protected DecodingState finishDecode()

in common/src/main/java/org/apache/asyncweb/common/codec/HttpResponseDecodingState.java [163:261]
89 lines of code
14 McCabe index (conditional complexity)

        protected DecodingState finishDecode(List<Object> childProducts,
                ProtocolDecoderOutput out) throws Exception {
            Map<String, List<String>> headers = (Map<String, List<String>>) childProducts
                    .get(0);

            // Parse cookies
            List<String> cookies = headers.get(HttpHeaderConstants.KEY_SET_COOKIE);
            if (cookies != null && !cookies.isEmpty()) {
                for (String cookie : cookies) {
                    response.addCookie(parseCookie(cookie));
                }
            }
            response.setHeaders(headers);

            if (LOG.isDebugEnabled()) {
                LOG.debug("Decoded header: " + response.getHeaders());
            }

            // Select appropriate body decoding state.
            boolean isChunked = false;
            if (response.getProtocolVersion() == HttpVersion.HTTP_1_1) {
                LOG.debug("Request is HTTP 1/1. Checking for transfer coding");
                isChunked = isChunked(response);
            } else {
                LOG.debug("Request is not HTTP 1/1. Using content length");
            }
            DecodingState nextState;
            if (isChunked) {
                LOG.debug("Using chunked decoder for request");
                nextState = new ChunkedBodyDecodingState() {
                    @Override
                    protected DecodingState finishDecode(
                            List<Object> childProducts,
                            ProtocolDecoderOutput out) throws Exception {
                        if (childProducts.size() != 1) {
                            int chunkSize = 0;
                            for (Object product : childProducts) {
                                IoBuffer chunk = (IoBuffer) product;
                                chunkSize += chunk.remaining();
                            }

                            IoBuffer body = IoBuffer.allocate(chunkSize);
                            for (Object product : childProducts) {
                                IoBuffer chunk = (IoBuffer) product;
                                body.put(chunk);
                            }
                            body.flip();
                            response.setContent(body);
                        } else {
                            response.setContent((IoBuffer) childProducts.get(0));
                        }

                        out.write(response);
                        return null;
                    }
                };
            } else {
                int length = getContentLength(response);
                if (length > 0) {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug(
                                "Using fixed length decoder for request with " +
                                "length " + length);
                    }

                    // TODO max length limitation.
                    nextState = new FixedLengthDecodingState(length) {
                        @Override
                        protected DecodingState finishDecode(IoBuffer readData,
                                ProtocolDecoderOutput out) throws Exception {
                            response.setContent(readData);
                            out.write(response);
                            return null;
                        }
                    };
                } else if (length < 0) {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug(
                                "Using consume-to-disconnection decoder for " +
                                "request with unspecified length.");
                    }
                    // FIXME hard-coded max length.
                    nextState = new ConsumeToEndOfSessionDecodingState(1048576) {
                        @Override
                        protected DecodingState finishDecode(IoBuffer readData,
                                ProtocolDecoderOutput out) throws Exception {
                            response.setContent(readData);
                            out.write(response);
                            return null;
                        }
                    };
                } else {
                    LOG.debug("No entity body for this request");
                    out.write(response);
                    nextState = null;
                }
            }
            return nextState;
        }