* and handles potential exceptions during parsing.
 * The class also includes inner classes for handling XML sitemap and sitemap index parsing.
 */
public class SitemapsHelper {
    private static final Logger logger = LogManager.getLogger(SitemapsHelper.class);

    /** The size of the preload buffer for checking file format. */
    protected int preloadSize = 512;

    /** Enable validation of sitemap entries. */

        SitemapSet sitemapSet = new SitemapSet();
        sitemapSet.addSitemap(sitemap);

        when(crawlerContainer.getComponent("sitemapsHelper")).thenReturn(sitemapsHelper);
        try {
            when(sitemapsHelper.parse(any(InputStream.class))).thenReturn(sitemapSet);
        } catch (Exception e) {
            fail("Should not throw exception in test setup");
        }

        assertFalse(sitemapsHelper.isValidPriority("-0.1"));
        assertFalse(sitemapsHelper.isValidPriority("1.1"));
        assertFalse(sitemapsHelper.isValidPriority("abc"));

        // Valid changefreq
        assertTrue(sitemapsHelper.isValidChangefreq("always"));
        assertTrue(sitemapsHelper.isValidChangefreq("hourly"));
        assertTrue(sitemapsHelper.isValidChangefreq("daily"));

                .singleton("urlConvertHelper", UrlConvertHelper.class)
                .singleton("intervalController", DefaultIntervalController.class)
                .singleton("sitemapsHelper", SitemapsHelper.class)
                .singleton("logHelper", LogHelperImpl.class)
                .singleton("encodingHelper", EncodingHelper.class)
                .singleton("contentLengthHelper", ContentLengthHelper.class)

extractorFactory.addExtractor("text/html", tikaExtractor, 1);  // Fallback
```

### Helpers

**RobotsTxtHelper**: RFC 9309 parsing, user-agent matching, crawl-delay, sitemaps
**SitemapsHelper**: Sitemap XML parsing, index handling
**MimeTypeHelper**: MIME detection via Tika
**EncodingHelper**: Charset detection with BOM
**UrlConvertHelper**: URL normalization

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## Development Workflow