docs: public String getEscape(char ch) {
        if (ch == escapeCharacter)
          return escapeCharacter + "E" + escapeCharacter;
        else if (ch == fieldDelimiter)
          return escapeCharacter + "F" + escapeCharacter;
        else if (ch == componentDelimiter)
          return escapeCharacter + "S" + escapeCharacter;
        else if (ch == subComponentDelimiter)
          return escapeCharacter + "T" + escapeCharacter;
        else if (ch == repetitionDelimiter)
          return escapeCharacter + "R" + escapeCharacter;
        else
          return null;
        }