public void doFilter()

in commons-jcs3-jcache-extras/src/main/java/org/apache/commons/jcs3/jcache/extras/web/JCacheFilter.java [115:212]
92 lines of code
18 McCabe index (conditional complexity)

    public void doFilter(final ServletRequest servletRequest, final ServletResponse servletResponse, final FilterChain filterChain) throws IOException, ServletException
    {
        boolean gzip = false;
        if (HttpServletRequest.class.isInstance(servletRequest))
        {
            final Enumeration<String> acceptEncoding = HttpServletRequest.class.cast(servletRequest).getHeaders("Accept-Encoding");
            while (acceptEncoding != null && acceptEncoding.hasMoreElements())
            {
                if ("gzip".equals(acceptEncoding.nextElement()))
                {
                    gzip = true;
                    break;
                }
            }
        }

        final HttpServletResponse httpServletResponse = HttpServletResponse.class.cast(servletResponse);
        checkResponse(httpServletResponse);

        final PageKey key = new PageKey(key(servletRequest), gzip);
        Page page = cache.get(key);
        if (page == null)
        {
            final ByteArrayOutputStream baos = new ByteArrayOutputStream();
            final InMemoryResponse response;
            if (gzip)
            {
                response = new InMemoryResponse(httpServletResponse, new GZIPOutputStream(baos));
            }
            else
            {
                response = new InMemoryResponse(httpServletResponse, baos);
            }
            filterChain.doFilter(servletRequest, response);
            response.flushBuffer();

            page = new Page(
                    response.getStatus(),
                    response.getContentType(),
                    response.getContentLength(),
                    response.getCookies(),
                    response.getHeaders(),
                    baos.toByteArray());
            cache.put(key, page);
        }

        if (page.status == SC_OK) {
            checkResponse(httpServletResponse);

            if (gzip)
            {
                httpServletResponse.setHeader("Content-Encoding", "gzip");
            }

            httpServletResponse.setStatus(page.status);
            if (page.contentType != null)
            {
                httpServletResponse.setContentType(page.contentType);
            }
            if (page.contentLength > 0)
            {
                httpServletResponse.setContentLength(page.contentLength);
            }
            for (final Cookie c : page.cookies)
            {
                httpServletResponse.addCookie(c);
            }
            for (final Map.Entry<String, List<Serializable>> entry : page.headers.entrySet())
            {
                for (final Serializable value : entry.getValue())
                {
                    if (Integer.class.isInstance(value))
                    {
                        httpServletResponse.addIntHeader(entry.getKey(), Integer.class.cast(value));
                    }
                    else if (String.class.isInstance(value))
                    {
                        httpServletResponse.addHeader(entry.getKey(), String.class.cast(value));
                    }
                    else if (Long.class.isInstance(value))
                    {
                        httpServletResponse.addDateHeader(entry.getKey(), Long.class.cast(value));
                    }
                }
            }
            httpServletResponse.setContentLength(page.out.length);
            final BufferedOutputStream bos = new BufferedOutputStream(httpServletResponse.getOutputStream());
            if (page.out.length != 0)
            {
                bos.write(page.out);
            }
            else
            {
                bos.write(new byte[0]);
            }
            bos.flush();
        }
    }