xmlreader.html

来自「rsslibj-1_0RC2,RSS阅读」· HTML 代码 · 共 679 行 · 第 1/4 页

<a name="502" href="#502">502</a> 
<a name="503" href="#503">503</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> Pattern CHARSET_PATTERN = Pattern.compile(<span class="string">"charset=([.[^; ]]*)"</span>);
<a name="504" href="#504">504</a> 
<a name="505" href="#505">505</a>     <em class="comment">// returns charset parameter value, NULL if not present, NULL if httpContentType is NULL</em>
<a name="506" href="#506">506</a>     <strong>private</strong> <strong>static</strong> String getContentTypeEncoding(String httpContentType) {
<a name="507" href="#507">507</a>         String encoding = <strong>null</strong>;
<a name="508" href="#508">508</a>         <strong>if</strong> (httpContentType!=<strong>null</strong>) {
<a name="509" href="#509">509</a>             <strong>int</strong> i = httpContentType.indexOf(<span class="string">";"</span>);
<a name="510" href="#510">510</a>             <strong>if</strong> (i>-1) {
<a name="511" href="#511">511</a>                 String postMime = httpContentType.substring(i+1);
<a name="512" href="#512">512</a>                 Matcher m = CHARSET_PATTERN.matcher(postMime);
<a name="513" href="#513">513</a>                 encoding = (m.find()) ? m.group(1) : <strong>null</strong>;
<a name="514" href="#514">514</a>                 encoding = (encoding!=<strong>null</strong>) ? encoding.toUpperCase() : <strong>null</strong>;
<a name="515" href="#515">515</a>             }
<a name="516" href="#516">516</a>             <strong>if</strong> (encoding != <strong>null</strong> &amp;&amp;
<a name="517" href="#517">517</a>                     ((encoding.startsWith(<span class="string">"\&quot;"</span>) &amp;&amp; encoding.endsWith(<span class="string">"\&quot;"</span>)) ||
<a name="518" href="#518">518</a>                      (encoding.startsWith(<span class="string">"'"</span>) &amp;&amp; encoding.endsWith(<span class="string">"'"</span>))
<a name="519" href="#519">519</a>                     )) {
<a name="520" href="#520">520</a>                 encoding = encoding.substring(1, encoding.length() - 1);
<a name="521" href="#521">521</a>             }
<a name="522" href="#522">522</a>         }
<a name="523" href="#523">523</a>         <strong>return</strong> encoding;
<a name="524" href="#524">524</a>     }
<a name="525" href="#525">525</a> 
<a name="526" href="#526">526</a>     <em class="comment">// returns the BOM in the stream, NULL if not present,</em>
<a name="527" href="#527">527</a>     <em class="comment">// if there was BOM the in the stream it is consumed</em>
<a name="528" href="#528">528</a>     <strong>private</strong> <strong>static</strong> String getBOMEncoding(BufferedInputStream is) throws IOException {
<a name="529" href="#529">529</a>         String encoding = <strong>null</strong>;
<a name="530" href="#530">530</a>         <strong>int</strong>[] bytes = <strong>new</strong> <strong>int</strong>[3];
<a name="531" href="#531">531</a>         is.mark(3);
<a name="532" href="#532">532</a>         bytes[0] = is.read();
<a name="533" href="#533">533</a>         bytes[1] = is.read();
<a name="534" href="#534">534</a>         bytes[2] = is.read();
<a name="535" href="#535">535</a> 
<a name="536" href="#536">536</a>         <strong>if</strong> (bytes[0] == 0xFE &amp;&amp; bytes[1] == 0xFF) {
<a name="537" href="#537">537</a>             encoding = UTF_16BE;
<a name="538" href="#538">538</a>             is.reset();
<a name="539" href="#539">539</a>             is.read();
<a name="540" href="#540">540</a>             is.read();
<a name="541" href="#541">541</a>         }
<a name="542" href="#542">542</a>         <strong>else</strong>
