settingshandler.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="418" href="#418">418</a>             throws InvocationTargetException {
<a name="419" href="#419">419</a> 
<a name="420" href="#420">420</a>         Class cl;
<a name="421" href="#421">421</a>         <strong>try</strong> {
<a name="422" href="#422">422</a>             cl = Class.forName(className);
<a name="423" href="#423">423</a>         } <strong>catch</strong> (ClassNotFoundException e) {
<a name="424" href="#424">424</a>             <strong>throw</strong> <strong>new</strong> InvocationTargetException(e);
<a name="425" href="#425">425</a>         }
<a name="426" href="#426">426</a> 
<a name="427" href="#427">427</a>         <a href="../../../../org/archive/crawler/settings/ModuleType.html">ModuleType</a> module;
<a name="428" href="#428">428</a>         <strong>try</strong> {
<a name="429" href="#429">429</a>             Constructor co =
<a name="430" href="#430">430</a>                 cl.getConstructor(<strong>new</strong> Class[] { String.<strong>class</strong> });
<a name="431" href="#431">431</a>             module = (ModuleType) co.<strong>new</strong>Instance(<strong>new</strong> Object[] { name });
<a name="432" href="#432">432</a>         } <strong>catch</strong> (IllegalArgumentException e) {
<a name="433" href="#433">433</a>             <strong>throw</strong> <strong>new</strong> InvocationTargetException(e);
<a name="434" href="#434">434</a>         } <strong>catch</strong> (InstantiationException e) {
<a name="435" href="#435">435</a>             <strong>throw</strong> <strong>new</strong> InvocationTargetException(e);
<a name="436" href="#436">436</a>         } <strong>catch</strong> (IllegalAccessException e) {
<a name="437" href="#437">437</a>             <strong>throw</strong> <strong>new</strong> InvocationTargetException(e);
<a name="438" href="#438">438</a>         } <strong>catch</strong> (SecurityException e) {
<a name="439" href="#439">439</a>             <strong>throw</strong> <strong>new</strong> InvocationTargetException(e);
<a name="440" href="#440">440</a>         } <strong>catch</strong> (NoSuchMethodException e) {
<a name="441" href="#441">441</a>             <strong>throw</strong> <strong>new</strong> InvocationTargetException(e);
<a name="442" href="#442">442</a>         }
<a name="443" href="#443">443</a>         <strong>return</strong> module;
<a name="444" href="#444">444</a>     }
<a name="445" href="#445">445</a> 
<a name="446" href="#446">446</a>     <em>/**<em>*</em></em>
<a name="447" href="#447">447</a> <em>     * Transforms a relative path so that it is relative to a location that is</em>
<a name="448" href="#448">448</a> <em>     * regarded as a working dir for these settings. If an absolute path is given,</em>
<a name="449" href="#449">449</a> <em>     * it will be returned unchanged.</em>
<a name="450" href="#450">450</a> <em>     * @param path A relative path to a file (or directory)</em>
<a name="451" href="#451">451</a> <em>     * @return The same path modified so that it is relative to the file level</em>
<a name="452" href="#452">452</a> <em>     *         location that is considered the working directory for these settings.</em>
<a name="453" href="#453">453</a> <em>     */</em>
<a name="454" href="#454">454</a>     <strong>public</strong> <strong>abstract</strong> File getPathRelativeToWorkingDirectory(String path);
<a name="455" href="#455">455</a> 
<a name="456" href="#456">456</a>     <em>/**<em>*</em></em>
<a name="457" href="#457">457</a> <em>     * Will return a Collection of strings with domains that contain 'per'</em>
<a name="458" href="#458">458</a> <em>     * domain overrides (or their subdomains contain them). </em>
<a name="459" href="#459">459</a> <em>     * </em>
<a name="460" href="#460">460</a> <em>     * The domains considered are</em>
