atom10parser.html

来自「rsslibj-1_0RC2,RSS阅读」· HTML 代码 · 共 665 行 · 第 1/4 页

<a name="493" href="#493">493</a>                 <strong>int</strong> slashslash = baseURI.indexOf(<span class="string">"//"</span>);
<a name="494" href="#494">494</a>                 <strong>int</strong> nextslash = baseURI.indexOf(<span class="string">"/"</span>, slashslash + 2);
<a name="495" href="#495">495</a>                 <strong>if</strong> (nextslash != -1) base = baseURI.substring(0, nextslash);
<a name="496" href="#496">496</a>                 <strong>return</strong> formURI(base, url);               
<a name="497" href="#497">497</a>             } 
<a name="498" href="#498">498</a> 
<a name="499" href="#499">499</a>             <em class="comment">// Relative URI with parent</em>
<a name="500" href="#500">500</a>             <strong>if</strong> (parent != <strong>null</strong> &amp;&amp; parent instanceof Element) {
<a name="501" href="#501">501</a> 
<a name="502" href="#502">502</a>                 <em class="comment">// Do we have an xml:base?         </em>
<a name="503" href="#503">503</a>                 String xmlbase = ((Element)parent).getAttributeValue(
<a name="504" href="#504">504</a>                     <span class="string">"base"</span>, Namespace.XML_NAMESPACE);
<a name="505" href="#505">505</a>                 <strong>if</strong> (xmlbase != <strong>null</strong> &amp;&amp; xmlbase.trim().length() > 0) {
<a name="506" href="#506">506</a>                     <strong>if</strong> (isAbsoluteURI(xmlbase)) {
<a name="507" href="#507">507</a>                         <em class="comment">// Absolute xml:base, so form URI right now </em>
<a name="508" href="#508">508</a>                         <strong>if</strong> (url.startsWith(<span class="string">"/"</span>)) { 
<a name="509" href="#509">509</a>                             <em class="comment">// Host relative URI</em>
<a name="510" href="#510">510</a>                             <strong>int</strong> slashslash = xmlbase.indexOf(<span class="string">"//"</span>);
<a name="511" href="#511">511</a>                             <strong>int</strong> nextslash = xmlbase.indexOf(<span class="string">"/"</span>, slashslash + 2);
<a name="512" href="#512">512</a>                             <strong>if</strong> (nextslash != -1) xmlbase = xmlbase.substring(0, nextslash);
<a name="513" href="#513">513</a>                             <strong>return</strong> formURI(xmlbase, url); 
<a name="514" href="#514">514</a>                         }
<a name="515" href="#515">515</a>                         <strong>if</strong> (!xmlbase.endsWith(<span class="string">"/"</span>)) {
<a name="516" href="#516">516</a>                             <em class="comment">// Base URI is filename, strip it off </em>
<a name="517" href="#517">517</a>                             xmlbase = xmlbase.substring(0, xmlbase.lastIndexOf(<span class="string">"/"</span>));
<a name="518" href="#518">518</a>                         }
<a name="519" href="#519">519</a>                         <strong>return</strong> formURI(xmlbase, url);
<a name="520" href="#520">520</a>                     } <strong>else</strong> {
<a name="521" href="#521">521</a>                         <em class="comment">// Relative xml:base, so walk up tree</em>
<a name="522" href="#522">522</a>                         <strong>return</strong> resolveURI(baseURI, parent.getParent(), 
<a name="523" href="#523">523</a>                             stripTrailingSlash(xmlbase) + <span class="string">"/"</span>+ stripStartingSlash(url));
<a name="524" href="#524">524</a>                     }
<a name="525" href="#525">525</a>                 }
<a name="526" href="#526">526</a>                 <em class="comment">// No xml:base so walk up tree</em>
