public void service()

in src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java [121:207]
75 lines of code
17 McCabe index (conditional complexity)

  public void service(HttpServletRequest req, HttpServletResponse res) throws IOException {
    try {
      validateRequestMethod(req);

      ResourceKey key = ResourceKey.fromPath(getEncodedPath(req));
      ProjectState state = getProject(key);
      XDocProjectConfig cfg = cfgFactory.create(state);

      if (key.file == null) {
        res.sendRedirect(getRedirectUrl(req, key, cfg));
        return;
      }

      MimeType mimeType = fileTypeRegistry.getMimeType(key.file, (byte[]) null);
      mimeType =
          new MimeType(
              FileContentUtil.resolveContentType(
                  state, key.file, FileMode.FILE, mimeType.toString()));
      FormatterProvider formatter = getFormatter(req, key, mimeType);
      validateDiffMode(key);

      ProjectControl projectControl = projectControlFactory.controlFor(key.project);
      String rev =
          getRevision(
              key.diffMode == DiffMode.NO_DIFF
                  ? MoreObjects.firstNonNull(key.revision, cfg.getIndexRef())
                  : key.revision,
              projectControl);
      String revB = getRevision(key.revisionB, projectControl);

      try (Repository repo = repoManager.openRepository(key.project)) {
        ObjectId revId =
            resolveRevision(
                repo,
                key.diffMode == DiffMode.NO_DIFF
                    ? MoreObjects.firstNonNull(rev, Constants.HEAD)
                    : rev);
        if (revId != null && ObjectId.isId(rev)) {
          validateCanReadCommit(repo, projectControl, revId);
        }

        ObjectId revIdB = resolveRevision(repo, revB);
        if (revIdB != null && ObjectId.isId(revB)) {
          validateCanReadCommit(repo, projectControl, revIdB);
        }

        if (isResourceNotModified(req, key, revId, revIdB)) {
          res.sendError(SC_NOT_MODIFIED);
          return;
        }

        Resource rsc;
        if (formatter != null) {
          rsc = docCache.get(formatter, key.project, key.file, revId, revIdB, key.diffMode);
        } else if (isImage(mimeType)) {
          rsc = getImageResource(repo, key.diffMode, revId, revIdB, key.file);
        } else {
          rsc = Resource.NOT_FOUND;
        }

        if (rsc != Resource.NOT_FOUND) {
          res.setHeader(
              HttpHeaders.ETAG, computeETag(key.project, revId, key.file, revIdB, key.diffMode));
        }
        if (key.diffMode == DiffMode.NO_DIFF && rev == null) {
          // file was loaded from HEAD, since HEAD is modifiable the document
          // should only be cached for a short period
          CacheHeaders.setCacheablePrivate(res, 15, TimeUnit.MINUTES, false);
        } else {
          CacheHeaders.setCacheablePrivate(res, 7, TimeUnit.DAYS, false);
        }
        rsc.send(req, res);
        return;
      }
    } catch (RepositoryNotFoundException
        | NoSuchProjectException
        | ResourceNotFoundException
        | AuthException
        | RevisionSyntaxException e) {
      Resource.NOT_FOUND.send(req, res);
    } catch (MethodNotAllowedException e) {
      CacheHeaders.setNotCacheable(res);
      res.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
    } catch (PermissionBackendException e) {
      //
    }
  }