private static List parseDNchainPattern()

in connectfeaturelauncher/src/main/java/org/osgi/framework/FrameworkUtil.java [1824:1886]
59 lines of code
16 McCabe index (conditional complexity)

		private static List<Object> parseDNchainPattern(String pattern) {
			if (pattern == null) {
				throw new IllegalArgumentException("The pattern must not be null.");
			}
			List<Object> parsed = new ArrayList<Object>();
			final int length = pattern.length();
			char c = ';'; // start with semi-colon to detect empty pattern
			for (int startIndex = skipSpaces(pattern, 0); startIndex < length;) {
				int cursor = startIndex;
				int endIndex = startIndex;
				out: for (boolean inQuote = false; cursor < length; cursor++) {
					c = pattern.charAt(cursor);
					switch (c) {
						case '"' :
							inQuote = !inQuote;
							break;
						case '\\' :
							cursor++; // skip the escaped char
							if (cursor == length) {
								throw new IllegalArgumentException("unterminated escape");
							}
							break;
						case ';' :
							if (!inQuote) {
								break out; // end of pattern
							}
							break;
					}
					if (c != ' ') { // ignore trailing whitespace
						endIndex = cursor + 1;
					}
				}
				parsed.add(pattern.substring(startIndex, endIndex));
				startIndex = skipSpaces(pattern, cursor + 1);
			}
			if (c == ';') { // last non-whitespace character was a semi-colon
				throw new IllegalArgumentException("empty pattern");
			}

			// Now we have parsed into a list of strings, lets make List of rdn
			// out of them
			for (int i = 0; i < parsed.size(); i++) {
				String dn = (String) parsed.get(i);
				if (dn.equals(STAR_WILDCARD) || dn.equals(MINUS_WILDCARD)) {
					continue;
				}
				List<Object> rdns = new ArrayList<Object>();
				if (dn.charAt(0) == '*') {
					int index = skipSpaces(dn, 1);
					if (dn.charAt(index) != ',') {
						throw new IllegalArgumentException("invalid wildcard prefix");
					}
					rdns.add(STAR_WILDCARD);
					dn = new X500Principal(dn.substring(index + 1)).getName(X500Principal.CANONICAL);
				} else {
					dn = new X500Principal(dn).getName(X500Principal.CANONICAL);
				}
				// Now dn is a nice CANONICAL DN
				parseDN(dn, rdns);
				parsed.set(i, rdns);
			}
			return parsed;
		}