public Integer decode()

in codec/src/main/java/org/apache/mina/codec/delimited/ints/VarInt.java [115:152]

• 34 lines of code
• 7 McCabe index (conditional complexity)

        public Integer decode(IoBuffer input) {
            int origpos = input.position();

            try {
                byte tmp = input.get();
                if (tmp >= 0) {
                    return (int) tmp;
                }
                int result = tmp & 0x7f;
                if ((tmp = input.get()) >= 0) {
                    result |= tmp << 7;
                } else {
                    result |= (tmp & 0x7f) << 7;                    
                    if ((tmp = input.get()) >= 0) {
                        result |= tmp << 14;
                    } else {
                        result |= (tmp & 0x7f) << 14;               
                        if ((tmp = input.get()) >= 0) {
                            result |= tmp << 21;
                        } else {
                            result |= (tmp & 0x7f) << 21;
                            
                            // check that there are at most 3 significant bits available
                            if (((tmp = input.get()) & ~0x7) == 0) {
                                result |= tmp << 28;
                            } else {
                                throw new ProtocolDecoderException("Not the varint representation of a signed int32");
                            }
                        }
                    }
                }
                return result;

            } catch (BufferUnderflowException bue) {
                input.position(origpos);
            }
            return null;
        }