}

    @Override
    public boolean generate(final String thumbnailId, final File outputFile) {
        if (logger.isDebugEnabled()) {
            logger.debug("Generate Thumbnail: {}", thumbnailId);
        }

        if (outputFile.exists()) {
            if (logger.isDebugEnabled()) {
                logger.debug("The thumbnail file exists: {}", outputFile.getAbsolutePath());
            }
            return true;

        }

        if (logger.isDebugEnabled()) {
            logger.debug("Thumbnail Directory: {}", baseDir.getAbsolutePath());
        }

        thumbnailTaskQueue = new LinkedBlockingQueue<>(thumbnailTaskQueueSize);
        generating = !Constants.TRUE.equalsIgnoreCase(System.getProperty("fess.thumbnail.process"));
        thumbnailQueueThread = new Thread((Runnable) () -> {

	<property name="crawler.dir" value="${basedir}/src/main/webapp/WEB-INF/env/crawler" />
	<property name="suggest.dir" value="${basedir}/src/main/webapp/WEB-INF/env/suggest" />
	<property name="thumbnail.dir" value="${basedir}/src/main/webapp/WEB-INF/env/thumbnail" />
	<property name="site.dir" value="${basedir}/src/main/webapp/WEB-INF/site" />
	<property name="kopf.branch" value="fess-14" />

	<!-- Maven Repository -->

/src/main/webapp/WEB-INF/site/
/src/main/webapp/WEB-INF/plugin/*
!/src/main/webapp/WEB-INF/plugin/.keep
/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

searchlog.request.headers=
searchlog.process.batch_size=100

thumbnail.html.image.min.width=100
thumbnail.html.image.min.height=100
thumbnail.html.image.max.aspect.ratio=3.0
thumbnail.html.image.thumbnail.width=100
thumbnail.html.image.thumbnail.height=100
thumbnail.html.image.format=png
thumbnail.html.image.xpath=//IMG
thumbnail.html.image.exclude.extensions=svg,html,css,js
thumbnail.generator.interval=0
thumbnail.generator.targets=all

    String THUMBNAIL_HTML_IMAGE_THUMBNAIL_WIDTH = "thumbnail.html.image.thumbnail.width";

    /** The key of the configuration. e.g. 100 */
    String THUMBNAIL_HTML_IMAGE_THUMBNAIL_HEIGHT = "thumbnail.html.image.thumbnail.height";

    /** The key of the configuration. e.g. png */
    String THUMBNAIL_HTML_IMAGE_FORMAT = "thumbnail.html.image.format";

    /** The key of the configuration. e.g. //IMG */

        if (StringUtil.isNotBlank(confPath)) {
            buf.append(confPath);
            buf.append(cpSeparator);
        }
        // WEB-INF/env/thumbnail/resources
        buf.append("WEB-INF");
        buf.append(File.separator);
        buf.append("env");
        buf.append(File.separator);
        buf.append(getExecuteType());
        buf.append(File.separator);

    public enum ArtifactType {
        DATA_STORE("fess-ds"), //
        THEME("fess-theme"), //
        INGEST("fess-ingest"), //
        SCRIPT("fess-script"), //
        WEBAPP("fess-webapp"), //
        THUMBNAIL("fess-thumbnail"), //
        CRAWLER("fess-crawler"), //
        UNKNOWN("jar");

        private final String id;

        ArtifactType(final String id) {
            this.id = id;
        }

    private static final String X_ROBOTS_TAG = "X-Robots-Tag";

    private static final String META_NAME_THUMBNAIL_CONTENT = "//META[@name=\"thumbnail\" or @name=\"THUMBNAIL\"]/@content";

    private static final String META_PROPERTY_OGIMAGE_CONTENT = "//META[@property=\"og:image\"]/@content";

    public static final String RESULT_COLLAPSED_PROPERTY = "result.collapsed";

    public static final String LOGIN_LINK_ENALBED_PROPERTY = "login.link.enabled";

    public static final String THUMBNAIL_ENALBED_PROPERTY = "thumbnail.enabled";

    public static final String IGNORE_FAILURE_TYPE_PROPERTY = "failure.ignoretype";

    public static final String FAILURE_COUNT_THRESHOLD_PROPERTY = "failure.countthreshold";