<a name="527" href="#527">527</a>                 <strong>return</strong> resolveURI(baseURI, parent.getParent(), url);
<a name="528" href="#528">528</a> 
<a name="529" href="#529">529</a>             <em class="comment">// Relative URI with no parent (i.e. top of tree), so form URI right now</em>
<a name="530" href="#530">530</a>             } <strong>else</strong> <strong>if</strong> (parent == <strong>null</strong> || parent instanceof Document) {
<a name="531" href="#531">531</a>                 <strong>return</strong> formURI(baseURI, url);        
<a name="532" href="#532">532</a>             } 
<a name="533" href="#533">533</a>         }                
<a name="534" href="#534">534</a>         <strong>return</strong> url;
<a name="535" href="#535">535</a>     }
<a name="536" href="#536">536</a>         
<a name="537" href="#537">537</a>     <em>/**<em>*</em></em>
<a name="538" href="#538">538</a> <em>     * Find base URI of feed considering relative URIs.</em>
<a name="539" href="#539">539</a> <em>     * @param root Root element of feed.</em>
<a name="540" href="#540">540</a> <em>     */</em>
<a name="541" href="#541">541</a>     <strong>private</strong> String findBaseURI(Element root) throws MalformedURLException {
<a name="542" href="#542">542</a>         String ret = <strong>null</strong>;
<a name="543" href="#543">543</a>         <strong>if</strong> (findAtomLink(root, <span class="string">"self"</span>) != <strong>null</strong>) {
<a name="544" href="#544">544</a>             ret = findAtomLink(root, <span class="string">"self"</span>);
<a name="545" href="#545">545</a>             <strong>if</strong> (<span class="string">"."</span>.equals(ret) || <span class="string">"./"</span>.equals(ret)) ret = <span class="string">""</span>;
<a name="546" href="#546">546</a>             <strong>if</strong> (ret.indexOf(<span class="string">"/"</span>) != -1) ret = ret.substring(0, ret.lastIndexOf(<span class="string">"/"</span>));
<a name="547" href="#547">547</a>             ret = resolveURI(<strong>null</strong>, root, ret);
<a name="548" href="#548">548</a>         }
<a name="549" href="#549">549</a>         <strong>return</strong> ret;
<a name="550" href="#550">550</a>     }
<a name="551" href="#551">551</a>     
<a name="552" href="#552">552</a>     <em>/**<em>* </em></em>
<a name="553" href="#553">553</a> <em>     * Return URL string of Atom link element under parent element.</em>
<a name="554" href="#554">554</a> <em>     * Link with no rel attribute is considered to be rel="alternate"</em>
<a name="555" href="#555">555</a> <em>     * @param parent Consider only children of this parent element</em>
<a name="556" href="#556">556</a> <em>     * @param rel    Consider only links with this relationship</em>
<a name="557" href="#557">557</a> <em>     */</em>
<a name="558" href="#558">558</a>     <strong>private</strong>  String findAtomLink(Element parent, String rel) {
<a name="559" href="#559">559</a>         String ret = <strong>null</strong>;
<a name="560" href="#560">560</a>         List linksList = parent.getChildren(<span class="string">"link"</span>, ATOM_10_NS);
<a name="561" href="#561">561</a>         <strong>if</strong> (linksList != <strong>null</strong>) {
<a name="562" href="#562">562</a>             <strong>for</strong> (Iterator links = linksList.iterator(); links.hasNext(); ) {
<a name="563" href="#563">563</a>                 Element link = (Element)links.next();
<a name="564" href="#564">564</a>                 Attribute relAtt = getAttribute(link, <span class="string">"rel"</span>);
<a name="565" href="#565">565</a>                 Attribute hrefAtt = getAttribute(link, <span class="string">"href"</span>);
<a name="566" href="#566">566</a>                 <strong>if</strong> (   (relAtt == <strong>null</strong> &amp;&amp; <span class="string">"alternate"</span>.equals(rel)) 