<a name="461" href="#461">461</a> <em>     * limited to those that are subdomains of the supplied domain. If null or</em>
<a name="462" href="#462">462</a> <em>     * empty string is supplied the TLDs will be considered.</em>
<a name="463" href="#463">463</a> <em>     * @param rootDomain The domain to get domain overrides for. Examples:</em>
<a name="464" href="#464">464</a> <em>     *                   'org', 'archive.org', 'crawler.archive.org' etc.</em>
<a name="465" href="#465">465</a> <em>     * @return An array of domains that contain overrides. If rootDomain does not</em>
<a name="466" href="#466">466</a> <em>     *         exist an empty array will be returned.</em>
<a name="467" href="#467">467</a> <em>     */</em>
<a name="468" href="#468">468</a>     <strong>public</strong> <strong>abstract</strong> Collection getDomainOverrides(String rootDomain);
<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>     * Unregister an instance of {@link ValueErrorHandler}.</em>
<a name="472" href="#472">472</a> <em>     *</em>
<a name="473" href="#473">473</a> <em>     * @param errorHandler the &lt;code>CalueErrorHandler&lt;/code> to unregister.</em>
<a name="474" href="#474">474</a> <em>     *</em>
<a name="475" href="#475">475</a> <em>     * @see ValueErrorHandler</em>
<a name="476" href="#476">476</a> <em>     * @see #setErrorReportingLevel(Level)</em>
<a name="477" href="#477">477</a> <em>     * @see #registerValueErrorHandler(ValueErrorHandler)</em>
<a name="478" href="#478">478</a> <em>     *</em>
<a name="479" href="#479">479</a> <em>     */</em>
<a name="480" href="#480">480</a>     <strong>public</strong> <strong>void</strong> unregisterValueErrorHandler(<a href="../../../../org/archive/crawler/settings/ValueErrorHandler.html">ValueErrorHandler</a> errorHandler) {
<a name="481" href="#481">481</a>         valueErrorHandlers.remove(errorHandler);
<a name="482" href="#482">482</a>     }
<a name="483" href="#483">483</a> 
<a name="484" href="#484">484</a>     <em>/**<em>*</em></em>
<a name="485" href="#485">485</a> <em>     * Register an instance of {@link ValueErrorHandler}.</em>
<a name="486" href="#486">486</a> <em>     * &lt;p></em>
<a name="487" href="#487">487</a> <em>     * If a ValueErrorHandler is registered, only constraints with level</em>
<a name="488" href="#488">488</a> <em>     * {@link Level#SEVERE}will throw an {@link InvalidAttributeValueException}.</em>
<a name="489" href="#489">489</a> <em>     * The ValueErrorHandler will recieve a notification for all failed checks</em>
<a name="490" href="#490">490</a> <em>     * with level equal or greater than the error reporting level.</em>
<a name="491" href="#491">491</a> <em>     *</em>
<a name="492" href="#492">492</a> <em>     * @param errorHandler the &lt;code>CalueErrorHandler&lt;/code> to register.</em>
<a name="493" href="#493">493</a> <em>     *</em>
<a name="494" href="#494">494</a> <em>     * @see ValueErrorHandler</em>
<a name="495" href="#495">495</a> <em>     * @see #setErrorReportingLevel(Level)</em>
<a name="496" href="#496">496</a> <em>     * @see #unregisterValueErrorHandler(ValueErrorHandler)</em>
<a name="497" href="#497">497</a> <em>     */</em>
<a name="498" href="#498">498</a>     <strong>public</strong> <strong>void</strong> registerValueErrorHandler(<a href="../../../../org/archive/crawler/settings/ValueErrorHandler.html">ValueErrorHandler</a> errorHandler) {
<a name="499" href="#499">499</a>         <strong>if</strong> (errorHandler != <strong>null</strong>) {
<a name="500" href="#500">500</a>             valueErrorHandlers.add(errorHandler);
<a name="501" href="#501">501</a>         }
<a name="502" href="#502">502</a>     }
<a name="503" href="#503">503</a> 
<a name="504" href="#504">504</a>     <em>/**<em>*</em></em>
<a name="505" href="#505">505</a> <em>     * Fire events on all registered {@link ValueErrorHandler}.</em>
