/** Cache for XPathAPI instances to improve performance. */
    protected LoadingCache<String, XPathAPI> xpathAPICache;

    /** Cache duration in minutes for XPathAPI instances. */
    protected long cacheDuration = 10; // min

    /**
     * Creates a new HtmlXpathExtractor instance.
     */
    public HtmlXpathExtractor() {
        super();
    }

    /**

    }

    /**
     * Creates a new RequestDataContext for building RequestData instances.
     *
     * @return a new RequestDataContext instance
     */
    public static RequestDataContext newRequestData() {
        return new RequestDataContext();
    }

    /**
     * Context class for building RequestData instances using a fluent API.
     */
    public static class RequestDataContext {

        assertNotNull(component1);
        assertNotNull(component2);

        // Should be same instance for singleton
        assertSame(component1, component2);
        // The first creation should increment the counter
        assertTrue("Instance count should be at least 1", SingletonTestComponent.getInstanceCount() >= 1);
    }

    /**
     * Test wrap method
     */

    public void test_memoryReferenceEquality() {
        // Enum instances are singletons
        CrawlerStatus status1 = CrawlerStatus.INITIALIZING;
        CrawlerStatus status2 = CrawlerStatus.INITIALIZING;

        // Should be the same instance
        assertSame(status1, status2);
        assertTrue(status1 == status2);

        // valueOf should return the same instance

<components namespace="fessCrawler">
    <component name="crawler" class="org.codelibs.fess.crawler.Crawler" instance="prototype"/>
    <component name="httpClient" class="org.codelibs.fess.crawler.client.http.HcHttpClient" instance="singleton"/>
    <component name="fileTransformer" class="org.codelibs.fess.crawler.transformer.impl.FileTransformer" instance="singleton"/>
</components>
```

### Crawler Context Configuration

```java

/**
 * RobotsTxtException is an exception class that represents an error related to robots.txt processing during web crawling.
 * It extends CrawlerSystemException and provides constructors to create instances with a message and/or a cause.
 *
 */
public class RobotsTxtException extends CrawlerSystemException {

    private static final long serialVersionUID = 1L;

    /**

        this.extractorMap = extractorMap;
    }

    /**
     * Creates a new ExtractorBuilder instance.
     *
     * @param in      The input stream to be processed by the extractor.
     * @param params  The parameters to be used by the extractor.
     * @return A new ExtractorBuilder instance.
     */
    public ExtractorBuilder builder(final InputStream in, final Map<String, String> params) {

     * @return This builder instance.
     */
    public SuggesterBuilder settings(final SuggestSettings settings) {
        this.settings = settings;
        settingsBuilder = null;
        return this;
    }

    /**
     * Sets the suggest settings builder.
     * @param settingsBuilder The suggest settings builder.
     * @return This builder instance.
     */

     * @return This builder instance.
     */
    public SuggestSettingsBuilder clusterTimeout(final String timeout) {
        timeoutSettings.clusterTimeout = timeout;
        return this;
    }

    /**
     * Builds a SuggestSettings instance.
     * @param client The OpenSearch client.
     * @param id The ID.
     * @return A SuggestSettings instance.
     */

import java.util.Queue;

/**
 * A chain of {@link ReadingConverter} implementations that applies each converter in sequence to generate possible reading variations of a given text.
 * It maintains a list of ReadingConverter instances and iterates through them, applying each converter to the input text and accumulating the results.
 * The chain stops processing when the maximum number of readings is reached.
 */