<a name="543" href="#543">543</a>         <strong>if</strong> (bytes[0] == 0xFF &amp;&amp; bytes[1] == 0xFE) {
<a name="544" href="#544">544</a>             encoding = UTF_16LE;
<a name="545" href="#545">545</a>             is.reset();
<a name="546" href="#546">546</a>             is.read();
<a name="547" href="#547">547</a>             is.read();
<a name="548" href="#548">548</a>         }
<a name="549" href="#549">549</a>         <strong>else</strong>
<a name="550" href="#550">550</a>         <strong>if</strong> (bytes[0] == 0xEF &amp;&amp; bytes[1] == 0xBB &amp;&amp; bytes[2] == 0xBF) {
<a name="551" href="#551">551</a>             encoding = UTF_8;
<a name="552" href="#552">552</a>         }
<a name="553" href="#553">553</a>         <strong>else</strong> {
<a name="554" href="#554">554</a>             is.reset();
<a name="555" href="#555">555</a>         }
<a name="556" href="#556">556</a>         <strong>return</strong> encoding;
<a name="557" href="#557">557</a>     }
<a name="558" href="#558">558</a> 
<a name="559" href="#559">559</a>     <em class="comment">// returns the best guess for the encoding by looking the first bytes of the stream, '&lt;?'</em>
<a name="560" href="#560">560</a>     <strong>private</strong> <strong>static</strong> String getXMLGuessEncoding(BufferedInputStream is) throws IOException {
<a name="561" href="#561">561</a>         String encoding = <strong>null</strong>;
<a name="562" href="#562">562</a>         <strong>int</strong>[] bytes = <strong>new</strong> <strong>int</strong>[4];
<a name="563" href="#563">563</a>         is.mark(4);
<a name="564" href="#564">564</a>         bytes[0] = is.read();
<a name="565" href="#565">565</a>         bytes[1] = is.read();
<a name="566" href="#566">566</a>         bytes[2] = is.read();
<a name="567" href="#567">567</a>         bytes[3] = is.read();
<a name="568" href="#568">568</a>         is.reset();
<a name="569" href="#569">569</a> 
<a name="570" href="#570">570</a>         <strong>if</strong> (bytes[0] == 0x00 &amp;&amp; bytes[1] == 0x3C &amp;&amp; bytes[2] == 0x00 &amp;&amp; bytes[3] == 0x3F) {
<a name="571" href="#571">571</a>                 encoding = UTF_16BE;
<a name="572" href="#572">572</a>         }
<a name="573" href="#573">573</a>         <strong>else</strong>
<a name="574" href="#574">574</a>         <strong>if</strong> (bytes[0] == 0x3C &amp;&amp; bytes[1] == 0x00 &amp;&amp; bytes[2] == 0x3F &amp;&amp; bytes[3] == 0x00) {
<a name="575" href="#575">575</a>                 encoding = UTF_16LE;
<a name="576" href="#576">576</a>         }
<a name="577" href="#577">577</a>         <strong>else</strong>
<a name="578" href="#578">578</a>         <strong>if</strong> (bytes[0] == 0x3C &amp;&amp; bytes[1] == 0x3F &amp;&amp; bytes[2] == 0x78 &amp;&amp; bytes[3] == 0x6D) {
<a name="579" href="#579">579</a>             encoding = UTF_8;
<a name="580" href="#580">580</a>         }
<a name="581" href="#581">581</a>         <strong>return</strong> encoding;
<a name="582" href="#582">582</a>     }
<a name="583" href="#583">583</a> 
<a name="584" href="#584">584</a> 
<a name="585" href="#585">585</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> Pattern ENCODING_PATTERN =
<a name="586" href="#586">586</a>         Pattern.compile(<span class="string">"&lt;&#47;&#47;?xml.*encoding[&#47;&#47;s]*=[&#47;&#47;s]*((?:\&quot;.[^\&quot;]*\&quot;)|(?:'.[^']*'))"</span>, Pattern.MULTILINE);
<a name="587" href="#587">587</a> 
<a name="588" href="#588">588</a>     <em class="comment">// returns the encoding declared in the &lt;?xml encoding=...?>,  NULL if none</em>
<a name="589" href="#589">589</a>     <strong>private</strong> <strong>static</strong> String getXmlProlog(BufferedInputStream is,String guessedEnc) throws IOException {
