protected int directoryNameLength = 5;

    /** List of generator names. */
    protected List<String> generatorList;

    /** Map of file paths for thumbnail generation. */
    protected Map<String, String> filePathMap = new HashMap<>();

    /** The name of this thumbnail generator. */
    protected String name;

    /** Maximum number of redirects to follow. */
    protected int maxRedirectCount = 10;

    }

    public void test_generate_withNullThumbnailId() {
        // Test generation with null thumbnail ID
        assertFalse(thumbnailGenerator.generate(null, tempOutputFile));
    }

    public void test_generate_withEmptyThumbnailId() {
        // Test generation with empty thumbnail ID
        assertFalse(thumbnailGenerator.generate("", tempOutputFile));
    }

    /**
     * Command-line options for the thumbnail generator.
     */
    protected static class Options {
        /**
         * Session ID for filtering thumbnail generation.
         */
        @Option(name = "-s", aliases = "--sessionId", metaVar = "sessionId", usage = "Session ID")
        protected String sessionId;

        /**
         * Name identifier for the thumbnail generation task.
         */

        Exception middleCause = new RuntimeException("Processing failed", innerCause);
        ThumbnailGenerationException exception = new ThumbnailGenerationException("Thumbnail generation error", middleCause);

        assertEquals("Thumbnail generation error", exception.getMessage());
        assertEquals(middleCause, exception.getCause());
        assertEquals("Processing failed", exception.getCause().getMessage());

        return null;
    }

    /**
     * Adds a thumbnail generator to the manager.
     *
     * @param generator the thumbnail generator to add
     */
    public void add(final ThumbnailGenerator generator) {
        if (generator.isAvailable()) {
            if (logger.isDebugEnabled()) {
                logger.debug("{} is available.", generator.getName());
            }
            generatorList.add(generator);

        return resultBuf.toString();

    }

    /**
     * Executes the thumbnail generator process.
     * Sets up the classpath, JVM options, and command line arguments
     * to launch the ThumbnailGenerator in a separate process.
     *
     * @throws JobProcessingException if the thumbnail generation process fails
     */
    protected void executeThumbnailGenerator() {

    /** List of command strings to execute for thumbnail generation. */
    protected List<String> commandList;

    /** Timeout for command execution in milliseconds. */
    protected long commandTimeout = 30 * 1000L;// 30sec

    /** Timeout for destroying processes in milliseconds. */
    protected long commandDestroyTimeout = 5 * 1000L;// 5sec

import org.codelibs.fess.util.DocumentUtil;

/**
 * HTML tag-based thumbnail generator that creates thumbnails from image content
 * referenced in HTML documents. This generator extracts images from HTML content
 * and processes them to create thumbnail images based on configured dimensions
 * and format settings.
 *
 * <p>The generator validates image MIME types, processes image data through

        return actionClass;
    }

    /**
     * Overrides fillInStackTrace to return null for performance optimization.
     * This prevents stack trace generation for this exception type.
     *
     * @return null to skip stack trace generation
     */
    @Override
    public synchronized Throwable fillInStackTrace() {
        return null;
    }

import java.util.Map;

import org.codelibs.core.misc.Tuple3;

/**
 * Interface for thumbnail generation implementations.
 * Provides methods for creating thumbnails from various document types.
 */
public interface ThumbnailGenerator {

    /**
     * Gets the name of this thumbnail generator.
     * @return The generator name.
     */
    String getName();

    /**