/** * quote the identifier if it is a: * - doesn't start with a character, * - contains non-alphanumeric characters or * - is a reserved keyword * @param id * @return */ public static String quoteIdentifier(final String id) { if (id.isEmpty()) { return id; } if (isKeyword(id)) { return quoteString(id); } if (Character.isAlphabetic(id.charAt(0)) && ALPHANUM_MATCHER.matchesAllOf(id)) { return id; } // Special case if (NEWLINE_MATCHER.matchesAnyOf(id)) { return quoteUnicodeString(id); } return quoteString(id); }