public boolean consume()

in http2/src/main/java/org/apache/mina/http2/impl/Http2PushPromiseFrameDecoder.java [66:105]
40 lines of code
12 McCabe index (conditional complexity)

    public boolean consume(ByteBuffer buffer) {
        while ((getValue() == null) && buffer.remaining() > 0) {
            switch (state) {
            case PAD_LENGTH:
                padLength = buffer.get();
                state = State.PROMISED_STREAM;
                decoder = new IntPartialDecoder(4);
                break;
            case PROMISED_STREAM:
                if (decoder.consume(buffer)) {
                    builder.promisedStreamID(((IntPartialDecoder)decoder).getValue() & HTTP2_31BITS_MASK);
                    state = State.HEADER;
                    int headerLength = getHeader().getLength() - 4;
                    if (isFlagSet(FLAGS_PADDING)) {
                        headerLength -= (padLength + 1);
                    }
                    decoder = new BytePartialDecoder(headerLength);
                }
                break;
            case HEADER:
                if (decoder.consume(buffer)) {
                    builder.headerBlockFragment(((BytePartialDecoder)decoder).getValue());
                    if (isFlagSet(FLAGS_PADDING)) {
                      state = State.PADDING;
                      decoder = new BytePartialDecoder(padLength);
                    } else {
                        setValue(builder.build());
                    }
                }
                break;
            case PADDING:
                if (decoder.consume(buffer)) {
                    builder.padding(((BytePartialDecoder)decoder).getValue());
                    setValue(builder.build());
                }
                break;
            }
        }
        return getValue() != null;
    }