public boolean accept()

in core/src/main/java/org/apache/ftpserver/ipfilter/RemoteIpFilter.java [167:222]
56 lines of code
13 McCabe index (conditional complexity)

    public boolean accept(IoSession session) {
        InetAddress address = ((InetSocketAddress) session.getRemoteAddress())
                .getAddress();
        switch (type) {
        case ALLOW:
            for (Subnet subnet : this) {
                if (subnet.inSubnet(address)) {
                    if (LOGGER.isDebugEnabled()) {
                        LOGGER
                                .debug(
                                        "Allowing connection from {} because it matches with the whitelist subnet {}",
                                        address, subnet);
                    }
                    return true;
                }
            }
            if (LOGGER.isDebugEnabled()) {
                LOGGER
                        .debug(
                                "Denying connection from {} because it does not match any of the whitelist subnets",
                                address);
            }
            return false;
        case DENY:
            if (isEmpty()) {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER
                            .debug(
                                    "Allowing connection from {} because blacklist is empty",
                                    address);
                }
                return true;
            }
            for (Subnet subnet : this) {
                if (subnet.inSubnet(address)) {
                    if (LOGGER.isDebugEnabled()) {
                        LOGGER
                                .debug(
                                        "Denying connection from {} because it matches with the blacklist subnet {}",
                                        address, subnet);
                    }
                    return false;
                }
            }
            if (LOGGER.isDebugEnabled()) {
                LOGGER
                        .debug(
                                "Allowing connection from {} because it does not match any of the blacklist subnets",
                                address);
            }
            return true;
        default:
            throw new IllegalStateException("Unknown or unimplemented filter type: "
                    + type);
        }
    }