arcreader.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="282" href="#282">282</a>             <strong>if</strong> (c == LINE_SEPARATOR) {
<a name="283" href="#283">283</a>                 <strong>if</strong> (buffer.length() == 0) {
<a name="284" href="#284">284</a>                     <em class="comment">// Empty line at start of buffer.  Skip it and try again.</em>
<a name="285" href="#285">285</a>                     <strong>continue</strong>;
<a name="286" href="#286">286</a>                 }
<a name="287" href="#287">287</a> 
<a name="288" href="#288">288</a>                 <strong>if</strong> (list != <strong>null</strong>) {
<a name="289" href="#289">289</a>                     list.add(buffer.toString());
<a name="290" href="#290">290</a>                 }
<a name="291" href="#291">291</a>                 <em class="comment">// LOOP TERMINATION.</em>
<a name="292" href="#292">292</a>                 <strong>break</strong>;
<a name="293" href="#293">293</a>             } <strong>else</strong> <strong>if</strong> (c == HEADER_FIELD_SEPARATOR) {
<a name="294" href="#294">294</a>                 <strong>if</strong> (list != <strong>null</strong>) {
<a name="295" href="#295">295</a>                     list.add(buffer.toString());
<a name="296" href="#296">296</a>                 }
<a name="297" href="#297">297</a>                 buffer = <strong>new</strong> StringBuffer();
<a name="298" href="#298">298</a>             } <strong>else</strong> {
<a name="299" href="#299">299</a>                 buffer.append((<strong>char</strong>)c);
<a name="300" href="#300">300</a>             }
<a name="301" href="#301">301</a>         }
<a name="302" href="#302">302</a> 
<a name="303" href="#303">303</a>         <em class="comment">// List must have at least 3 elements in it and no more than 10.  If</em>
<a name="304" href="#304">304</a>         <em class="comment">// it has other than this, then bogus parse.</em>
<a name="305" href="#305">305</a>         <strong>if</strong> (list != <strong>null</strong> &amp;&amp; (list.size() &lt; 3 || list.size() > 100)) {
<a name="306" href="#306">306</a>             <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Unparseable header line: "</span> + list);
<a name="307" href="#307">307</a>         }
<a name="308" href="#308">308</a> 
<a name="309" href="#309">309</a>         <strong>return</strong> read;
<a name="310" href="#310">310</a>     }
<a name="311" href="#311">311</a> 
<a name="312" href="#312">312</a>     <em>/**<em>*</em></em>
<a name="313" href="#313">313</a> <em>     * Compute metadata fields.</em>
<a name="314" href="#314">314</a> <em>     *</em>
<a name="315" href="#315">315</a> <em>     * Here we check the meta field has right number of items in it.</em>
<a name="316" href="#316">316</a> <em>     *</em>
<a name="317" href="#317">317</a> <em>     * @param keys Keys to use composing headerFields map.</em>
<a name="318" href="#318">318</a> <em>     * @param values Values to set into the headerFields map.</em>
<a name="319" href="#319">319</a> <em>     * @param v The version of this ARC file.</em>
<a name="320" href="#320">320</a> <em>     * @param offset Offset into arc file.</em>
<a name="321" href="#321">321</a> <em>     *</em>
<a name="322" href="#322">322</a> <em>     * @return Metadata structure for this record.</em>
<a name="323" href="#323">323</a> <em>     *</em>
<a name="324" href="#324">324</a> <em>     * @exception IOException  If no. of keys doesn't match no. of values.</em>
<a name="325" href="#325">325</a> <em>     */</em>
<a name="326" href="#326">326</a>     <strong>private</strong> <a href="../../../../org/archive/io/arc/ARCRecordMetaData.html">ARCRecordMetaData</a> computeMetaData(List&lt;String> keys,
<a name="327" href="#327">327</a>     		List&lt;String> values, String v, <strong>long</strong> offset)
<a name="328" href="#328">328</a>     throws IOException {
<a name="329" href="#329">329</a>         <strong>if</strong> (keys.size() != values.size()) {
<a name="330" href="#330">330</a>             List&lt;String> originalValues = values;
<a name="331" href="#331">331</a>             <strong>if</strong> (!isStrict()) {
