static public DataCoding parse()

in ch-commons-gsm/src/main/java/com/cloudhopper/commons/gsm/DataCoding.java [343:418]
45 lines of code
12 McCabe index (conditional complexity)

    static public DataCoding parse(byte dcs) {
        try {
            // if bits 7 thru 4 are all off, this represents a simple character encoding group
            if ((dcs & (byte)0xF0) == 0x00) {
                // the raw dcs value is exactly our 16 possible languaged
                return createCharacterEncodingGroup(dcs);

            // if bits 7 thru 4 are all on, this represents a message class group
            } else if ((dcs & (byte)0xF0) == (byte)0xF0) {
                // bit 2 is the language encoding
                byte characterEncoding = CHAR_ENC_DEFAULT;
                if ((dcs & (byte)0x04) == (byte)0x04) {
                    characterEncoding = CHAR_ENC_8BIT;
                }

                // bits 1 thru 0 is the message class
                byte messageClass = (byte)(dcs & (byte)0x03);

                return createMessageClassGroup(characterEncoding, messageClass);

            // at this point if bits 7 and 6 are off, then general data coding group
            } else if ((dcs & (byte)0xC0) == (byte)0x00) {
                // bit 5 represents "compression"
                boolean compressed = false;
                if ((dcs & (byte)0x20) == (byte)0x20) {
                    compressed = true;
                }

                // bits 1 thru 0 is the message class
                byte tempMessageClass = (byte)(dcs & (byte)0x03);

                Byte messageClass = null;
                // bit 4 on means the message class becomes used
                if ((dcs & (byte)0x10) == (byte)0x10) {
                    messageClass = new Byte(tempMessageClass);
                }

                // bits 3 and 2 represent the language encodings (nicely match default, 8-bit, or UCS2)
                byte characterEncoding = (byte)(dcs & (byte)0x0C);

                return createGeneralGroup(characterEncoding, messageClass, compressed);

            // at this point if bits 7 and 6 are on, then bits 5 and 4 determine MWI
            } else if ((dcs & (byte)0xC0) == (byte)0xC0) {
                // bit 5: 0=default, 1=UCS2
                byte characterEncoding = CHAR_ENC_DEFAULT;
                if ((byte)(dcs & (byte)0x20) == 0x20) {
                    characterEncoding = CHAR_ENC_UCS2;
                }

                // bit 4: 0=discard, 1=store
                boolean store = false;
                if ((byte)(dcs & (byte)0x10) == 0x10) {
                    store = true;
                }

                // bit 3: indicator active
                boolean indicatorActive = false;
                if ((byte)(dcs & (byte)0x08) == 0x08) {
                    indicatorActive = true;
                }

                // bit 2: means nothing

                // bit 1 thru 0 is the type of indicator
                byte indicatorType = (byte)(dcs & (byte)0x03);

                return createMessageWaitingIndicationGroup(characterEncoding, store, indicatorActive, indicatorType);

            } else {
                return createReservedGroup(dcs);
            }
        } catch (IllegalArgumentException e) {
            return createReservedGroup(dcs);
        }
    }