private static int parseActions()

in framework/src/main/java/org/osgi/framework/PackagePermission.java [234:327]
72 lines of code
66 McCabe index (conditional complexity)

	private static int parseActions(String actions) {
		boolean seencomma = false;

		int mask = ACTION_NONE;

		if (actions == null) {
			return mask;
		}

		char[] a = actions.toCharArray();

		int i = a.length - 1;
		if (i < 0)
			return mask;

		while (i != -1) {
			char c;

			// skip whitespace
			while ((i != -1) && ((c = a[i]) == ' ' || c == '\r' || c == '\n' || c == '\f' || c == '\t'))
				i--;

			// check for the known strings
			int matchlen;

			if (i >= 5 && (a[i - 5] == 'i' || a[i - 5] == 'I')
					&& (a[i - 4] == 'm' || a[i - 4] == 'M')
					&& (a[i - 3] == 'p' || a[i - 3] == 'P')
					&& (a[i - 2] == 'o' || a[i - 2] == 'O')
					&& (a[i - 1] == 'r' || a[i - 1] == 'R')
					&& (a[i] == 't' || a[i] == 'T')) {
				matchlen = 6;
				mask |= ACTION_IMPORT;

			} else
				if (i >= 5 && (a[i - 5] == 'e' || a[i - 5] == 'E')
						&& (a[i - 4] == 'x' || a[i - 4] == 'X')
						&& (a[i - 3] == 'p' || a[i - 3] == 'P')
						&& (a[i - 2] == 'o' || a[i - 2] == 'O')
						&& (a[i - 1] == 'r' || a[i - 1] == 'R')
						&& (a[i] == 't' || a[i] == 'T')) {
					matchlen = 6;
					mask |= ACTION_EXPORT | ACTION_IMPORT;

				} else {
					if (i >= 9 && (a[i - 9] == 'e' || a[i - 9] == 'E')
							&& (a[i - 8] == 'x' || a[i - 8] == 'X')
							&& (a[i - 7] == 'p' || a[i - 7] == 'P')
							&& (a[i - 6] == 'o' || a[i - 6] == 'O')
							&& (a[i - 5] == 'r' || a[i - 5] == 'R')
							&& (a[i - 4] == 't' || a[i - 4] == 'T')
							&& (a[i - 3] == 'o' || a[i - 3] == 'O')
							&& (a[i - 2] == 'n' || a[i - 2] == 'N')
							&& (a[i - 1] == 'l' || a[i - 1] == 'L')
							&& (a[i] == 'y' || a[i] == 'Y')) {
						matchlen = 10;
						mask |= ACTION_EXPORT;

					} else {
						// parse error
						throw new IllegalArgumentException("invalid permission: " + actions);
					}
				}

			// make sure we didn't just match the tail of a word
			// like "ackbarfimport". Also, skip to the comma.
			seencomma = false;
			while (i >= matchlen && !seencomma) {
				switch (a[i - matchlen]) {
					case ',' :
						seencomma = true;
						/* FALLTHROUGH */
					case ' ' :
					case '\r' :
					case '\n' :
					case '\f' :
					case '\t' :
						break;
					default :
						throw new IllegalArgumentException("invalid permission: " + actions);
				}
				i--;
			}

			// point i at the location of the comma minus one (or -1).
			i -= matchlen;
		}

		if (seencomma) {
			throw new IllegalArgumentException("invalid permission: " + actions);
		}

		return mask;
	}