<a name="332" href="#332">332</a>                 values = fixSpaceInMetadataLine(values, keys.size());
<a name="333" href="#333">333</a>             }
<a name="334" href="#334">334</a>             <strong>if</strong> (keys.size() != values.size()) {
<a name="335" href="#335">335</a>                 <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Size of field name keys does"</span> +
<a name="336" href="#336">336</a>                     <span class="string">" not match count of field values: "</span> + values);
<a name="337" href="#337">337</a>             }
<a name="338" href="#338">338</a>             <em class="comment">// Note that field was fixed on stderr.</em>
<a name="339" href="#339">339</a>             logStdErr(Level.WARNING, <span class="string">"Fixed spaces in metadata URL."</span> +
<a name="340" href="#340">340</a>                 <span class="string">" Original: "</span> + originalValues + <span class="string">", New: "</span> + values);
<a name="341" href="#341">341</a>         }
<a name="342" href="#342">342</a>         
<a name="343" href="#343">343</a>         Map&lt;Object, Object> headerFields =
<a name="344" href="#344">344</a>         	<strong>new</strong> HashMap&lt;Object, Object>(keys.size() + 2);
<a name="345" href="#345">345</a>         <strong>for</strong> (<strong>int</strong> i = 0; i &lt; keys.size(); i++) {
<a name="346" href="#346">346</a>             headerFields.put(keys.get(i), values.get(i));
<a name="347" href="#347">347</a>         }
<a name="348" href="#348">348</a>         
<a name="349" href="#349">349</a>         <em class="comment">// Add a check for tabs in URLs.  If any, replace with '%09'.</em>
<a name="350" href="#350">350</a>         <em class="comment">// See https://sourceforge.net/tracker/?group_id=73833&amp;atid=539099&amp;func=detail&amp;aid=1010966,</em>
<a name="351" href="#351">351</a>         <em class="comment">// [ 1010966 ] crawl.log has URIs with spaces in them.</em>
<a name="352" href="#352">352</a>         String url = (String)headerFields.get(URL_FIELD_KEY);
<a name="353" href="#353">353</a>         <strong>if</strong> (url != <strong>null</strong> &amp;&amp; url.indexOf('\t') >= 0) {
<a name="354" href="#354">354</a>             headerFields.put(URL_FIELD_KEY,
<a name="355" href="#355">355</a>                 TextUtils.replaceAll(<span class="string">"\t"</span>, url, <span class="string">"%09"</span>));
<a name="356" href="#356">356</a>         }
<a name="357" href="#357">357</a> 
<a name="358" href="#358">358</a>         headerFields.put(VERSION_FIELD_KEY, v);
<a name="359" href="#359">359</a>         headerFields.put(ABSOLUTE_OFFSET_KEY, <strong>new</strong>  Long(offset));
<a name="360" href="#360">360</a> 
<a name="361" href="#361">361</a>         <strong>return</strong> <strong>new</strong> <a href="../../../../org/archive/io/arc/ARCRecordMetaData.html">ARCRecordMetaData</a>(getReaderIdentifier(), headerFields);
<a name="362" href="#362">362</a>     }
<a name="363" href="#363">363</a>     
<a name="364" href="#364">364</a>     <em>/**<em>*</em></em>
<a name="365" href="#365">365</a> <em>     * Fix space in URLs.</em>
<a name="366" href="#366">366</a> <em>     * The ARCWriter used to write into the ARC URLs with spaces in them.</em>
<a name="367" href="#367">367</a> <em>     * See &lt;a</em>
<a name="368" href="#368">368</a> <em>     * href="https://sourceforge.net/tracker/?group_id=73833&amp;atid=539099&amp;func=detail&amp;aid=1010966">[ 1010966 ]</em>
<a name="369" href="#369">369</a> <em>     * crawl.log has URIs with spaces in them&lt;/a>.</em>
<a name="370" href="#370">370</a> <em>     * This method does fix up on such headers converting all spaces found</em>
<a name="371" href="#371">371</a> <em>     * to '%20'.</em>
<a name="372" href="#372">372</a> <em>     * @param values List of metadata values.</em>
<a name="373" href="#373">373</a> <em>     * @param requiredSize Expected size of resultant values list.</em>
<a name="374" href="#374">374</a> <em>     * @return New list if we successfully fixed up values or original if</em>
<a name="375" href="#375">375</a> <em>     * fixup failed.</em>
<a name="376" href="#376">376</a> <em>     */</em>