<a name="590" href="#590">590</a>         String encoding = <strong>null</strong>;
<a name="591" href="#591">591</a>         <strong>if</strong> (guessedEnc!=<strong>null</strong>) {
<a name="592" href="#592">592</a>             byte[] bytes = <strong>new</strong> byte[BUFFER_SIZE];
<a name="593" href="#593">593</a>             is.mark(BUFFER_SIZE);
<a name="594" href="#594">594</a>             <strong>int</strong> offset = 0;
<a name="595" href="#595">595</a>             <strong>int</strong> max = BUFFER_SIZE;
<a name="596" href="#596">596</a>             <strong>int</strong> c = is.read(bytes,offset,max);
<a name="597" href="#597">597</a>             <strong>int</strong> firstGT = -1;
<a name="598" href="#598">598</a>             <strong>while</strong> (c!=-1 &amp;&amp; firstGT==-1 &amp;&amp; offset&lt; BUFFER_SIZE) {
<a name="599" href="#599">599</a>                 offset += c;
<a name="600" href="#600">600</a>                 max -= c;
<a name="601" href="#601">601</a>                 c = is.read(bytes,offset,max);
<a name="602" href="#602">602</a>                 firstGT = <strong>new</strong> String(bytes, 0, offset).indexOf(<span class="string">">"</span>);
<a name="603" href="#603">603</a>             }
<a name="604" href="#604">604</a>             <strong>if</strong> (firstGT == -1) {
<a name="605" href="#605">605</a>                 <strong>if</strong> (c == -1) {
<a name="606" href="#606">606</a>                     <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Unexpected end of XML stream"</span>);
<a name="607" href="#607">607</a>                 }
<a name="608" href="#608">608</a>                 <strong>else</strong> {
<a name="609" href="#609">609</a>                     <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"XML prolog or ROOT element not found on first "</span> + offset + <span class="string">" bytes"</span>);
<a name="610" href="#610">610</a>                 }
<a name="611" href="#611">611</a>             }
<a name="612" href="#612">612</a>             <strong>int</strong> bytesRead = offset;
<a name="613" href="#613">613</a>             <strong>if</strong> (bytesRead>0) {
<a name="614" href="#614">614</a>                 is.reset();
<a name="615" href="#615">615</a>                 Reader reader = <strong>new</strong> InputStreamReader(<strong>new</strong> ByteArrayInputStream(bytes,0,firstGT + 1), guessedEnc);
<a name="616" href="#616">616</a>                 BufferedReader bReader = <strong>new</strong> BufferedReader(reader);
<a name="617" href="#617">617</a>                 StringBuffer prolog = <strong>new</strong> StringBuffer();
<a name="618" href="#618">618</a>                 String line = bReader.readLine();
<a name="619" href="#619">619</a>                 <strong>while</strong> (line != <strong>null</strong>) {
<a name="620" href="#620">620</a>                     prolog.append(line);
<a name="621" href="#621">621</a>                     line = bReader.readLine();
<a name="622" href="#622">622</a>                 }
<a name="623" href="#623">623</a>                 Matcher m = ENCODING_PATTERN.matcher(prolog);
<a name="624" href="#624">624</a>                 <strong>if</strong> (m.find()) {
<a name="625" href="#625">625</a>                     encoding = m.group(1).toUpperCase();
<a name="626" href="#626">626</a>                     encoding = encoding.substring(1,encoding.length()-1);
<a name="627" href="#627">627</a>                 }
<a name="628" href="#628">628</a>             }
<a name="629" href="#629">629</a>         }
<a name="630" href="#630">630</a>         <strong>return</strong> encoding;
<a name="631" href="#631">631</a>     }
