public static boolean isOs()

in src/main/java/org/apache/commons/exec/OS.java [232:305]
70 lines of code
37 McCabe index (conditional complexity)

    public static boolean isOs(final String family, final String name, final String arch, final String version) {
        boolean retValue = false;
        if (family != null || name != null || arch != null || version != null) {
            boolean isFamily = true;
            boolean isName = true;
            boolean isArch = true;
            boolean isVersion = true;
            if (family != null) {
                // Windows probing logic relies on the word 'windows' in the OS
                final boolean isWindows = OS_NAME.contains(FAMILY_WINDOWS);
                boolean is9x = false;
                boolean isNT = false;
                if (isWindows) {
                    // there are only four 9x platforms that we look for
                    is9x = OS_NAME.contains("95") || OS_NAME.contains("98") || OS_NAME.contains("me")
                    // Windows CE isn't really 9x, but crippled enough to
                    // be a muchness. Ant doesn't run on CE, anyway.
                            || OS_NAME.contains("ce");
                    isNT = !is9x;
                }
                switch (family) {
                case FAMILY_WINDOWS:
                    isFamily = isWindows;
                    break;
                case FAMILY_9X:
                    isFamily = isWindows && is9x;
                    break;
                case FAMILY_NT:
                    isFamily = isWindows && isNT;
                    break;
                case FAMILY_OS2:
                    isFamily = OS_NAME.contains(FAMILY_OS2);
                    break;
                case FAMILY_NETWARE:
                    isFamily = OS_NAME.contains(FAMILY_NETWARE);
                    break;
                case FAMILY_DOS:
                    isFamily = PATH_SEP.equals(";") && !isFamily(FAMILY_NETWARE);
                    break;
                case FAMILY_MAC:
                    isFamily = OS_NAME.contains(FAMILY_MAC) || OS_NAME.contains(DARWIN);
                    break;
                case FAMILY_TANDEM:
                    isFamily = OS_NAME.contains("nonstop_kernel");
                    break;
                case FAMILY_UNIX:
                    isFamily = PATH_SEP.equals(":") && !isFamily(FAMILY_VMS) && (!isFamily(FAMILY_MAC) || OS_NAME.endsWith("x") || OS_NAME.contains(DARWIN));
                    break;
                case FAMILY_ZOS:
                    isFamily = OS_NAME.contains(FAMILY_ZOS) || OS_NAME.contains("os/390");
                    break;
                case FAMILY_OS400:
                    isFamily = OS_NAME.contains(FAMILY_OS400);
                    break;
                case FAMILY_VMS:
                    isFamily = OS_NAME.contains(FAMILY_VMS);
                    break;
                default:
                    throw new IllegalArgumentException("Don\'t know how to detect OS family \"" + family + "\"");
                }
            }
            if (name != null) {
                isName = name.equals(OS_NAME);
            }
            if (arch != null) {
                isArch = arch.equals(OS_ARCH);
            }
            if (version != null) {
                isVersion = version.equals(OS_VERSION);
            }
            retValue = isFamily && isName && isArch && isVersion;
        }
        return retValue;
    }