}

        final String newEnc = encodingMap.get(toLowerCase(enc));
        if (StringUtil.isBlank(newEnc)) {
            return enc;
        }
        return newEnc;
    }

    public void setDefaultEncoding(final String defaultEncoding) {
        this.defaultEncoding = defaultEncoding;
    }

    public void addEncodingMapping(final String source, final String target) {
        encodingMap.put(toLowerCase(source), target);