CharsetMatch match(CharsetDetector det) {
                int confidence = match(det, commonChars);
                return confidence == 0 ? null : new CharsetMatch(det, this, confidence);
            }
The charset recognize for EUC-JP.  A singleton instance of this class
is created and kept by the public CharsetDetector class
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-text-module/src/main/java/org/apache/tika/parser/txt/CharsetRecog_mbcs.java