*
     * @param defaultEncoding the default encoding to set
     * @throws IllegalArgumentException if the default encoding is blank
     */
    public void setDefaultEncoding(final String defaultEncoding) {
        if (StringUtil.isBlank(defaultEncoding)) {
            throw new IllegalArgumentException("Default encoding must not be blank.");
        }

        return defaultEncoding;
    }

    /**
     * Sets the default character encoding.
     *
     * @param defaultEncoding the default encoding to set
     */
    public void setDefaultEncoding(final String defaultEncoding) {
        this.defaultEncoding = defaultEncoding;
    }

    /**
     * Gets the preload size for charset detection.
     *
     * @return the preload size in bytes