protected T maybeDoAuthorizableWork()

in src/main/java/org/apache/sling/jackrabbit/usermanager/impl/resource/AuthorizableResourceProvider.java [226:275]
47 lines of code
13 McCabe index (conditional complexity)

    protected <T> T maybeDoAuthorizableWork(@NotNull ResolveContext<Object> ctx, @NotNull String path, 
            @NotNull AuthorizableWorker<T> authorizableWorker, @Nullable PrincipalWorker<T> principalWorker) {
        T result = null;
        // the principalId should be the first segment after the prefix
        String suffix = null;
        if (path.startsWith(systemUserManagerUserPrefix)) {
            suffix = path.substring(systemUserManagerUserPrefix.length());
        } else if (path.startsWith(systemUserManagerGroupPrefix)) {
            suffix = path.substring(systemUserManagerGroupPrefix.length());
        }

        if (suffix != null) {
            String pid;
            String relPath;
            int firstSlash = suffix.indexOf('/');
            if (firstSlash == -1) {
                pid = suffix;
                relPath = null;
            } else {
                pid = suffix.substring(0, firstSlash);
                relPath = suffix.substring(firstSlash + 1);
            }
            Session session = ctx.getResourceResolver().adaptTo(Session.class);
            if (session != null) {
                try {
                    UserManager userManager = AccessControlUtil.getUserManager(session);
                    if (userManager != null) {
                        Authorizable authorizable = userManager.getAuthorizable(pid);
                        if (authorizable != null) {
                            result = authorizableWorker.doWork(authorizable, relPath);
                        } else if (principalWorker != null && relPath == null){
                            // SLING-11098 check for a principal that is not an authorizable like the everyone group
                            PrincipalManager principalManager = AccessControlUtil.getPrincipalManager(session);
                            if (principalManager != null) {
                                @Nullable
                                Principal principal = principalManager.getPrincipal(pid);
                                if (principal != null) {
                                    result = principalWorker.doWork(principal);
                                }
                            }
                        }
                    }
                } catch (RepositoryException re) {
                    throw new SlingException(
                        "Error looking up Authorizable for principal: " + pid, re);
                }
            }
        }
        return result;
    }