arcwriter.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="328" href="#328">328</a>         <strong>for</strong> (Iterator i = <strong>this</strong>.metadata.iterator();
<a name="329" href="#329">329</a>                 i.hasNext();) {
<a name="330" href="#330">330</a>             Object obj = i.next();
<a name="331" href="#331">331</a>             <strong>if</strong> (obj instanceof String) {
<a name="332" href="#332">332</a>                 baos.write(((String)obj).getBytes(DEFAULT_ENCODING));
<a name="333" href="#333">333</a>             } <strong>else</strong> <strong>if</strong> (obj instanceof File) {
<a name="334" href="#334">334</a>                 InputStream is = <strong>null</strong>;
<a name="335" href="#335">335</a>                 <strong>try</strong> {
<a name="336" href="#336">336</a>                     is = <strong>new</strong> BufferedInputStream(
<a name="337" href="#337">337</a>                         <strong>new</strong> FileInputStream((File)obj));
<a name="338" href="#338">338</a>                     byte [] buffer = <strong>new</strong> byte[4096];
<a name="339" href="#339">339</a>                     <strong>for</strong> (<strong>int</strong> read = -1; (read = is.read(buffer)) != -1;) {
<a name="340" href="#340">340</a>                         baos.write(buffer, 0, read);
<a name="341" href="#341">341</a>                     }
<a name="342" href="#342">342</a>                 } <strong>finally</strong> {
<a name="343" href="#343">343</a>                     <strong>if</strong> (is != <strong>null</strong>) {
<a name="344" href="#344">344</a>                         is.close();
<a name="345" href="#345">345</a>                     }
<a name="346" href="#346">346</a>                 }
<a name="347" href="#347">347</a>             } <strong>else</strong> <strong>if</strong> (obj != <strong>null</strong>) {
<a name="348" href="#348">348</a>                 logger.severe(<span class="string">"Unsupported metadata type: "</span> + obj);
<a name="349" href="#349">349</a>             }
<a name="350" href="#350">350</a>         }
<a name="351" href="#351">351</a>         <strong>return</strong>;
<a name="352" href="#352">352</a>     }
<a name="353" href="#353">353</a> 
<a name="354" href="#354">354</a>     <em>/**<em>*</em></em>
<a name="355" href="#355">355</a> <em>     * @return Total length of metadata.</em>
<a name="356" href="#356">356</a> <em>     * @throws UnsupportedEncodingException</em>
<a name="357" href="#357">357</a> <em>     */</em>
<a name="358" href="#358">358</a>     <strong>private</strong> <strong>int</strong> getMetadataLength()
<a name="359" href="#359">359</a>     throws UnsupportedEncodingException {
<a name="360" href="#360">360</a>         <strong>int</strong> result = -1;
<a name="361" href="#361">361</a>         <strong>if</strong> (<strong>this</strong>.metadata == <strong>null</strong>) {
<a name="362" href="#362">362</a>             result = 0;
<a name="363" href="#363">363</a>         } <strong>else</strong> {
<a name="364" href="#364">364</a>             <strong>for</strong> (Iterator i = <strong>this</strong>.metadata.iterator();
<a name="365" href="#365">365</a>                     i.hasNext();) {
<a name="366" href="#366">366</a>                 Object obj = i.next();
<a name="367" href="#367">367</a>                 <strong>if</strong> (obj instanceof String) {
<a name="368" href="#368">368</a>                     result += ((String)obj).getBytes(DEFAULT_ENCODING).length;
<a name="369" href="#369">369</a>                 } <strong>else</strong> <strong>if</strong> (obj instanceof File) {
<a name="370" href="#370">370</a>                     result += ((File)obj).length();
<a name="371" href="#371">371</a>                 } <strong>else</strong> {
<a name="372" href="#372">372</a>                     logger.severe(<span class="string">"Unsupported metadata type: "</span> + obj);
<a name="373" href="#373">373</a>                 }
<a name="374" href="#374">374</a>             }
<a name="375" href="#375">375</a>         }
<a name="376" href="#376">376</a>         <strong>return</strong> result;
<a name="377" href="#377">377</a>     }
<a name="378" href="#378">378</a> 
<a name="379" href="#379">379</a>     <strong>public</strong> <strong>void</strong> write(String uri, String contentType, String hostIP,
<a name="380" href="#380">380</a>             <strong>long</strong> fetchBeginTimeStamp, <strong>int</strong> recordLength,
