SocksVersion Type — netty Architecture

Source Code

codec-socks/src/main/java/io/netty/handler/codec/socksx/SocksVersion.java lines 22–64

public enum SocksVersion {
    /**
     * SOCKS protocol version 4a (or 4)
     */
    SOCKS4a((byte) 0x04),
    /**
     * SOCKS protocol version 5
     */
    SOCKS5((byte) 0x05),
    /**
     * Unknown protocol version
     */
    UNKNOWN((byte) 0xff);

    /**
     * Returns the {@link SocksVersion} that corresponds to the specified version field value,
     * as defined in the protocol specification.
     *
     * @return {@link #UNKNOWN} if the specified value does not represent a known SOCKS protocol version
     */
    public static SocksVersion valueOf(byte b) {
        if (b == SOCKS4a.byteValue()) {
            return SOCKS4a;
        }
        if (b == SOCKS5.byteValue()) {
            return SOCKS5;
        }
        return UNKNOWN;
    }

    private final byte b;

    SocksVersion(byte b) {
        this.b = b;
    }

    /**
     * Returns the value of the version field, as defined in the protocol specification.
     */
    public byte byteValue() {
        return b;
    }
}