private void rotateKeys()

in sdk/communication/azure-communication-chat/src/main/java/com/azure/android/communication/chat/implementation/notifications/fcm/RegistrationKeyManager.java [164:229]
57 lines of code
12 McCabe index (conditional complexity)

    private void rotateKeys(String directoryPath, Context context) {
        int removed = 0;
        HashSet<Integer> set = new HashSet<>();
        HashSet<Integer> removedSet = new HashSet<>();
        try {
            Enumeration<String> aliases = keyStore.aliases();
            while (aliases.hasMoreElements()) {
                set.add(extractIndex(aliases.nextElement()));
            }
        } catch (KeyStoreException e) {
            throw clientLogger.logExceptionAsError(new RuntimeException("Failed iterate key-store", e));
        }
        Set<String> aliases = keyMetaDataStore.getAliases();
        for (String alias : aliases) {
            set.add(extractIndex(alias));
        }

        //Delete expired keys or inconsistent records
        for (int curIndex : set) {
            String cryptoKeyAlias = CRYPTO_KEY_PREFIX + curIndex;
            String authKeyAlias = AUTH_KEY_PREFIX + curIndex;
            Long insertionTime = getCreationTime(cryptoKeyAlias);
            if (insertionTime == null) {
                insertionTime = 0L;
            }
            long currentTime = System.currentTimeMillis();
            long diffInMinutes = (currentTime - insertionTime) / (60 * 1000);

            if (diffInMinutes > EXPIRATION_TIME_MINUTES || anyEntryMissed(cryptoKeyAlias, authKeyAlias)) {
                try {
                    deleteKeyFromFiles(cryptoKeyAlias, directoryPath);
                    deleteKeyFromFiles(authKeyAlias, directoryPath);
                    removedSet.add(curIndex);
                    removed++;
                } catch (Exception e) {
                    throw clientLogger.logExceptionAsError(new RuntimeException("Failed to delete entry from key-store with index: " + curIndex, e));
                }
            }
        }
        set.removeAll(removedSet);

        //Rotate to fill the empty entries. Move remained entries to lowest index
        int toIndex = 0;
        if (removed == 0) {
            return;
        }
        for (int fromIndex : set) {
            String fromCryptoAlias = CRYPTO_KEY_PREFIX + fromIndex;
            String fromAuthAlias = AUTH_KEY_PREFIX + fromIndex;

            //No need to move
            if (toIndex == fromIndex) {
                toIndex++;
                continue;
            }

            String toCryptoAlias = CRYPTO_KEY_PREFIX + toIndex;
            String toAuthAlias = AUTH_KEY_PREFIX + toIndex;
            moveAnEntry(fromCryptoAlias, toCryptoAlias, directoryPath, context);
            moveAnEntry(fromAuthAlias, toAuthAlias, directoryPath, context);

            deleteKeyFromFiles(fromCryptoAlias, directoryPath);
            deleteKeyFromFiles(fromAuthAlias, directoryPath);
            toIndex++;
        }
    }