import static org.codelibs.fess.app.web.admin.log.AdminLogAction.getLogFileItems;
import static org.codelibs.fess.app.web.admin.log.AdminLogAction.isLogFilename;

import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Base64;
import java.util.List;
import java.util.Map;

import org.codelibs.core.lang.StringUtil;