**Test Count**: 8 tests

**Key Scenarios**:
- ✅ Successful extraction closes resources properly
- ✅ Failed extraction includes descriptive error messages
- ✅ Null input stream validation
- ✅ Error messages include file type context

---

### 2. FilenameExtractorEnhancedTest.java
**Purpose**: Test FilenameExtractor edge cases and new documentation.

**Key Test Areas**:
- Parameter handling (null, empty, missing)

        RenderDataUtil.register(data, "duplicateHostItems", duplicateHostService.getDuplicateHostList(duplicateHostPager)); // page navi

        // restore from pager
        copyBeanToBean(duplicateHostPager, form, op -> op.include("regularName", "duplicateHostName"));
    }

    // ===================================================================================

                        logger.debug("Path {} matches the include/exclude path expression {} on {} of label.", path, excludedPaths, value);
                    }
                    return false;
                }
                if (logger.isDebugEnabled()) {
                    logger.debug("Path {} matches the include path expression {} on {} of label.", path, excludedPaths, value);
                }

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE components PUBLIC "-//DBFLUTE//DTD LastaDi 1.0//EN"
	"http://dbflute.org/meta/lastadi10.dtd">
<components namespace="fessCrawler">
	<include path="crawler/transformer_basic.xml"/>

	<component name="fessXpathTransformer" class="org.codelibs.fess.crawler.transformer.FessXpathTransformer" instance="singleton">
		<property name="name">"fessXpathTransformer"</property>

     * The value of the label type (alphanumeric and underscore only).
     */
    @Required
    @Size(max = 100)
    @Pattern(regexp = "^[a-zA-Z0-9_]+$")
    public String value;

    /**
     * The paths to include for this label type.
     */
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String includedPaths;

    /**
     * The paths to exclude for this label type.
     */

        RenderDataUtil.register(data, "searchLogItems", searchLogService.getSearchLogList(searchLogPager)); // page navi

        // restore from pager
        copyBeanToBean(searchLogPager, form, op -> op.include(CONDITION_FIELDS));
    }

    // ===================================================================================
    //                                                                        Edit Execute

     */
    private CharUtil() {
    }

    /**
     * Checks if the given character is a valid URL character.
     *
     * Valid URL characters include:
     * - Lowercase letters (a-z)
     * - Uppercase letters (A-Z)
     * - Digits (0-9)
     * - Special characters: . - * _ : / + % = & ? # [ ] @ ~ ! $ ' ( ) , ;
     *
     * @param c the character to check

        return processRequest(uri, true);
    }

    /**
     * Processes a request for the given URI.
     *
     * @param uri the URI to process
     * @param includeContent whether to include content in the response
     * @return the response data
     * @throws CrawlingAccessException if the request fails
     */
    protected ResponseData processRequest(final String uri, final boolean includeContent) {

 * <li>TOKEN_PARAMTERS - The parameters to include in the token request.</li>
 * <li>LOGIN_METHOD - The HTTP method to use for the login request (GET or POST).</li>
 * <li>LOGIN_URL - The URL to send the login request to.</li>
 * <li>LOGIN_PARAMETERS - The parameters to include in the login request.</li>
 * </ul>
 *
 */
public class FormScheme implements AuthScheme {

        RenderDataUtil.register(data, "keyMatchItems", keyMatchService.getKeyMatchList(keyMatchPager)); // page navi

        // restore from pager
        copyBeanToBean(keyMatchPager, form, op -> op.include("term", "query"));
    }

    // ===================================================================================
    //                                                                        Edit Execute