<a name="567" href="#567">567</a>                     || (relAtt != <strong>null</strong> &amp;&amp; relAtt.getValue().equals(rel))) {
<a name="568" href="#568">568</a>                     ret = hrefAtt.getValue();
<a name="569" href="#569">569</a>                     <strong>break</strong>;
<a name="570" href="#570">570</a>                 }
<a name="571" href="#571">571</a>             }
<a name="572" href="#572">572</a>         }
<a name="573" href="#573">573</a>         <strong>return</strong> ret;
<a name="574" href="#574">574</a>     }
<a name="575" href="#575">575</a>         
<a name="576" href="#576">576</a>     <em>/**<em>* </em></em>
<a name="577" href="#577">577</a> <em>     * Form URI by combining base with append portion and giving </em>
<a name="578" href="#578">578</a> <em>     * special consideration to append portions that begin with ".."</em>
<a name="579" href="#579">579</a> <em>     * @param base   Base of URI, may end with trailing slash</em>
<a name="580" href="#580">580</a> <em>     * @param append String to append, may begin with slash or ".."</em>
<a name="581" href="#581">581</a> <em>     */</em>
<a name="582" href="#582">582</a>     <strong>private</strong> <strong>static</strong> String formURI(String base, String append) {
<a name="583" href="#583">583</a>         base = stripTrailingSlash(base);
<a name="584" href="#584">584</a>         append = stripStartingSlash(append);
<a name="585" href="#585">585</a>         <strong>if</strong> (append.startsWith(<span class="string">".."</span>)) {
<a name="586" href="#586">586</a>             String ret = <strong>null</strong>;
<a name="587" href="#587">587</a>             String[] parts = append.split(<span class="string">"/"</span>);
<a name="588" href="#588">588</a>             <strong>for</strong> (<strong>int</strong> i=0; i&lt;parts.length; i++) {
<a name="589" href="#589">589</a>                 <strong>if</strong> (<span class="string">".."</span>.equals(parts[i])) {
<a name="590" href="#590">590</a>                     <strong>int</strong> last = base.lastIndexOf(<span class="string">"/"</span>);
<a name="591" href="#591">591</a>                     <strong>if</strong> (last != -1) {
<a name="592" href="#592">592</a>                         base = base.substring(0, last);
<a name="593" href="#593">593</a>                         append = append.substring(3, append.length());
<a name="594" href="#594">594</a>                     }
<a name="595" href="#595">595</a>                     <strong>else</strong> <strong>break</strong>;
<a name="596" href="#596">596</a>                 }
<a name="597" href="#597">597</a>             }
<a name="598" href="#598">598</a>         }
<a name="599" href="#599">599</a>         <strong>return</strong> base + <span class="string">"/"</span> + append;
<a name="600" href="#600">600</a>     }
<a name="601" href="#601">601</a>     
<a name="602" href="#602">602</a>     <em>/**<em>* </em></em>
<a name="603" href="#603">603</a> <em>     * Strip starting slash from beginning of string.</em>
<a name="604" href="#604">604</a> <em>     */</em>
<a name="605" href="#605">605</a>     <strong>private</strong> <strong>static</strong> String stripStartingSlash(String s) {
<a name="606" href="#606">606</a>         <strong>if</strong> (s != <strong>null</strong> &amp;&amp; s.startsWith(<span class="string">"/"</span>)) {
<a name="607" href="#607">607</a>             s = s.substring(1, s.length());
<a name="608" href="#608">608</a>         }
<a name="609" href="#609">609</a>         <strong>return</strong> s;
<a name="610" href="#610">610</a>     }
<a name="611" href="#611">611</a>     
<a name="612" href="#612">612</a>     <em>/**<em>* </em></em>
<a name="613" href="#613">613</a> <em>     * Strip trailing slash from end of string.</em>
