" href="#333">333</a> 
<a name="334" href="#334">334</a> 
<a name="335" href="#335">335</a> }
</pre>
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