import org.codelibs.core.stream.StreamUtil;
import org.codelibs.fess.exception.ThemeException;
import org.codelibs.fess.helper.PluginHelper.Artifact;
import org.codelibs.fess.helper.PluginHelper.ArtifactType;
import org.codelibs.fess.util.ResourceUtil;

/**
 * Helper class for managing theme installation and uninstallation.
 * Handles the extraction and deployment of theme files from JAR artifacts.
 */

     */
    protected List<String> loadDataStoreNameList() {
        final Set<String> nameSet = new HashSet<>();
        final File[] jarFiles = ResourceUtil.getPluginJarFiles(PluginHelper.ArtifactType.DATA_STORE.getId());
        if (jarFiles == null) {
            return nameSet.stream().sorted().collect(Collectors.toList());
        }
        for (final File jarFile : jarFiles) {