private Servlet getServletInternal()

in src/main/java/org/apache/sling/servlets/resolver/internal/SlingServletResolver.java [540:596]
51 lines of code
14 McCabe index (conditional complexity)

    private Servlet getServletInternal(
            final AbstractResourceCollector locationUtil,
            final SlingJakartaHttpServletRequest request,
            final ResourceResolver resolver) {
        // use local variable to avoid race condition with activate
        final ResolutionCache localCache = this.resolutionCache;
        final Servlet scriptServlet = localCache.get(locationUtil);
        if (scriptServlet != null) {
            if (LOGGER.isDebugEnabled()) {
                LOGGER.debug("Using cached servlet {}", RequestUtil.getServletName(scriptServlet));
            }
            return scriptServlet;
        }

        final Collection<Resource> candidates =
                locationUtil.getServlets(resolver, localCache.getScriptEngineExtensions());

        if (LOGGER.isDebugEnabled()) {
            if (candidates.isEmpty()) {
                LOGGER.debug("No servlet candidates found");
            } else {
                LOGGER.debug("Ordered list of servlet candidates follows");
                for (Resource candidateResource : candidates) {
                    LOGGER.debug("Servlet candidate: {}", candidateResource.getPath());
                }
            }
        }

        boolean hasOptingServlet = false;
        for (final Resource candidateResource : candidates) {
            LOGGER.debug(
                    "Checking if candidate resource {} adapts to servlet and accepts request",
                    candidateResource.getPath());
            Servlet candidate = this.getServlet(candidateResource);
            if (candidate != null) {
                final boolean isOptingServlet = candidate instanceof JakartaOptingServlet;
                boolean servletAcceptsRequest =
                        !isOptingServlet || (request != null && ((JakartaOptingServlet) candidate).accepts(request));
                if (servletAcceptsRequest) {
                    if (!hasOptingServlet && !isOptingServlet) {
                        localCache.put(locationUtil, candidate);
                    }
                    LOGGER.debug("Using servlet provided by candidate resource {}", candidateResource.getPath());
                    return candidate;
                }
                if (isOptingServlet) {
                    hasOptingServlet = true;
                }
                LOGGER.debug("Candidate {} does not accept request, ignored", candidateResource.getPath());
            } else {
                LOGGER.debug("Candidate {} does not adapt to a servlet, ignored", candidateResource.getPath());
            }
        }

        // exhausted all candidates, we don't have a servlet
        return null;
    }