private long readNumber()

in hugegraph-client/src/main/java/org/apache/hugegraph/serializer/direct/util/BytesBuffer.java [653:699]
45 lines of code
11 McCabe index (conditional complexity)

    private long readNumber(byte b) {
        E.checkArgument((b & 0x80) == 0,
                        "Not a number type with prefix byte '0x%s'",
                        Bytes.toHex(b));
        // Parse the kind from byte 0kkksxxx
        int kind = b >>> 4;
        boolean positive = (b & 0x08) > 0;
        long high3bits = b & 0x07;
        long value = high3bits << ((kind + 1) * 8);
        switch (kind) {
            case 0:
                value |= this.readUInt8();
                break;
            case 1:
                value |= this.readUInt16();
                break;
            case 2:
                value |= this.readUInt8() << 16 | this.readUInt16();
                break;
            case 3:
                value |= this.readUInt32();
                break;
            case 4:
                value |= (long) this.readUInt8() << 32 | this.readUInt32();
                break;
            case 5:
                value |= (long) this.readUInt16() << 32 | this.readUInt32();
                break;
            case 6:
                value |= (long) this.readUInt8() << 48 |
                         (long) this.readUInt16() << 32 |
                         this.readUInt32();
                break;
            case 7:
                assert high3bits == 0L;
                value |= this.readLong();
                break;
            default:
                throw new AssertionError("Invalid length of number: " + kind);
        }
        if (!positive && kind < 7) {
            // Restore the bits of the original negative number
            long mask = Long.MIN_VALUE >> (52 - kind * 8);
            value |= mask;
        }
        return value;
    }