.getOrDefault("os.arch", Os.OS_ARCH)
                .toLowerCase(Locale.ENGLISH);
        String actualOsVersion = context.getSystemProperties()
                .getOrDefault("os.version", Os.OS_VERSION)
                .toLowerCase(Locale.ENGLISH);

        if (active && os.getFamily() != null) {
            active = determineFamilyMatch(os.getFamily(), actualOsName);
        }

        String test = version;
        boolean reverse = false;

        if (test.startsWith("!")) {
            reverse = true;
            test = test.substring(1);
        }

        boolean result = Os.OS_VERSION.equals(test);

        if (reverse) {
            return !result;
        } else {
            return result;
        }
    }

    private boolean determineArchMatch(String arch) {

  JAVA_EXT_DIRS("java.ext.dirs"),

  /** Operating system name. */
  OS_NAME("os.name"),

  /** Operating system architecture. */
  OS_ARCH("os.arch"),

  /** Operating system version. */
  OS_VERSION("os.version"),

  /** File separator ("/" on UNIX). */
  FILE_SEPARATOR("file.separator"),

  /** Path separator (":" on UNIX). */
  PATH_SEPARATOR("path.separator"),

                .append(ls);
        version.append("OS name: \"")
                .append(Os.OS_NAME)
                .append("\", version: \"")
                .append(Os.OS_VERSION)
                .append("\", arch: \"")
                .append(Os.OS_ARCH)
                .append("\", family: \"")
                .append(Os.OS_FAMILY)
                .append('\"');

     * The OA architecture.
     */
    public static final String OS_ARCH = System.getProperty("os.arch").toLowerCase(Locale.ENGLISH);

    /**
     * The OS version.
     */
    public static final String OS_VERSION = System.getProperty("os.version").toLowerCase(Locale.ENGLISH);

    /**
     * OS Family
     */
    public static final String OS_FAMILY;

    /**

findAndReplaceUnless(String, String, String); } org/codehaus/plexus/util/Os.class package org.codehaus.plexus.util; public synchronized class Os { private static final String OS_NAME; private static final String OS_ARCH; private static final String OS_VERSION; private static final String PATH_SEP; private String family; private String name; private String version; private String arch; public void Os(); public void Os(String); public void setFamily(String); public void setName(String); public void setArch(String);...