Allow injection jar to be located in system_ext folder

        private static final String TAG_COMPONENT = "component";

        private static final String SYSTEM = "/system/";

        private static final String PRODUCT = "/product/";

        private static final String SYSTEM_EXT = "/system_ext/";

        private final Set<String> mComponentNames = new HashSet<>();

        private TelephonyComponentFactory mInjectedInstance;

        /**

         * @return paths correctly configured to inject.

         * 1) PackageName and JarPath mustn't be empty.

         * 2) JarPath is restricted under /system or /product only.

         * 2) JarPath is restricted under /system or /product or /system_ext only.

         * 3) JarPath is on a READ-ONLY partition.

         */

        private @Nullable String getValidatedPaths() {

            }

            // filter out invalid paths

            return Arrays.stream(mJarPath.split(File.pathSeparator))

                    .filter(s -> (s.startsWith(SYSTEM) || s.startsWith(PRODUCT)))

                    .filter(s -> (s.startsWith(SYSTEM) || s.startsWith(PRODUCT)

                            || s.startsWith(SYSTEM_EXT)))

                    .filter(s -> {

                        try {

                            // This will also throw an error if the target doesn't exist.