<a name="614" href="#614">614</a> <em>     */</em>
<a name="615" href="#615">615</a>     <strong>private</strong> <strong>static</strong> String stripTrailingSlash(String s) {
<a name="616" href="#616">616</a>         <strong>if</strong> (s != <strong>null</strong> &amp;&amp; s.endsWith(<span class="string">"/"</span>)) {
<a name="617" href="#617">617</a>             s = s.substring(0, s.length() - 1);
<a name="618" href="#618">618</a>         }
<a name="619" href="#619">619</a>         <strong>return</strong> s;
<a name="620" href="#620">620</a>     }    
<a name="621" href="#621">621</a> 
<a name="622" href="#622">622</a>     
<a name="623" href="#623">623</a>     <em>/**<em>*</em></em>
<a name="624" href="#624">624</a> <em>     * Parse entry from reader.</em>
<a name="625" href="#625">625</a> <em>     */</em>
<a name="626" href="#626">626</a>     <strong>public</strong> <strong>static</strong> <a href="../../../../../com/sun/syndication/feed/atom/Entry.html">Entry</a> parseEntry(Reader rd, String baseURI)
<a name="627" href="#627">627</a>         throws JDOMException, IOException, IllegalArgumentException, <a href="../../../../../com/sun/syndication/io/FeedException.html">FeedException</a> {
<a name="628" href="#628">628</a>         <em class="comment">// Parse entry into JDOM tree</em>
<a name="629" href="#629">629</a>         <a href="../../../../../com/sun/syndication/io/SAXBuilder.html">SAXBuilder</a> builder = <strong>new</strong> <a href="../../../../../com/sun/syndication/io/SAXBuilder.html">SAXBuilder</a>();
<a name="630" href="#630">630</a>         Document entryDoc = builder.build(rd);
<a name="631" href="#631">631</a>         Element fetchedEntryElement = entryDoc.getRootElement();
<a name="632" href="#632">632</a>         fetchedEntryElement.detach();
<a name="633" href="#633">633</a> 
<a name="634" href="#634">634</a>         <em class="comment">// Put entry into a JDOM document with 'feed' root so that Rome can handle it</em>
<a name="635" href="#635">635</a>         <a href="../../../../../com/sun/syndication/feed/atom/Feed.html">Feed</a> feed = <strong>new</strong> <a href="../../../../../com/sun/syndication/feed/atom/Feed.html">Feed</a>();
<a name="636" href="#636">636</a>         feed.setFeedType(<span class="string">"atom_1.0"</span>);
<a name="637" href="#637">637</a>         <a href="../../../../../com/sun/syndication/io/WireFeedOutput.html">WireFeedOutput</a> wireFeedOutput = <strong>new</strong> <a href="../../../../../com/sun/syndication/io/WireFeedOutput.html">WireFeedOutput</a>();
<a name="638" href="#638">638</a>         Document feedDoc = wireFeedOutput.outputJDom(feed);
<a name="639" href="#639">639</a>         feedDoc.getRootElement().addContent(fetchedEntryElement);
<a name="640" href="#640">640</a>         
<a name="641" href="#641">641</a>         <strong>if</strong> (baseURI != <strong>null</strong>) {
<a name="642" href="#642">642</a>             feedDoc.getRootElement().setAttribute(<span class="string">"base"</span>, baseURI, Namespace.XML_NAMESPACE);
<a name="643" href="#643">643</a>         }
<a name="644" href="#644">644</a>         
<a name="645" href="#645">645</a>         <a href="../../../../../com/sun/syndication/io/WireFeedInput.html">WireFeedInput</a> input = <strong>new</strong> <a href="../../../../../com/sun/syndication/io/WireFeedInput.html">WireFeedInput</a>();
<a name="646" href="#646">646</a>         <a href="../../../../../com/sun/syndication/feed/atom/Feed.html">Feed</a> parsedFeed = (Feed)input.build(feedDoc);
<a name="647" href="#647">647</a>         <strong>return</strong> (Entry)parsedFeed.getEntries().get(0);
<a name="648" href="#648">648</a>     } 
<a name="649" href="#649">649</a> }
<a name="650" href="#650">650</a> 
<a name="651" href="#651">651</a> 
</pre>
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