<a name="632" href="#632">632</a> 
<a name="633" href="#633">633</a>     <em class="comment">// indicates if the MIME type belongs to the APPLICATION XML family</em>
<a name="634" href="#634">634</a>     <strong>private</strong> <strong>static</strong> <strong>boolean</strong> isAppXml(String mime) {
<a name="635" href="#635">635</a>         <strong>return</strong> mime!=<strong>null</strong> &amp;&amp;
<a name="636" href="#636">636</a>                (mime.equals(<span class="string">"application/xml"</span>) ||
<a name="637" href="#637">637</a>                 mime.equals(<span class="string">"application/xml-dtd"</span>) ||
<a name="638" href="#638">638</a>                 mime.equals(<span class="string">"application/xml-external-parsed-entity"</span>) ||
<a name="639" href="#639">639</a>                 (mime.startsWith(<span class="string">"application/"</span>) &amp;&amp; mime.endsWith(<span class="string">"+xml"</span>)));
<a name="640" href="#640">640</a>     }
<a name="641" href="#641">641</a> 
<a name="642" href="#642">642</a>     <em class="comment">// indicates if the MIME type belongs to the TEXT XML family</em>
<a name="643" href="#643">643</a>     <strong>private</strong> <strong>static</strong> <strong>boolean</strong> isTextXml(String mime) {
<a name="644" href="#644">644</a>         <strong>return</strong> mime!=<strong>null</strong> &amp;&amp;
<a name="645" href="#645">645</a>                (mime.equals(<span class="string">"text/xml"</span>) ||
<a name="646" href="#646">646</a>                 mime.equals(<span class="string">"text/xml-external-parsed-entity"</span>) ||
<a name="647" href="#647">647</a>                 (mime.startsWith(<span class="string">"text/"</span>) &amp;&amp; mime.endsWith(<span class="string">"+xml"</span>)));
<a name="648" href="#648">648</a>     }
<a name="649" href="#649">649</a> 
<a name="650" href="#650">650</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MessageFormat RAW_EX_1 = <strong>new</strong> MessageFormat(
<a name="651" href="#651">651</a>             <span class="string">"Invalid encoding, BOM [{0}] XML guess [{1}] XML prolog [{2}] encoding mismatch"</span>);
<a name="652" href="#652">652</a> 
<a name="653" href="#653">653</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MessageFormat RAW_EX_2 = <strong>new</strong> MessageFormat(
<a name="654" href="#654">654</a>             <span class="string">"Invalid encoding, BOM [{0}] XML guess [{1}] XML prolog [{2}] unknown BOM"</span>);
<a name="655" href="#655">655</a> 
<a name="656" href="#656">656</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MessageFormat HTTP_EX_1 = <strong>new</strong> MessageFormat(
<a name="657" href="#657">657</a>             <span class="string">"Invalid encoding, CT-MIME [{0}] CT-Enc [{1}] BOM [{2}] XML guess [{3}] XML prolog [{4}], BOM must be NULL"</span>);
<a name="658" href="#658">658</a> 
<a name="659" href="#659">659</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MessageFormat HTTP_EX_2 = <strong>new</strong> MessageFormat(
<a name="660" href="#660">660</a>             <span class="string">"Invalid encoding, CT-MIME [{0}] CT-Enc [{1}] BOM [{2}] XML guess [{3}] XML prolog [{4}], encoding mismatch"</span>);
<a name="661" href="#661">661</a> 
<a name="662" href="#662">662</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MessageFormat HTTP_EX_3 = <strong>new</strong> MessageFormat(
<a name="663" href="#663">663</a>             <span class="string">"Invalid encoding, CT-MIME [{0}] CT-Enc [{1}] BOM [{2}] XML guess [{3}] XML prolog [{4}], Invalid MIME"</span>);
<a name="664" href="#664">664</a> 
<a name="665" href="#665">665</a> }
</pre>
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