<a name="381" href="#381">381</a>             ByteArrayOutputStream baos)
<a name="382" href="#382">382</a>     throws IOException {
<a name="383" href="#383">383</a>         preWriteRecordTasks();
<a name="384" href="#384">384</a>         <strong>try</strong> {
<a name="385" href="#385">385</a>             write(getMetaLine(uri, contentType, hostIP,
<a name="386" href="#386">386</a>                 fetchBeginTimeStamp, recordLength).getBytes(UTF8));
<a name="387" href="#387">387</a>             baos.writeTo(getOutputStream());
<a name="388" href="#388">388</a>             write(LINE_SEPARATOR);
<a name="389" href="#389">389</a>         } <strong>finally</strong> {
<a name="390" href="#390">390</a>             postWriteRecordTasks();
<a name="391" href="#391">391</a>         }
<a name="392" href="#392">392</a>     }
<a name="393" href="#393">393</a> 
<a name="394" href="#394">394</a>     <strong>public</strong> <strong>void</strong> write(String uri, String contentType, String hostIP,
<a name="395" href="#395">395</a>             <strong>long</strong> fetchBeginTimeStamp, <strong>int</strong> recordLength, InputStream in)
<a name="396" href="#396">396</a>     throws IOException {
<a name="397" href="#397">397</a>         preWriteRecordTasks();
<a name="398" href="#398">398</a>         <strong>try</strong> {
<a name="399" href="#399">399</a>             write(getMetaLine(uri, contentType, hostIP,
<a name="400" href="#400">400</a>                     fetchBeginTimeStamp, recordLength).getBytes(UTF8));
<a name="401" href="#401">401</a>             readFullyFrom(in, recordLength, <strong>this</strong>.readbuffer);
<a name="402" href="#402">402</a>             write(LINE_SEPARATOR);
<a name="403" href="#403">403</a>         } <strong>finally</strong> {
<a name="404" href="#404">404</a>             postWriteRecordTasks();
<a name="405" href="#405">405</a>         }
<a name="406" href="#406">406</a>     }
<a name="407" href="#407">407</a> 
<a name="408" href="#408">408</a>     <strong>public</strong> <strong>void</strong> write(String uri, String contentType, String hostIP,
<a name="409" href="#409">409</a>             <strong>long</strong> fetchBeginTimeStamp, <strong>int</strong> recordLength,
<a name="410" href="#410">410</a>             <a href="../../../../org/archive/io/ReplayInputStream.html">ReplayInputStream</a> ris)
<a name="411" href="#411">411</a>     throws IOException {
<a name="412" href="#412">412</a>         preWriteRecordTasks();
<a name="413" href="#413">413</a>         <strong>try</strong> {
<a name="414" href="#414">414</a>             write(getMetaLine(uri, contentType, hostIP,
<a name="415" href="#415">415</a>                     fetchBeginTimeStamp, recordLength).getBytes(UTF8));
<a name="416" href="#416">416</a>             <strong>try</strong> {
<a name="417" href="#417">417</a>                 ris.readFullyTo(getOutputStream());
<a name="418" href="#418">418</a>                 <strong>long</strong> remaining = ris.remaining();
<a name="419" href="#419">419</a>                 <em class="comment">// Should be zero at this stage.  If not, something is</em>
<a name="420" href="#420">420</a>                 <em class="comment">// wrong.</em>
<a name="421" href="#421">421</a>                 <strong>if</strong> (remaining != 0) {
<a name="422" href="#422">422</a>                     String message = <span class="string">"Gap between expected and actual: "</span> +
<a name="423" href="#423">423</a>                         remaining + LINE_SEPARATOR + DevUtils.extraInfo() +
<a name="424" href="#424">424</a>                         <span class="string">" writing arc "</span> + <strong>this</strong>.getFile().getAbsolutePath();
<a name="425" href="#425">425</a>                     DevUtils.warnHandle(<strong>new</strong> Throwable(message), message);
<a name="426" href="#426">426</a>                     <strong>throw</strong> <strong>new</strong> IOException(message);
<a name="427" href="#427">427</a>                 }
<a name="428" href="#428">428</a>             } <strong>finally</strong> {
<a name="429" href="#429">429</a>                 ris.close();
<a name="430" href="#430">430</a>             } 
<a name="431" href="#431">431</a>             
<a name="432" href="#432">432</a>             <em class="comment">// Write out trailing newline</em>
<a name="433" href="#433">433</a>             write(LINE_SEPARATOR);
<a name="434" href="#434">434</a>         } <strong>finally</strong> {