<a name="506" href="#506">506</a> <em>     *</em>
<a name="507" href="#507">507</a> <em>     * @param error the failed constraints return value.</em>
<a name="508" href="#508">508</a> <em>     * @return true if there was any registered ValueErrorHandlers to notify.</em>
<a name="509" href="#509">509</a> <em>     */</em>
<a name="510" href="#510">510</a>     <strong>boolean</strong> fireValueErrorHandlers(Constraint.FailedCheck error) {
<a name="511" href="#511">511</a>         <strong>if</strong> (error.getLevel().intValue() >= errorReportingLevel) {
<a name="512" href="#512">512</a>             <strong>for</strong> (Iterator it = valueErrorHandlers.iterator(); it.hasNext();) {
<a name="513" href="#513">513</a>                 ((<a href="../../../../org/archive/crawler/settings/ValueErrorHandler.html">ValueErrorHandler</a>) it.next()).handleValueError(error);
<a name="514" href="#514">514</a>             }
<a name="515" href="#515">515</a>         }
<a name="516" href="#516">516</a>         <strong>return</strong> valueErrorHandlers.size() > 0;
<a name="517" href="#517">517</a>     }
<a name="518" href="#518">518</a> 
<a name="519" href="#519">519</a>     <em>/**<em>*</em></em>
<a name="520" href="#520">520</a> <em>     * Set the level for which notification of failed constraints will be fired.</em>
<a name="521" href="#521">521</a> <em>     *</em>
<a name="522" href="#522">522</a> <em>     * @param level the error reporting level.</em>
<a name="523" href="#523">523</a> <em>     */</em>
<a name="524" href="#524">524</a>     <strong>public</strong> <strong>void</strong> setErrorReportingLevel(Level level) {
<a name="525" href="#525">525</a>         errorReportingLevel = level.intValue();
<a name="526" href="#526">526</a>     }
<a name="527" href="#527">527</a> 
<a name="528" href="#528">528</a>     <em>/**<em>*</em></em>
<a name="529" href="#529">529</a> <em>     * Creates and returns a &lt;tt>List&lt;/tt> of all files comprising the current</em>
<a name="530" href="#530">530</a> <em>     * settings framework.</em>
<a name="531" href="#531">531</a> <em>     *</em>
<a name="532" href="#532">532</a> <em>     * &lt;p>The List contains the absolute String path of each file.</em>
<a name="533" href="#533">533</a> <em>     *</em>
<a name="534" href="#534">534</a> <em>     * &lt;p>The list should contain any configurable files, including such files</em>
<a name="535" href="#535">535</a> <em>     * as seed file and any other files use by the various settings modules.</em>
<a name="536" href="#536">536</a> <em>     *</em>
<a name="537" href="#537">537</a> <em>     * &lt;p>Implementations of the SettingsHandler that do not use files for</em>
<a name="538" href="#538">538</a> <em>     * permanent storage should return an empty list.</em>
<a name="539" href="#539">539</a> <em>     * @return &lt;code>List&lt;/code> of framework files.</em>
<a name="540" href="#540">540</a> <em>     */</em>
<a name="541" href="#541">541</a>     <strong>public</strong> <strong>abstract</strong> List getListOfAllFiles();
<a name="542" href="#542">542</a>     
<a name="543" href="#543">543</a>     <em>/**<em>*</em></em>
<a name="544" href="#544">544</a> <em>     * Clear any per-host settings cached in memory; allows editting of </em>
<a name="545" href="#545">545</a> <em>     * per-host settings files on disk, perhaps in bulk/automated fashion,</em>
<a name="546" href="#546">546</a> <em>     * to take effect in running crawl. </em>
<a name="547" href="#547">547</a> <em>     */</em>
<a name="548" href="#548">548</a>     <strong>public</strong> <strong>void</strong> clearPerHostSettingsCache() {
<a name="549" href="#549">549</a>         settingsCache.clear();
<a name="550" href="#550">550</a>     }
<a name="551" href="#551">551</a> }
</pre>
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