if (logger.isDebugEnabled()) {
            logger.debug("Create thumbnail task: {}", task);
        }
        return task;
    }

    public void setDirectoryNameLength(final int directoryNameLength) {
        this.directoryNameLength = directoryNameLength;
    }

    protected String expandPath(final String value) {
        if (value != null && filePathMap.containsKey(value)) {