<a name="435" href="#435">435</a>             postWriteRecordTasks();
<a name="436" href="#436">436</a>         }
<a name="437" href="#437">437</a>     }
<a name="438" href="#438">438</a>     
<a name="439" href="#439">439</a>     <em>/**<em>*</em></em>
<a name="440" href="#440">440</a> <em>     * @param uri</em>
<a name="441" href="#441">441</a> <em>     * @param contentType</em>
<a name="442" href="#442">442</a> <em>     * @param hostIP</em>
<a name="443" href="#443">443</a> <em>     * @param fetchBeginTimeStamp</em>
<a name="444" href="#444">444</a> <em>     * @param recordLength</em>
<a name="445" href="#445">445</a> <em>     * @return Metadata line for an ARCRecord made of passed components.</em>
<a name="446" href="#446">446</a> <em>     * @exception IOException</em>
<a name="447" href="#447">447</a> <em>     */</em>
<a name="448" href="#448">448</a>     <strong>protected</strong> String getMetaLine(String uri, String contentType, String hostIP,
<a name="449" href="#449">449</a>         <strong>long</strong> fetchBeginTimeStamp, <strong>int</strong> recordLength)
<a name="450" href="#450">450</a>     throws IOException {
<a name="451" href="#451">451</a>         <strong>if</strong> (fetchBeginTimeStamp &lt;= 0) {
<a name="452" href="#452">452</a>             <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Bogus fetchBeginTimestamp: "</span> +
<a name="453" href="#453">453</a>                 Long.toString(fetchBeginTimeStamp));
<a name="454" href="#454">454</a>         }
<a name="455" href="#455">455</a> 
<a name="456" href="#456">456</a>         <strong>return</strong> validateMetaLine(createMetaline(uri, hostIP, 
<a name="457" href="#457">457</a>             ArchiveUtils.get14DigitDate(fetchBeginTimeStamp),
<a name="458" href="#458">458</a>             MimetypeUtils.truncate(contentType),
<a name="459" href="#459">459</a>             Integer.toString(recordLength)));
<a name="460" href="#460">460</a>     }
<a name="461" href="#461">461</a>     
<a name="462" href="#462">462</a>     <strong>public</strong> String createMetaline(String uri, String hostIP,
<a name="463" href="#463">463</a>             String timeStamp, String mimetype, String recordLength) {
<a name="464" href="#464">464</a>         <strong>return</strong> uri + HEADER_FIELD_SEPARATOR + hostIP +
<a name="465" href="#465">465</a>             HEADER_FIELD_SEPARATOR + timeStamp +
<a name="466" href="#466">466</a>             HEADER_FIELD_SEPARATOR + mimetype +
<a name="467" href="#467">467</a>             HEADER_FIELD_SEPARATOR + recordLength + LINE_SEPARATOR;
<a name="468" href="#468">468</a>     }
<a name="469" href="#469">469</a>     
<a name="470" href="#470">470</a>     <em>/**<em>*</em></em>
<a name="471" href="#471">471</a> <em>     * Test that the metadata line is valid before writing.</em>
<a name="472" href="#472">472</a> <em>     * @param metaLineStr</em>
<a name="473" href="#473">473</a> <em>     * @throws IOException</em>
<a name="474" href="#474">474</a> <em>     * @return The passed in metaline.</em>
<a name="475" href="#475">475</a> <em>     */</em>
<a name="476" href="#476">476</a>     <strong>protected</strong> String validateMetaLine(String metaLineStr)
<a name="477" href="#477">477</a>     throws IOException {
<a name="478" href="#478">478</a>         <strong>if</strong> (metaLineStr.length() > MAX_METADATA_LINE_LENGTH) {
<a name="479" href="#479">479</a>         	<strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Metadata line length is "</span> +
<a name="480" href="#480">480</a>                 metaLineStr.length() + <span class="string">" which is > than maximum "</span> +
<a name="481" href="#481">481</a>                 MAX_METADATA_LINE_LENGTH);
<a name="482" href="#482">482</a>         }
<a name="483" href="#483">483</a>      	Matcher m = METADATA_LINE_PATTERN.matcher(metaLineStr);
<a name="484" href="#484">484</a>         <strong>if</strong> (!m.matches()) {
<a name="485" href="#485">485</a>             <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Metadata line doesn't match expected"</span> +
<a name="486" href="#486">486</a>                 <span class="string">" pattern: "</span> + metaLineStr);
<a name="487" href="#487">487</a>         }
<a name="488" href="#488">488</a>         <strong>return</strong> metaLineStr;
<a name="489" href="#489">489</a>     }
<a name="490" href="#490">490</a> }
</pre>
<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
</html>