<a name="377" href="#377">377</a>     <strong>protected</strong> List&lt;String> fixSpaceInMetadataLine(List&lt;String> values,
<a name="378" href="#378">378</a>     		<strong>int</strong> requiredSize) {
<a name="379" href="#379">379</a>         <em class="comment">// Do validity check. 3rd from last is a date of 14 numeric</em>
<a name="380" href="#380">380</a>         <em class="comment">// characters.  The 4th from last is IP, all before the IP</em>
<a name="381" href="#381">381</a>         <em class="comment">// should be concatenated together with a '%20' joiner.</em>
<a name="382" href="#382">382</a>         <em class="comment">// In the below, '4' is 4th field from end which has the IP.</em>
<a name="383" href="#383">383</a>         <strong>if</strong> (!(values.size() > requiredSize) || values.size() &lt; 4) {
<a name="384" href="#384">384</a>             <strong>return</strong> values;
<a name="385" href="#385">385</a>         }
<a name="386" href="#386">386</a>         <em class="comment">// Test 3rd field is valid date.</em>
<a name="387" href="#387">387</a>         String date = (String)values.get(values.size() - 3);
<a name="388" href="#388">388</a>         <strong>if</strong> (date.length() != 14) {
<a name="389" href="#389">389</a>             <strong>return</strong> values;
<a name="390" href="#390">390</a>         }
<a name="391" href="#391">391</a>         <strong>for</strong> (<strong>int</strong> i = 0; i &lt; date.length(); i++) {
<a name="392" href="#392">392</a>             <strong>if</strong> (!Character.isDigit(date.charAt(i))) {
<a name="393" href="#393">393</a>                 <strong>return</strong> values;
<a name="394" href="#394">394</a>             }
<a name="395" href="#395">395</a>         }
<a name="396" href="#396">396</a>         <em class="comment">// Test 4th field is valid IP.</em>
<a name="397" href="#397">397</a>         String ip = (String)values.get(values.size() - 4);
<a name="398" href="#398">398</a>         Matcher m = InetAddressUtil.IPV4_QUADS.matcher(ip);
<a name="399" href="#399">399</a>         <strong>if</strong> (ip == <span class="string">"-"</span> || m.matches()) {
<a name="400" href="#400">400</a>             List&lt;String> <strong>new</strong>Values = <strong>new</strong> ArrayList&lt;String>(requiredSize);
<a name="401" href="#401">401</a>             StringBuffer url = <strong>new</strong> StringBuffer();
<a name="402" href="#402">402</a>             <strong>for</strong> (<strong>int</strong> i = 0; i &lt; (values.size() - 4); i++) {
<a name="403" href="#403">403</a>                 <strong>if</strong> (i > 0) {
<a name="404" href="#404">404</a>                     url.append(<span class="string">"%20"</span>);
<a name="405" href="#405">405</a>                 }
<a name="406" href="#406">406</a>                 url.append(values.get(i));
<a name="407" href="#407">407</a>             } 
<a name="408" href="#408">408</a>             newValues.add(url.toString());
<a name="409" href="#409">409</a>             <strong>for</strong> (<strong>int</strong> i = values.size() - 4; i &lt; values.size(); i++) {
<a name="410" href="#410">410</a>                 newValues.add(values.get(i));
<a name="411" href="#411">411</a>             }
<a name="412" href="#412">412</a>             values =  newValues;
<a name="413" href="#413">413</a>         }
<a name="414" href="#414">414</a>         <strong>return</strong> values;
<a name="415" href="#415">415</a>     }
<a name="416" href="#416">416</a>     
<a name="417" href="#417">417</a> 	<strong>protected</strong> <strong>boolean</strong> isAlignedOnFirstRecord() {
<a name="418" href="#418">418</a> 		<strong>return</strong> alignedOnFirstRecord;
<a name="419" href="#419">419</a> 	}
<a name="420" href="#420">420</a> 
<a name="421" href="#421">421</a> 	<strong>protected</strong> <strong>void</strong> setAlignedOnFirstRecord(<strong>boolean</strong> alignedOnFirstRecord) {
<a name="422" href="#422">422</a> 		<strong>this</strong>.alignedOnFirstRecord = alignedOnFirstRecord;
<a name="423" href="#423">423</a> 	}
<a name="424" href="#424">424</a> 	
<a name="425" href="#425">425</a>     <em>/**<em>*</em></em>
<a name="426" href="#426">426</a> <em>     * @return Returns the parseHttpHeaders.</em>