static Charset getCharsetByLabel(String label) {
        if (label == null) {
            return null;
        }
        synchronized (charsetsByLabel) {
            // Lazy initialization
            if (charsetsByLabel.isEmpty()) {
                addAll();
            }
        }
        label = label.trim().toLowerCase(Locale.US);
        return charsetsByLabel.get(label);
    }
@param label a charset name
@return the corresponding java charset, if there is one. Otherwise, null
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/charsetdetector/CharsetAliases.java