import com.google.common.collect.Lists;

public class ThumbnailManager {
    private static final String NOIMAGE_FILE_SUFFIX = ".txt";

    protected static final String THUMBNAILS_DIR_NAME = "thumbnails";

    private static final Logger logger = LogManager.getLogger(ThumbnailManager.class);

    protected File baseDir;

    private final List<ThumbnailGenerator> generatorList = new ArrayList<>();

    public String execute() {
        try {
            final long count = ComponentUtil.getThumbnailManager().purge(getExpiry());
            return "Deleted " + count + " thumbnail files.";
        } catch (final Exception e) {
            logger.error("Failed to purge thumbnails.", e);
            return e.getMessage();
        }
    }

    public long getExpiry() {
        return expiry;
    }

/src/main/webapp/WEB-INF/lib/
/src/main/webapp/WEB-INF/site/
/src/main/webapp/WEB-INF/plugin/
/src/main/webapp/WEB-INF/env/crawler/lib/
/src/main/webapp/WEB-INF/env/suggest/lib/
/src/main/webapp/WEB-INF/env/thumbnail/lib/
/src/main/webapp/WEB-INF/thumbnails/
/src/main/webapp/jar/
/dbflute_fess/extlib/*
/dbflute_fess/log/*.log
/dbflute_h2/log/*.log
/dbflute_mysql/log/*.log
/dbflute_oracle/log/*.log
/src/main/webapp/WEB-INF/conf/*.properties

            final int totalCount = process(options);
            if (totalCount != 0) {
                logger.info("Created {} thumbnail files.", totalCount);
            } else {
                logger.info("No new thumbnails found.");
            }
            exitCode = 0;
        } catch (final ContainerNotAvailableException e) {
            if (logger.isDebugEnabled()) {

        }

        final TimeoutTask timeoutTask = createTimeoutTask();
        try {
            executeThumbnailGenerator();
        } catch (final Exception e) {
            logger.warn("Failed to generate thumbnails.", e);
            resultBuf.append(e.getMessage()).append("\n");
        } finally {
            if (timeoutTask != null && !timeoutTask.isCanceled()) {
                timeoutTask.cancel();
            }
        }

        return getPath("WEB-INF/", "dict", names);
    }

    public static Path getThumbnailPath(final String... names) {
        return getPath("WEB-INF/", "thumbnails", names);
    }

    public static Path getSitePath(final String... names) {
        return getPath("WEB-INF/", "site", names);
    }

    public static Path getPluginPath(final String... names) {

  check_command convert
  check_command pdftoppm
  check_command unoconv
  tmp_pdf_file=/tmp/thumbnail.$$.pdf
  unoconv -e PageRange=1-1 -o ${tmp_pdf_file} -f pdf "${target_file}"
  if [[ ! -f ${tmp_pdf_file} ]] ; then
    echo "unoconv does not work."
    exit 1
  fi
  tmp_png_prefix=/tmp/thumbnail.png.$$
  pdftoppm -png -singlefile ${tmp_pdf_file} ${tmp_png_prefix}
  tmp_png_file="${tmp_png_prefix}.png"

	<component name="msofficeThumbnailGenerator" class="org.codelibs.fess.thumbnail.impl.CommandGenerator">
		<property name="name">"msofficeThumbnailGenerator"</property>
		<property name="commandList">
			["${path}/generate-thumbnail",
			"msoffice",
			"${url}",
			"${outputFile}"]
		</property>
		<property name="generatorList">
			["${path}/generate-thumbnail"]
		</property>
		<postConstruct name="addCondition">

{
    "properties": {
      "thumbnail_id": {
        "type": "keyword"
      },
      "path": {
        "type": "keyword"
      },
      "generator": {
        "type": "keyword"
      },
      "target": {
        "type": "keyword"
      },
      "createdTime": {
        "type": "long"
      },
      "createdBy": {
        "type": "keyword"
      }
    }

                    }
                    break;
                default:
                    logger.error("Unknown thumbnail result: {} -> {}", thumbnailId, responseData.getUrl());
                    break;
                }
            } catch (final Throwable t) {